| Project/Area Number |
10555162
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
OHTA Hideki Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (80026187)
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| Co-Investigator(Kenkyū-buntansha) |
KUWANO Jiro Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (30178149)
TAKEMURA Jiro Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (40179669)
KUSAKABE Osamu Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (40092548)
KOBAYASHI Ichizo Tokyo Institute of Technology, Graduate School of Science and Engineering, Research Associate, 大学院・理工学研究科, 助手 (20303258)
TAKAHASHI Akihiro Tokyo Institute of Technology, Graduate School of Science and Engineering, Research Associate, 大学院・理工学研究科, 助手 (40293047)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Mt. Hakusan / stability analysis / exploration / aerial photograph / erosion / checkdam |
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| Research Abstract |
The whole area of the ridge of Hakusan including both sides of Jinnosuke Valley is becoming unstable. As the results of careful exploration and image analyses of aerial photograph, it was found that the instability of the rock slope on the left bank of Jinnosuke Valley is only a part of complex slide of rock masses on both sides of Jinnosuke Valley. The whole slide seems to be taking place in a form of progressive failure. Rock/water coupled 3-D stability analyses are applied to the colossal mountain-collapse. The analysis is based on simple force equilibrium of a block of rock surrounded with several planes of discontinuity and separated from the neighbouring rock mass in a rock slope. The several planes of discontinuity were found by the exploration and image analyses of aerial photograph. Driven by the own weight of the rock block together with the ground water pressure acting on the planes of discontinuity, the stability of rock mass is maintained by the shear resistance of the materials embedded in the thin clearance forming the slip surface. A slope failure takes place when the shear strength is not strong enough to resist the driving forces. It was found that the simple principle of three dimensional force equilibrium is good enough to estimate the factor of safety in the slopes of rock mass containing the cracks filled with soft clayey materials.
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