Language：Japanese  

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Language：Japanese   Publisher：電力土木技術協会  

CiNii Books

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Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

DOI： 10.1088/1755-1315/833/1/012151

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Other Link： https://iopscience.iop.org/article/10.1088/1755-1315/833/1/012151/pdf

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1007/s00603-020-02212-1

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Other Link： http://link.springer.com/article/10.1007/s00603-020-02212-1/fulltext.html

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

Displacement monitoring in open-pit mines is one of the important tasks for safe management of mining processes. Differential interferometric synthetic aperture radar (DInSAR), mounted on an artificial satellite, has the potential to be a cost-effective method for monitoring surface displacements over extensive areas, such as open-pit mines. DInSAR requires the ground surface elevation data in the process of its analysis as a digital elevation model (DEM). However, since the topography of the ground surface in open-pit mines changes largely due to excavations, measurement errors can occur due to insufficient information on the elevation of mining areas. In this paper, effect of different elevation models on the accuracy of the displacement monitoring results by DInSAR is investigated at a limestone quarry. In addition, validity of the DInSAR results using an appropriate DEM is examined by comparing them with the results obtained by global positioning system (GPS) monitoring conducted for three years at the same limestone quarry. It is found that the uncertainty of DEMs induces large errors in the displacement monitoring results if the baseline length of the satellites between the master and the slave data is longer than a few hundred meters. Comparing the monitoring results of DInSAR and GPS, the root mean square error (RMSE) of the discrepancy between the two sets of results is less than 10 mm if an appropriate DEM, considering the excavation processes, is used. It is proven that DInSAR can be applied for monitoring the displacements of mine slopes with centimeter-level accuracy. (C) 2020 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.

DOI： 10.1016/j.jrmge.2020.01.003

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

During the past 10 years, Timor-Leste has concentrated all its efforts on infrastructure development. However, it has not achieved enough due to unexpected ground deformation in mountainous areas that is seriously affecting road constructions, etc. In order to design roads and other infrastructure under such difficult conditions, it is important to know the present and future ground conditions. Continuous monitoring is a significant methods of detecting ground deformation and providing essential information to realize an effective design. The problem arises of “How can ground deformation be monitored in extensive areas, which are generally located in mountain areas that are difficult to access?” Differential Interferometry Synthetic Aperture Radar (DInSAR) has recently been applied to monitor displacement in extensive areas. In addition, Unmanned Aerial Vehicle (UAV) photogrammetry is useful for detecting the deformation in detail. Both methods are advantageous in that they do not require any sensors. Therefore, the combination of DInSAR and UAV photogrammetry is one of the solutions for monitoring the ground deformation in Timor-Leste. In this paper, DInSAR and UAV photogrammetry are applied to unstable ground in the Bobonaro region of Timor-Leste to find the recent ground deformation, since 2007, due to earthquakes and hard rainfall events. It is found that DInSAR is useful for screening usual and unusual ground behavior and that UAV photogrammetry is flexible to use and can detect displacements with cm accuracy after the DInSAR screening.

DOI： 10.3390/geosciences10060245

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Publishing type：Research paper (international conference proceedings)  

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Publishing type：Research paper (international conference proceedings)   Publisher：EDP Sciences  

Numerous cities around the world are facing the problem of land subsidence. In many cases, it is the excessive groundwater extraction to meet human needs that leads to this subsidence. Since land subsidence rates are very slow (a few centimeters per year), the subsidence usually remains unnoticed until it has progressed to the point of causing severe damage to buildings, houses, and/or other infrastructures. Therefore, it is very important to detect the presence of subsidence in advance. In this study, screening for the presence of land subsidence in the city of Denpasar, Bali, Indonesia is conducted. The Sentinel-1A/B SAR dataset, taken from October 2014 to June 2019, is processed using the SBAS DInSAR method. Subsidence is found in the districts of Denpasar Selatan, Denpasar Barat, and Kuta, which falls in the range of -100 mm to -200 mm in an area of about 93.03 ha. All the extracted points of interest show the subsidence having linear behavior. The spatio-temporal behavior of the subsidence in Denpasar is presented clearly. However, the mechanism and the deriving factors of the subsidence remain unclear. Therefore, further studies are needed.

DOI： 10.1051/e3sconf/202015302003

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Publishing type：Part of collection (book)   Publisher：Springer Singapore  

DOI： 10.1007/978-981-15-2184-3_157

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Association of Japanese Geographers  

<p>Heavy rain in northern part of Kyushu on July 5, 2017, caused the destruction and partial collapse of ponds in the city of Asakura, Fukuoka prefecture. Among those ponds, we selected 15 from the aerial photographs taken by the Geographical Survey Institute Authority of Japan （GSI） after the disaster and carried out a field survey. Moreover, we identified the ponds where changes in the ground surface occurred using the high-resolution surface change data observed before and after the disaster by the L-band synthetic aperture radar （PALSAR-2） loaded on the Advanced Land Observing Satellite Daichi 2 （ALOS-2）．Among the ponds, we confirmed the collapse and partial destruction of five. In other ponds, the inflow and sedimentation of sand were confirmed in the upstream regions, although they did not lead to collapse. PALSAR-2 was able to capture the sedimentation and driftwood accumulation in ponds that had an area of more than 5,000 m². On the other hand, ponds with an area of less than 5,000 m² in the mountainous region were not always captured by PALSAR-2 due to geometric distortion effects in the SAR images.</p>

DOI： 10.4157/ejgeo.14.271

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Publishing type：Research paper (bulletin of university, research institution)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Landslide Society  

DOI： 10.3313/jls.55.13

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

&nbsp;A new method using GPS is proposed for dynamic displacement monitoring. The method is characterized by a three-dimensional dynamic displacement that can be measured with high accuracy. It is based on a carrier phase observation technique, like GPS relative positioning, and takes a time differential carrier phase, while it requires only one sensor as in GPS single positioning. Thus, it is called self-relative single positioning. This paper describes the formulation of the method, the experiment results for investigating the ability of the newly developed sensor, and a practical application of the method to monitoring a floating pier. The proposed method uses a new sensor that can monitor dynamic displacements of more than 5 mm of amplitude and less than 2 Hz of frequency.

