| Project/Area Number |
16360236
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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 | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
ASAOKA Akira Nagoya University, Engineering, Professor, 大学院・工学研究科, 教授 (50093175)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANO Masaki Nagoya University, Engineering, Associate Professor, 大学院・工学研究科, 助教授 (00252263)
NODA Toshihiro Nagoya University, Engineering, Associate Professor, 大学院・工学研究科, 助教授 (80262872)
YAMADA Eiji Nagoya University, Engineering, Assistant Professor, 大学院・工学研究科, 助手 (00293647)
NAKAI Kentaro Nagoya University, Engineering, Assistant Professor, 大学院・工学研究科, 助手 (60402484)
TASHIRO Mutsumi Nagoya University, Graduate School of Environmental Studies, Research Associate, 大学院・環境学研究科, 研究員 (00422759)
金田 一広 名古屋大学, 大学院・工学研究科, 助手 (30314040)
長尾 和之 日本道路公団, 試験研究所, 研究員
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,100,000 (Direct Cost: ¥14,100,000)
Fiscal Year 2005: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2004: ¥10,100,000 (Direct Cost: ¥10,100,000)
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| Keywords | Clay / Soli structure / Consolidation / Overconsolidation / Anisotropy / Elasto-plastic constitutive equation |
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| Research Abstract |
In a naturally deposited clay foundation subject to embankment loading, a delayed settlement can often be observed after the embankment's completion, sometimes also showing acceleration over time. The settlement cannot be always predicted from the laboratory test results even with the undisturbed sample. The prediction of the settlement and the long-term period were always underestimated.
In the present study, the compression index ratio Cd Ccr was defined by the ratio of the compression index of the undisturbed sample Cc to remolded sample Ccr, and the in-situ settlement data and the laboratory test results on the about 50 expressways are estimated and classified by the compression index ratio Cd Ccr and sensitivity index St. The mechanism of the large delayed settlement is discussed described by using a soil-water coupled finite deformation analysis with the Supre/subloading Yield Surface Cam-clay model (SYS Cam-clay model). The new findings are as follows :
1)The clay, which exhibits a long-term large settlement beyond the prediction, can have high sensitivity St, the value of which is more than 8.0 and high the compression index ratio Cd Ccr, more than 1.5. Through the simulation by the SYS Cam-clay model, the clay is a high degree of initial structure and show fast decay of the structure.
2)The in-situ compression behavior was predicted from the laboratory test assuming that both the consolidation yield stresses are the same, and the mechanism of the long-term large settlement was discussed taking the sample disturbance into consideration.
3)The occurrence of in-situ secondary/delayed consolidation of clay foundation in Nagashima can be described by using a soil-water coupled finite deformation analysis with the SYS Cam-clay model, and it provide that it is necessary to determine the in-situ initial condition from the laboratory test taking the sample disturbance into consideration.
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