| Project/Area Number |
62850092
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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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 | Kanazawa University |
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Principal Investigator |
OHTA Hideki Kanazawa University Faculty of Technology, Professor, 工学部, 教授 (80026187)
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| Co-Investigator(Kenkyū-buntansha) |
森田 悠紀雄 基礎地盤コンサルタンツ, 大阪支社, 支社長
MATSUMOTO Tatsunori Kanazawa University Faculty of Technology, Assistant Professor, 工学部, 助手 (10143877)
NISHIDA Yoshichika Kanazawa University Faculty of Technology, Professor, 工学部, 教授 (60019693)
MORITA Yukio Kiso-Jiban Consultants, Osaka Branch, General Manager
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | Unconfined compression strength / Undrained strength / Soft clay / Residual effective stress / Undisturbed sample / 円弧すべり法 |
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| Research Abstract |
Effective stress state of "undisturbed samples" collected from all over japan was investigated aiming at estimating the residual effective stress in the samples after experiencing sampling, trimming and being ready to be subjected to unconfined compression tests. The undrained strength mobilized along the slip circles was theoreticall derived. The average undrained strength along the slip circle being compared with the corrected unconfined compression strength indicated the appropriateness and the limitation of the usage of unconfined compression strength in the stability analysis of soft clay foundations. The backanalysis of 24 case histories of actual failure of soft clay showed a reasonable agreement with the results obtained from the investigation on unconfined compression strength. the conclusions are as follows:
1. The effect of sample disturbance and stress release corresponds to within 0.1 in terms of the factor of safety.
2. The effect of loading rate in the field corresponds to about 0.2 in terms of the factor of safety. This indicates that the selection of construction method and construction sequence is more influencial to the stability of soft foundations rather than the degree of sample disturbance is.
3. The correction factor to be multiplied with the experimentally obtained unconfined compression strength in analysing the stability of soft clays is derived as a function of the plasticity index.
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