DOI： 10.2208/jscejcei.73.25

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本大ダム会議  

CiNii Books

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Part of collection (book)   Publisher：CRC Press  

The Global Positioning System (GPS) has been widely used for monitoring the displacements of slopes, open pit mines, dams, etc. in various rock engineering projects. This article begins by outlining GPS and then reviews the procedure for the displacement monitoring method together with error correction methods based on the ISRM suggested method. Practical applications for monitoring landslides, cut slopes, quarries, dams, etc. are illustrated to verify this technology.

DOI： 10.1201/b20406

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Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Landslide Society  

DOI： 10.3313/jls.54.215

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：International Society for Rock Mechanics  

When a tunnel is constructed in a landslide area, the excavations may indu ce the instability of nearby slopes. However, it is not clear how tunnel excavations actually affect laandslide behavior. In order to establish a design for both the construction method of the tunnels and the countermeasures required for such unstable conditions, it is important to reveal the mechanism of thhe behavior. The objectives of this study are to find an appropriate numerical modelling to simulate the displacement behavior of a landslide slope due to tunnel excavations and to discu ss the mechanism of the behavior.

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Landslide Society  

DOI： 10.3313/jls.53.240

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：Japan Society of Civil Engineers  

&nbsp;Nowadays, numerous types of plans for using underground space are considered in relation to infrastructures, commercial spaces and public spaces. Further applications to environmental preservation, the effective use of space in mega-cities with high-population densities, the protection of people's lives and property from disasters, etc., are also among the subjects currently being discussed. Therefore, opportunities for people to spend time in underground spaces will continue to increase in the future, and some new methods are greatly needed for creating attractive underground spaces.<br>&nbsp;In order to succeed in designing attractive underground spaces, it is effective to employ the idea of human sensibility in addition to conventional engineering viewpoints.<br>&nbsp;In this paper, the colors and shapes of underground spaces are employed as the design parameters, and the relationship between these parameters and the impressions people have of underground spaces is investigated. For this purpose, questionnaires are conducted by showing design examples of an underground space to respondents and by applying the methods of a correspondence analysis and a cluster analysis for a discussion on the results. Finally, &ldquo;a perceptual map&rdquo; is derived as a chart for the design of underground spaces.

DOI： 10.2208/jscejusr.72.1

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Japan Society of Dam Engineers  

Exterior deformation is one of the most important items to measure when managing the safety of embankment dams. A conventional surveying method, using targets installed on the crest and the slopes of the embankment dams, is usually employed to measure exterior deformation. It is difficult, however, to measure the deformation by such a method immediately after an earthquake or other emergency. A displacement monitoring system using GPS (Global Positioning System) was developed to continuously monitor the deformation of dams. The system can provide three-dimensional displacements at many points simultaneously with high accuracy at the millimeter level. Ishibuchi Dam is a concrete-face rock-fill dam; it is one of the oldest rock-fill dams in Japan. After the large settlement caused by the Iwate-Miyagi Nairiku Earthquake of 2008, the above GPS displacement monitoring system was installed to continuously monitor the deformation behavior. On March 11, 2011, the Great East Japan Earthquake struck near the northeast coast of Honshu Island. This paper describes the results of the deformation monitoring of Ishibuchi Dam before, during, and after the Great East Japan Earthquake, and discusses the validity of the system for the safe management of dams after earthquakes.

DOI： 10.11315/jsde.25.6

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Other Link： https://jlc.jst.go.jp/DN/JLC/20008165655?from=CiNii

Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER WIEN  

The fracture toughness of a rock often varies depending on the specimen shape and the loading type used to measure it. To investigate the mode I fracture toughness using semi-circular bend (SCB) specimens, we experimentally studied the fracture toughness using SCB and chevron bend (CB) specimens, the latter being one of the specimens used extensively as an International Society for Rock Mechanics (ISRM) suggested method, for comparison. The mode I fracture toughness measured using SCB specimens is lower than both the level I and level II fracture toughness values measured using CB specimens. A numerical study based on discontinuum mechanics was conducted using a two-dimensional distinct element method (DEM) for evaluating crack propagation in the SCB specimen during loading. The numerical results indicate subcritical crack growth as well as sudden crack propagation when the load reaches the maximum. A K-resistance curve is drawn using the crack extension and the load at the point of evaluation. The fracture toughness evaluated by the K-resistance curve is in agreement with the level II fracture toughness measured using CB specimens. Therefore, the SCB specimen yields an improved value for fracture toughness when the increase of K-resistance with stable crack propagation is considered.

