| Project/Area Number |
21654068
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Geology
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| Research Institution | Kanazawa University |
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Principal Investigator |
SUMITA Ikuro 金沢大学, 自然システム学系, 准教授 (90334747)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥3,280,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2009: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | 地すべり / 地下水 / 浸透流 / 湿った砂 / 圧力 / 間隙水圧 / 地滑り / 有効応力 / 室内実験 / 地下水位 / 崖崩れ / 洪水水位 |
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| Research Abstract |
We have conducted laboratory experiments in which the ground water percolating into the wet sand triggers the landslides. We find that(1) landslides are triggered after the water percolates through the sand column,(2) as the groundwater level rises, the number of slides increases from 0 to 3, after which the whole sand column is pushed in the form of debris flow,(3) the time until the slide occurs agree well with the pressure diffusion time scale determined by the groundwater level. In addition we find that as the water percolates, the pressure at the bottom of the sand column decreases whereas that at the sides increases, prior to the landslide. This suggests that pressure measurements may be used to monitor the precursory stage of the landslides.
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