| Project/Area Number |
26560182
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Natural disaster / Disaster prevention science
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| Research Institution | Chiba University |
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Principal Investigator |
Nakai Shoichi 千葉大学, 工学(系)研究科(研究院), 教授 (90292664)
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| Co-Investigator(Kenkyū-buntansha) |
SEKIGUCHI TORU 千葉大学, 大学院工学研究科, 准教授 (50451753)
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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 |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 液状化 / 不飽和化 / 既存宅地 / 地下水位低下 / 地下水位回復 / 飽和度 / P波速度 |
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| Outline of Final Research Achievements |
The 2011 Tohoku Earthquake caused extensive liquefaction damage over a wide area. A combined process of lowering and subsequent restoring the groundwater level can be used as a countermeasure against liquefaction, since this process is believed to create an unsaturated soil layer. The authors have conducted centrifuge shaking table tests in order to examine this idea by building a special test apparatus for this purpose. From the tests, it was found that the lowering and recovering process actually creates a layer of unsaturated soil and the thickness of liquefied soil is greatly decreased because of this process. In addition to the laboratory tests, the authors have also conducted various in-situ soil investigations including measurement of degree of saturation during a field demonstration experiment of dewatering. According to the results, it was confirmed that the lowering and recovering process of groundwater can create a layer of unsaturated soil also in an actual ground.
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