DOI： 10.1007/s00603-014-0550-8

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Mining and Materials Processing Institute of Japan  

DOI： 10.2473/journalofmmij.130.479

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.70.18

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPRINGER WIEN  

DOI： 10.1007/s00603-013-0521-5

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP  

In this study, a cyclic plate load test was conducted for a pavement model in the laboratory to evaluate the mechanical behavior of permeable asphalt pavement with different degrees of saturation. A four-layer pavement model was prepared, and 49 kN was loaded repeatedly through a steel plate, 300 mm in diameter, at a frequency of 1.0 Hz. A total of 100,000 repetitions were applied alternating the saturation conditions of the model between drained (dry) and saturated (wet). The test results showed that the repeated loading under a saturated condition caused a remarkable increase in the elastic deformation of the pavement surface. The normal stress on the subgrade surface showed a decrease in the saturating process, and changed to an increase in the following loading process. Based on a series of elastic analyses for a simple three-layer model, softening of the subbase course and the subgrade occurred in the saturating process, followed by softening of the subbase course and the surface course in the repetition process.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP  

The GPS displacement monitoring system developed by the authors was applied to an unstable steep slope along a national road in Japan. The system was available even during heavy rain, with 30-40 mm/hour, and it provided useful data for assessing the stability of the slope and for managing the safety of the roadway. Three-dimensional displacements could be measured continuously and precisely using appropriate methods for error correction. The applicability of the system for assessing slope stability is also discussed.

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：電力土木技術協会  

CiNii Books

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejpe.68.I_29

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP  

Loads condition on underground powerhouses operated in decades could be varied due to age-related degradation of support members and surrounding rock, and underground water condition. It brings essential concern on the soundness of the underground caverns. This paper shows an application of the continuous management method to an underground powerhouse which have been operated for about five decades and found some broken anchors. For the re-evaluation of the cavern stability, additional monitoring, stress measurement of RC beam and numerical study were conducted. The future behaviors of the cavern subject to probable risk scenarios are studied by using a simple numerical model. Comparing the results to the limit state of the structure forming the cavern, management criteria are established in line with the current state of the cavern. Finally, these studies are summarized and discussed with a view to continuous management of the cavern for existing underground powerhouses.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Research Publishing Services  

Underground facilities should be designed so that people feel more of an attraction to them and a desire to revisit them time and again. For this purpose, it is important that underground structures be designed not only on the basis of conventional engineering viewpoints, i.e., mechanics, costs, safety, etc., but also on the basis of alternative viewpoints. In order to succeed in creating attractive underground spaces, it may be effective to employ the idea of human sensibility during the design stage in addition to the above conventional engineering points of view. The authors have proposed a new approach for the design of underground structures, namely, coupling human sensibility and mechanics. In this paper, the method for designing underground shapes, which couples human sensibility and mechanical sensitivity, is described. In order to verify the method, an example of shape design for underground structures is illustrated. The discussion is extended to explain how color impresses people in terms of its use in underground facilities. It is well known that color is the most important factor in recognizing and evaluating an object. A questionnaire is conducted by showing the animation of an underground space to investigate the effect of color and shape on the impressions people have of it. After applying the correspondence analysis, a chart for designs, called "the image profile", is proposed. Copyright © 2013 by The Society for Rock Mechanics &amp
Engineering Geology.

DOI： 10.3850/978-981-07-3757-3RP-109-P111

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.3313/jls.49.322

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：電力土木技術協会  

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Language：Japanese   Publishing type：Research paper (international conference proceedings)  

DOI： 10.2208/jscejte.68.21

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.3313/jls.49.174

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Mining and Materials Processing Institute of Japan  

DOI： 10.2473/journalofmmij.128.255

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.11315/jsde.22.4

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Engineering Geology  

Monitoring deformations is a key technology for assessing the stability, predicting the risk, managing the safe operation, and reducing the project cost. Although various types of instruments and systems have been developed to achieve successful monitoring, those can be applied to measure one or two dimensional displacements only in local area during short term. In order to overcome such limitations, a new type of GPS displacement monitoring system has been developed by the authors. It can continuously monitor the three-dimensional displacements of the ground surface automatically with high accuracy for long term. Besides it provides monitoring results through the internet in real time, and users can see them at anytime and anywhere. In this paper, the system is outlined and the practical application results are described.

DOI： 10.5110/jjseg.52.256

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Other Link： http://www.lib.yamaguchi-u.ac.jp/yunoca/handle/2012010209

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscejcei.68.1

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：ダム技術センタ-  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本大ダム会議  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Landslide Society  

DOI： 10.3313/jls.48.81

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Other Link： https://jlc.jst.go.jp/DN/JALC/00367998996?from=CiNii

Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.3313/jls.48.100

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本工業出版  

CiNii Books

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper proposes an approach which couples human sensibility and mechanics for the design of underground space shapes. A questionnaire is adopted as a method to assess the preferable shapes for underground spaces from the viewpoint of human sensibility. On the other hand, a new index for assessing the preferable shapes from the viewpoint of mechanics, called "mechanical sensitivity", is defined. A method for designing the shapes, which couples human sensibility and mechanical sensitivity, is described here. In order to verify the proposed method, one example of a shape design for underground space is demonstrated.

DOI： 10.2208/jscejf.66.237

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DOI： 10.11187/ijjcrm.6.1

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

The atmospheric delay is an important factor of measurement error in displacement measurements using the Global Positioning System (GPS). It is, therefore, an essential task to correct the error and to detect the exact displacements. This paper discusses the effectiveness of a correction method to estimate the atmospheric delay using the modified Hopfield model with weather data (i.e. temperature, moisture and atmospheric pressure) obtained at measurement site. The correction method using the atmospheric delay estimated from the Bernese code is also conducted. It is found that the modified Hopfield model with weather data at measurement site is suitable for displacement measurements in geotechnical engineering filed.

