| Project/Area Number |
26820190
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geotechnical engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
Isobe Koichi 北海道大学, 工学(系)研究科(研究院), 准教授 (70452084)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 粘土の構造 / 不かく乱試料 / 残留間隙水圧 / 地震後圧密 / 繰返し三軸試験 / 遠心模型実験 / 土水連成FE解析 / 地震 / 再圧密 / FEM解析 / 現地調査 / 地震被害 / 粘性土 / 繰返しせん断 / 圧密沈下 / 土の構造 / 有効応力解析 |
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| Outline of Final Research Achievements |
Subsidence in Kashiwazaki has been observed after the earthquake of 2007. Unlike subsidence due to drawdown of groundwater level, it has become clear that there is no correlation between the subsidence and the groundwater level. The previous research has been concluded that long-term dissipation behavior of excess pore water pressure (EPWP) occurred during the earthquake is the main factor. However, because it does not match with the observations, the addition field survey was conducted to explain the remaining conditions of EPWP and understand the continuous clay soil constants. It were used to improve the accuracy of the simulation and investigate the effect on settlement behavior under various conditions. As the mechanism, focusing on the compression softening phenomenon caused by loss of the structure, through the results of the cyclic triaxial test and centrifugal model tests, it was reviewing the possibility that compression softening phenomenon occurs.
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