| Project/Area Number |
63460157
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
基礎・土質工学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NAKASE Akio Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (10016686)
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| Co-Investigator(Kenkyū-buntansha) |
SUEMASA Naoaki Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (80206383)
TAKEMURA Jiro Tokyo Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (40179669)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1989: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1988: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | Clay / Normally Consolidated / Embankment / Model Test / Stability Analysis / Deformation / Pore pressure / 有効応力 / 全応力 |
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| Research Abstract |
The purpose of this study Is to examine the validity of currently available stability analyses on the basis of accurate model tests using a geotechnical centrifuge. In-flight construction of a model embankment was carried out on normally-consolidated clay ground and the mechanism of failure was carefully studied. A parameter particularly considered in this study was the magnitude of undrained shear strength at the surface of the ground.
Conclusions drawn from this study are as follows.
1. The failure of normally-consolidated clay ground is of a progressive type with initial failure taking place in the areas near the surface where the strength is relatively low.
2. Sharp reduction of pore pressures takes place in the areas beneath a slope when failure is about to occur.
3. Total stress analyses based on K_0 triaxial strength predict the location of the failure surface accurately, although they underestimate the safety factor. Effective stress analyses give reasonable prediction only when pore pressures in clay are accurately known.
4. The method of failure prediction proposed by Shibata and Sekiguchi Is valid for rapidly-constructed embankments.
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