DOI： 10.2208/jscejf.65.356

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

When tunnels are constructed around landslide area, the ground tends to be instable due to excavations. It is a crucial issue to design the support system for controlling the ground behavior to be stabilized. This paper proposes an observational procedure for the tunnel construction in landslide area. It is a method to install long-length face bolts and invert struts to resist the ground movement. The size of the support and the time of the installation were decided by using field measurement results. The method was applied to a highway tunnel where a few landslide blocks were existed around the tunnel portals. In this paper the detail procedure is described, and the applicability of the method is discussed on the basis of field measurement results.

DOI： 10.2208/jscejf.65.364

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Mining and Materials Processing Institute of Japan  

Crack propagations in rock will affect stability of rockmass structures. It is important to predict the crack propagation in rock in order to design the suitable reinforcement or support system. Therefore, authors focus on a distinct element method based on discontinuum mechanics. In this method, a material is expressed as assemblies of rigid circular particles, and input parameters are not mechanical properties of the material, such as Young's modulus and Poisson's ratio, but microscopic parameters related to each particle. <BR>This paper firstly describes the numerical simulation using Particle Flow Code (PFC2D) of uniaxial compressive test and Brazilian test so as to determine the proper microscopic parameters of Kimachi sandstone. Stress-strain curves obtained from the uniaxial compressive tests and tensile stress-axial strain curves obtained from the Brazilian tests show that the model can represent not only uniaxial compressive strength, Young's modulus, Poisson's ratio, but also tensile strength, by adopting the clump model. And then numerical simulations of mode I, mode II, and mixed mode fracture toughness testing using Semi-Circular Bend (SCB) specimen are conducted. The results of the simulation are compared with the experimental data. It is found that the differences of the fracture toughness values obtained by the numerical simulation and experiments are within 10%. The locations of the failure plane by the numerical simulation are good agreement with that observed by experiments. In conclusion, the Particle Flow Code can simulate both crack resistance properties and direction of the crack propagation in rock.

DOI： 10.2473/journalofmmij.124.611

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Language：English   Publishing type：Research paper (other academic)  

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：PERGAMON-ELSEVIER SCIENCE LTD  

In order to understand the mechanism of the effects of ground supports and reinforcements on tunnel stability, numerical simulations are conducted using the distinct element method. Four cases of simulations are carried out in this paper for tunnels excavated in a sandy ground to investigate the effects of (1) dowels and a lining on a single tunnel, (2) dowels and a lining on two parallel tunnels, (3) forepoling and face bolts on a single tunnel face, and (4) forepoling and face bolts on two tunnels which face each other. It is found that the use of ground supports causes a discontinuous ground to behave as a continuous one. In addition, it is revealed that supports help to form ground arches in the sandy ground. Detailed discussions are given considering the stress paths and the stress distributions. (C) 2007 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tust.2007.10.003

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Landslide Society  

A new type of noncontact displacement meter has been developed that employs a diffusion laser beam (DLB) . This DLB system was adopted to reduce the influence of weather conditions on measurements and to avoid any harmful effects to the eyes, skin, etc. To achieve these goals, the DLB displacement meter employs a large-diameter light source and has a large diffusion angle. In addition, it displays the measurement value in real time, performs continuous measurements, can be installed at sites inexpensively, and is capable of measuring displacements greater than 30cm.<br>In order to verify the precision, performance, and utility of this DLB displacement meter, some experiments were conducted in the laboratory and outdoors. The results of the laboratory experiments demonstrated that the DLB displacement meter could measure displacements of 10. 0mm on a 50-m baseline length to a precision of within ± 0. 2mm. This precision is higher than that of a surface extensometer, which is a contact-type meter. The open-air experimental results showed that the DLB displacement meter is influenced less by obstacles between the meter and the measurement point than conventional laser-beam displacement meters. In addition, the DLB displacement meter was capable of measuring with a precision of ± 0. 8mm under a visibility of 10m on a 16-m baseline length, whereas a prism total station was not able to measure to the same level of precision under identical conditions. In particular, comparison testing in the open air revealed that the surface extensometer produced appreciable measurement errors due to poor tracking of the invar wire on expansion or contraction, whereas the DLB displacement meter exhibited good tracking of the displacements in front of and behind the reflective plate.<br>The DLB displacement meter was applied to landslide monitoring. Its accuracy and applicability were equal to or exceeded those of a surface extensometer in practice.

DOI： 10.3313/jls.44.339

CiNii Books

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Mining and Materials Processing Institute of Japan  

In order to develop a better practice for enhancing the cost performance and reducing the risk of construction of underground openings, the authors focus on the cablebolting. A field experiment was conducted during constructing an underground powerhouse to establish a construction practice of cablebolting, involving measuring an effectiveness of preset cablebolts for the rock stability.<BR>The conventional construction procedures and equipments for dowels are found to be applicable to cablebolting. The pre-mixed cement, which is commonly applied for conventional dowels, are also applicable to a grout material for cablebolting by adjusting the water-cement ratio of 40 to 45%, which can be controlled by the flow value of around 180.<BR>Through the back analysis considering the non-uniformity of rock elasticity around the underground powerhouse, it is found that the preset cablebolts alleviate the stress relax in the surrounding rock of the underground powerhouse due to its excavation. Such back analysis is useful during the excavation of an underground powerhouse to measure the effectiveness of preset cablebolts and to manage adequate arrangement of post-set supports such as dowels and pre-stressed anchors.

DOI： 10.2473/journalofmmij.124.112

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

The accuracy of displacement measurements using GPS depends on the environment surrounding the receiver set on the measurement point. Overhead obstacles of the receiver cause a disturbance to the signals transmitted from the satellites and a degradation of the measurement accuracy. In this paper, it is shown that the influence of overhead obstacles can be found by the double-difference phase, and a method for improving the measurement accuracy is proposed. In order to verify the method, it is applied to long-term measurement results. In addition, field experiments are conducted to detect small displacements. It is proven that the proposed method can be effective not only for improving the measurement accuracy, but also for shortening the time required to detect displacements.

DOI： 10.2208/jscejf.64.394

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

In order to improve the reliability of displacement measurements, using the Global Positioning System, it is an essential task to detect the exact displacements from measurement data scattered among various types of errors. This paper discusses the atmospheric delay caused by changes in weather conditions as an important factor in the measurement errors, and proposes an error correction method for it. A computer program is developed, and it is applied to practical measurement results in order to verify the proposed method.

DOI： 10.2208/jscejf.63.437

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Language：Japanese   Publishing type：Research paper (other academic)   Publisher：電力土木技術協会  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscejf.62.662

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Language：Japanese   Publishing type：Research paper (scientific journal)  

This article gives an overview of the developments in numerical and analytical methods in tunneling. It presents the purposes of the methods in terms of their applications to tunneling practices and to future issues considering the constant changes in our surrounding social environment.

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Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10444883

Language：English   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (other academic)   Publisher：日本工業出版  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscej.2005.784_31

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Language：Japanese   Publishing type：Research paper (other academic)   Publisher：土木工学社  

CiNii Books

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DOI： 10.2208/jscej.2004.764_157

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：MILLPRESS SCIENCE PUBLISHERS  

A new type of displacement monitoring system, using the Global Positioning System (GPS), can provide highly accurate and precise three-dimensional measurement results. In this paper, an outline of the GPS displacement monitoring system is introduced and an interpretation method for the measurement results, namely, the Displacement Monitoring Approach (DMA), is proposed for assessing slope stability.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：MILLPRESS SCIENCE PUBLISHERS  

This paper discusses a new approach to the shape design of underground spaces, which combines human sensibility and a knowledge of rock mechanics. The approach includes assessing the preferable shape for underground spaces from the viewpoints of human sensibility and mechanics. A questionnaire and a numerical analysis are conducted for the design. The relationship between human sensibility and mechanical sensitivity is derived in terms of the shapes of underground spaces, and an example of a shape design is demonstrated using the proposed approach.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

A new type of displacement monitoring system, using the Global Positioning System (GPS) developed by the authors, can provide highly accurate and precise measurement results compared with conventional GPS receivers. This paper outlines the system and the results of some practical applications. The Displacement Monitoring Approach (DMA) is also proposed as an interpretation method for measured displacements in the assessment of slope stability.

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Underground space is presently being used for recreation, shopping, restaurants, sports, art, and amusement, which enrich our lives, as well as for tunnels, powerhouses, and mining resources in the field of rock mechanics. Civil engineers usually design such facilities in underground space from conventional engineering points of view, i. e., mechanics. During this new century, public facilities should be designed so that people anticipate feeling great pleasure from the facilities and desire to revisit them. In order to address such anticipation during the design stage, it may be effective to employ the idea of human sensibility (Kansei). This paper discusses an approach for using human sensibility, together with rock mechanics, to design shapes for underground space.

DOI： 10.2208/jscej.2003.742_159

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

The displacement of the ground is measurable in three dimensions with high-precision by receiving the signal from a GPS satellite. We have a number of GPS-based continuous monitoring systems installed at various strategic locations, and have obtained enormous observation results. The high-precision observation by GPS is enabled by performing continuous observations, and equalizing and predicting the observation error of GPS signal. The GPS continuous monitoring system consists of GPS sensor, power supply system, data-communications system, and continuous analysis system. We herein briefly introduce how this system is configured in the real observation fields and what kind of results this system has brought about.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

A new monitoring system, which uses the Global Positioning System (GPS) to measure displacements, has been developed for the maintenance of roadside slopes. The data received from satellites are transmitted to the server computer through optical fiber or the telephone line. The server, which is controlled by the authors, analyzes the data and provides the measurement results together with information on the geological conditions, the weather, etc., to the client via the Internet. The system can provide reliable measurements for slope monitoring and efficient communication at a low cost.

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2473/shigentosozai.119.370

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Mining and Materials Processing Institute of Japan  

A displacement monitoring system has been developed using the Global Positioning System. It has been applied to large slopes of limestone quarries, landslide slopes to monitor the slope stability. The system can measure the three dimensional displacements continuously and automatically. The accuracy of measurements is beyond the standard one of the GPS by applying the trend model to the measurement results.<BR>This paper focuses on two topics. One is long-term continuous monitoring and the other is monitoring under the condition of the high height difference between the measurement points. The errors and the periodic characteristics of the measurement results are discussed through case studies. And then the standard deviation is shown in the relation to the distance and the height difference between measurement points. It will be available for planning the displacement measurement using GPS.

DOI： 10.2473/shigentosozai.119.389

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Other Link： https://jlc.jst.go.jp/DN/JALC/00230825343?from=CiNii

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

The conventional single positioning method of GPS is generally not enough accurate for precise surveying. The authors have developed a method for measuring relative coordinates between two measurement points with better accuracy than the conventional one for the single positioning method.<br>In this paper, a new procedure of displacement measurements using the single positioning method is proposed. The trend model is applied to the previous method for smoothing the scattered measurement results. In order to verify the proposed procedure, numerical simulations with using measurement results are demonstrated for landslide displacement measurements.

DOI： 10.2208/jscej.2003.735_221

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Language：English   Publishing type：Research paper (scientific journal)  

As complexity and unpredictability exist in nature, careful observations and interpretations of what can be measured in the field become prerequisites for geotechnical engineers to conduct safe and economical construction works. Observational methods have evolved from basic visual procedures, conducted on site, to sets of sophisticated procedures using modernized measuring instruments and computer-based back analysis techniques. From the wide range of procedures available for modern tunneling engineering in this field, the present paper tries to address a series of back analysis procedures in which the identification of strain distribution is sought as the primary goal in order to achieve a solid and reliable routine of observations and data interpretations. The discussion starts by identifying structures and flows of forward and back analyses
and it is then expanded to cover several back analysis procedures, including application examples, formulated for linear and non-linear material behaviors. The current status and limitations of the procedures available are also discussed. © 2003 Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S0886-7798(03)00026-9

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

Cable bolting is a support method for the pre-reinforcement of rock masses. It has the potential to strengthen rock masses and make them more ductile, thus decreasing the number of rock anchors which need to be installed after the excavation. Cable bolting may also be able to upgrade the construction efficiency and the stability of underground caverns, such as underground hydropower stations. Nevertheless, cable bolting has not been used much yet in Japan. In this research, field experiments are planned and carried out in order to investigate the applicability of cable bolting to the construction of an underground powerhouse. Numerical simulations are also conducted to better understand the mechanism of the effects of cable bolting from the viewpoint of the path of the rock stress.

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：WILEY-BLACKWELL  

In this paper, numerical simulation results of isotropic compression and triaxial static shear tests under drained and undrained stress paths on polydisperse assembly of loose and dense spheres are presented. An examination of the micromechanical behaviour of loose and dense assemblies under drained and undrained conditions, considering the particulate nature of granular materials, has been carried out to explain micromechanically the granular material behaviour at the grain scale level. The numerical simulations have been carried out using a discrete element model (DEM) which considers a 1000 sphere particle polydisperse assembly with periodic space representing an infinite three-dimensional space. In this paper, we present how DEM simulations can contribute to developments in constitutive, modelling of granular materials through micromechanical approach using information on microstructure evolution. A series of numerical tests are performed using DEM on 3-D assemblages of spheres to study the evolution of the internal variables such as average co-ordination number and induced anisotropy during deformation along with the macroscopic behaviour of the assemblage in drained and undrained shear tests. In a qualitative sense, the macroscopic stress-strain results and stress path evolution in these simulations using 3-D assemblies demonstrate that DEM simulations are capable of reproducing realistic compression and shear behaviour of granular materials. Copyright (C) 2002 John Wiley Sons, Ltd.

DOI： 10.1002/nag.240

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

The GPS displacement monitoring system has been developed to monitor the stability of large slopes by the authors. In this research, the trend model is used for smoothing displacements measured by the system, and the applicability of model is investigated through the field experiments and practical monitoring. It is verified that the trend model is useful for improving the measurement accuracy of the conventional GPS surveying. Methods for predicting the final displacement and the failure time of slopes from continuous monitoring results are proposed, and their applicability is also verified.

DOI： 10.2208/jscej.2002.715_333

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

The new monitoring system was developed for maintenance of roadside slopes. For the decent maintenance, highly accurate measurements of slope movements and a well-organized communication method need to be established. In the new monitoring system, slope movements are monitored by the Global Positioning System (GPS), and estimated with a stochastic smoothing method (a trend modeD . The monitored data are transmitted to the officers of slope management agents through Internet. This new system achieves more reliable measurements of slope movements and a more efficient communication method with low cost.

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Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10442376

Publisher：Japan Society of Civil Engineers  

In order to make tunnels more stable, dowels, shotcrete and other type of support are installed. However, the mechanism of the effect of such tunnel supports isn't still clear. In this study, numerical simulations using the Particle Flow Code are conducted for understanding the mechanism of support effects of dowels and lining on tunnel excavated in sandy ground.<BR>The results show that the dowels and lining effect for making discontinuous behavior of the ground around a sandy tunnel continuous one, and that those help the sandy ground to form the ground arch. The detail discussions are given using stress path and stress distribution.

DOI： 10.11532/journalte1991.12.153

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Portable GPS has never been used in practical surveying because of its poor accuracy, but it has great potential for practical use due to its low cost equipment. We proposed a method to improve positioning accuracy in portable GPS surveying by adopting differential GPS in which four active signals from four satellites are fixed during the period of measurement at the two end stations. On May 1, 2000, the intentional degradation of the GPS signals, known as Selective Availability (SA), was turned off. This study aims to compare the results of the positioning accuracy before and after the cessation of SA. The experimental results indicated that our proposal of positioning accuracy is still applicable even after the termination of SA.

DOI： 10.2208/jscej.2001.693_245

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A simple practical method to characterize the strength and stiffness of jointed rock masses is presented in this paper. The empirical relations for the strength and stiffness of rock masses have been arrived based on the statistical analysis of a large amount of experimental data, which are used for representing the jointed rock mass as an equivalent continuum. The effect of joints in the rock mass is taken into account by a joint factor. These obtained relations are incorporated in a non-linear FEM code to represent the equivalent continuum analysis. The equivalent continuum model has been validated against experimental results for jointed rock masses with different joint fabric and joint orientation and also with the results from explicit modeling of joints using FEM. The developed model has also been applied to calculate the deformation around a large power station cavern in rhyolite rock at 200 m depth. © 2001 Elsevier Science Ltd. All rights reserved.

DOI： 10.1016/S1365-1609(01)00010-7

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

In this paper, numerical simulation of 3-dimensional assemblies considering 1000 spherical particles under monotonic undrained (keeping assembly volume constant) and drained conditions were carried out using discrete element model. The objective of this work is to understand and explain micromechanically the phase transformation behavior of medium dense sands and compare with that of characteristic line which represents initial zero dilatancy state in drained tests.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

As complexity and unpredictability exist in nature, careful observations and interpretations of what can be measured become prerequisites for geotechnical engineers to conduct safe and economical construction works. Observational methods have evolved from basic visual procedures, conducted on site, to sets of sophisticated procedures using modernized measuring instruments and computer-based back analysis techniques. From the wide range of procedures available for modem tunneling engineering in this field, the present paper tries to trace the brief history of a series of back analysis procedures in which the identification of strain distribution is sought as the primary goal in order to achieve a solid and reliable routine of observations and data interpretations. The discussion starts by showing why knowledge of the strain distribution is important; and it is then expanded to cover several back analysis procedures, including application examples, formulated for linear and nonlinear material behaviors. The current states and limitations of the procedures available today suggest that the identification of the stress distribution should be the ultimate goal for the future.

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Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10441237

Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

The greatest disadvantage of portable GPS measurement: compared to high precision GPS measurement is its poor accuracy. And the greatest advantage of portable GPS measurement is its low cost in equipment for practical surveying purpose. Until now, portable GPS has never been considered for practical surveying due to its inadequate results in measurement. However, effort for improvement has been made for utilizing the portable GPS with the relative positioning system. The only method to improve accuracy in measurement is to adopt differential GPS under the condition that four satellites are set and fixed during measurement at the two stations. Cellular phones are used both as tools for communication and for transferring data between two stations. Throughout the discussion, it is indicated that the portable GPS could be efficiently applicable to positioning in surveying.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

This paper describes a displacement monitoring approach for the assessment of slope stability. A new displacement monitoring system using the Global Positioning System was developed together with a data processing method for improving monitoring results. Practical applications of the system to an open quarry and a landslide slope are discussed.

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Language：Japanese   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Yamaguchi University  

This report describes the results of performance tests on a small, low-powered GPS receiver. The tests were conducted for fourteen baselines to obtain the three-dimensional relative coordinates between two measurement points. The standard deviations of the baseline lengths and the three components of the coor dinates were calculated from the measurement results. They were exhibited in relation to the baseline lengths and the observation times. It was found that this small, low-powered GPS receiver performed in almost the same precision as the conventional receivers. Therefore, this receiver has the potential for use in displacement measurements.

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2473/shigentosozai.114.397

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Language：Japanese   Publishing type：Research paper (scientific journal)  

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Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10440317

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Yamaguchi University  

Numerical analysis can help engineers to understand mechanism of rockmass behavior and apply for design of tunnels, underground caverns, slopes and foundations. The various application codes for analysis in rock mechanics have been developed, and they becomes widely used in design practice. This report describes application examples of engineering codes, UDEC and FLAC, to analysis some rock mechanics problems; i.e., (1) assessment of stability of a discontinuous rock slope at a tunnel entrance, (2) behavior of a large section shallow tunnel, (3) reinforcement of weak ground around a shallow tunnel, and (4) cablebolting in soft and weak rock. They demonstrates these codes are very useful for better understanding mechanism of rockmass behavior.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

Indices to evaluate the accuracy of back analysis for determining rock stress are introduced. Numerical simulations are conducted to find the optimum locations for displacement measurements in back analysis using these indices. The appropriate installation angles and lengths of the extensometers and the required accuracy of the measurements are discussed.

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA PUBLISHERS  

Back analysis has been recognized as an effective tool for the observational design method. In this paper, back-analysis methods for continuous and discontinuous rock mass behavior are integrated for monitoring underground openings.

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2473/shigentosozai.113.549

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Language：Japanese   Publishing type：Research paper (other academic)   Publisher：石灰石鉱業協会  

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Language：Japanese   Publishing type：Research paper (other academic)   Publisher：土木工学社  

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Language：English   Publishing type：Research paper (international conference proceedings)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Although tide level observations are important for surveying tide behavior and marine construction, it is still difficult to obtain these observations in the area where tide flows rapidly and changes occur suddenly. Authors propose an application of the GPS (Grobal Positioning System) to tide level observations and an equipment for detecting ship oscillation.<br>The results of field experiments show the method proposed here is applicable for tide level observations. Furthermore, the laboratory and field tests show the equipment developed in this research is effective to detect and compensate the short period oscillation of ships in the case of offshore observation.

DOI： 10.2208/jscej.1996.546_39

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper proposes a back analysis method of measured displacements for predicting deformational behavior of discontinuous rock mass. The method is formulated by the adaptive filtering combined with the Backward Discontinuous Deformation Analysis formula proposed by Shi. It can estimate the present deformational behavior of discontinuous rock mass and also predict the final behavior of rock mass from measured displacements. Geometrical conditions of discontinuous rock mass, i. e. location and direction of discontinuities, are required in the method, but any mechanical constants of rock mass are not needed. In order to verify the proposed method, numerical simulations are conducted.

DOI： 10.2208/jscej.1996.547_11

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

The real-time GPS (Grobal Positioning System) marine surveying system has been completed in this research. In order to improve the applicability of the system, the following two items are adopted: (1) a new wireless transmission apparatus; and (2) the dual frequency OTF (On The Fly) calibration method.<br>To verify the system, the field investigation was conducted around the Kanmon strait area.<br>Results showed that the system developed here is available for a range (35-40km) twice the size of the former system. The reliability of wireless data transmission and OTF calibration was also improved.

DOI： 10.2208/jscej.1996.546_63

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Displacement measurements and monitoring have a important role in design, assessment and control of ground structures as well as in the mitigation of ground disaster. The authors have developed a real-time monitoring system for ground displacement measurements by using the Global Positioning System.<br>This paper describes the detailed configuration of the system hardware and software. The results of the field experiments, performed to investigate the measurement accuracy of the system, are also shown. The system developed here will be useful for continuous displacement measurements of the ground over an extensive area.

DOI： 10.2208/jscej.1996.546_157

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

Displacements monitoring around portal area is required to detect sliding behavior at slope as well as ground subsidence due to tunnel excavations.<br>The authors applied the three dimensional surveying system using a high accurate total station to measure ground displacements around a tunnel. It was proven that the system is highly applicable to monitor the stability of portal of tunnel through the practical use.

DOI： 10.2208/jscej.1996.540_25

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DOI： 10.2473/shigentosozai.112.283

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DOI： 10.2208/jscej.1996.534_19

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

A questionnaire on urban tunneling methods was conducted to investigate how engineers understand the applicability of the NATM and the shield method to constructing urban tunnels. From 310 answers to the questionnaire, reasons for adopting the NATM or the shield method were revealed. It was found that the occupation and experience of engineers have affect on deciding a tunneling method. Finally, the linear multiple regression model was used to evaluate the answer of the questionnaire quantitatively.

DOI： 10.2208/jscej.1995.516_63

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Language：Japanese   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

DOI： 10.2208/jscej.1995.510_153

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper proposes a method for improving the accuracy of ground displacement measurements by using the Global Positioning System (GPS). Adaptive filtering was adopted to formulate the method. Numerical simulations were conducted in order to prove the applicability of the method to GPS displacement measurements.

DOI： 10.2208/jscej.1994.487_275

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DOI： 10.2208/jscej.1993.475_137

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：A A BALKEMA  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

In this study, a new system for earthwork progress measurements by using the Global Positioning System (GPS) has been developed. The GPS is an innovative satellite surveying system under development by the US Department of Defense. This paper describes the developments of a device able to control the antenna automatically and a computer program developed for the transformation of coordinates obtained by GPS surveying to the ordinary plane coordinates.<br>In order to verify the practical applicability of the system developed in this study, a case study was conducted, and it can be concluded that the system is useful and effective for practical earthwork progress measurements.

DOI： 10.2208/jscej.1993.468_31

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DOI： 10.2473/shigentosozai.109.1

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Language：Japanese   Publisher：Kobe University  

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Language：Japanese   Publishing type：Research paper (other academic)   Publisher：土質工学会関西支部  

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Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：BRITISH GEOTECHNICAL SOC C/O INST CIVIL ENGINEERS  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Fuzzy Theory and Intelligent Informatics  

DOI： 10.3156/jfuzzy.2.3_300

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Language：Japanese   Publishing type：Research paper (scientific journal)  

CiNii Books

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Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10435676

Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Language：Japanese   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2208/jscej.1988.394_89

CiNii Books

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

This paper presents a back analysis method for determining the complete three-dimensional initial state of stress and elastic constants of the ground, from a set of displacements measured during excavation of underground openings.<br>The method proposed here is formulated by the boundary element method, so that it can easily be applicable to three-dimensional problems, considering the sequence of steps for excavation, and the period for installation of measuring instruments in the back analysis.<br>In order to verify the applicability of the proposed method, computer simulations are carried out and the numerical stability of the method is demonstrated. The effects of scattering measurement data are also discussed in relation to the accuracy of the results.

DOI： 10.2208/jscej.1987.382_55

CiNii Books

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (scientific journal)  

CiNii Books

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Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10434044

Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Kobe University  

CiNii Books

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Kobe University  

CiNii Books

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Kobe University  

CiNii Books

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：土木学会  

DOI： 10.2208/jscej.1986.370_225

CiNii Books

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Publisher：Japan Society of Civil Engineers  

DOI： 10.2208/jscej.1986.376_323

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Kobe University  

CiNii Books

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Kobe University  

CiNii Books

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Language：English   Publishing type：Research paper (other academic)  

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)   Publisher：Kobe University  

CiNii Books

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Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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Language：Japanese  

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Language：Japanese  

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Language：Japanese  

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Presentation type：Oral presentation (invited, special)  

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Language：English   Presentation type：Oral presentation (invited, special)  

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Language：English   Presentation type：Oral presentation (general)  

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Language：English   Presentation type：Oral presentation (invited, special)  

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Presentation type：Symposium, workshop panel (public)  

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Presentation type：Symposium, workshop panel (public)  

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Presentation type：Symposium, workshop panel (public)  

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Presentation type：Symposium, workshop panel (public)  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Oral presentation (invited, special)  

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Presentation type：Symposium, workshop panel (public)  

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Presentation type：Oral presentation (keynote)  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Oral presentation (keynote)  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Oral presentation (keynote)  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Oral presentation (invited, special)  

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Presentation type：Oral presentation (invited, special)  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Language：Japanese  

Venue：早稲田大学国際会議場  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸国際会議場（神戸）  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：神戸国際会議場（神戸）  

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Language：English   Presentation type：Oral presentation (general)  

Venue：ココランド山口宇部  

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Language：English   Presentation type：Oral presentation (general)  

Venue：ココランド山口宇部  

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Language：English   Presentation type：Oral presentation (general)  

Venue：ココランド山口宇部  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：富山大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島工業大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島工業大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島工業大学  

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Language：Japanese   Presentation type：Oral presentation (general)  

Venue：広島工業大学  

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Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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Language：English   Presentation type：Oral presentation (general)  

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Language：English   Presentation type：Oral presentation (general)  

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Language：English   Presentation type：Oral presentation (general)  

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Language：English   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

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Language：Japanese   Presentation type：Oral presentation (general)  

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