2013 Fiscal Year Final Research Report
Degradation of permeability of ground due to clogging
| Project/Area Number |
23560600
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Chubu University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
杉井 俊夫 中大学, 工学教授 (90196709)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 目詰まり / 土粒子流出 / 浸透破壊 / 局所動水勾配 / 限界流速 / 団粒化 |
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| Research Abstract |
In this study, it is intended to clarify it about relationship between the destabilization of the ground by the soil particle outflow and the mechanism of the internal erosion. Here, two experiments are conducted. At first, the permeable changes of Toyoura sand and Granite soil are investigated by the test of efflux of soil particles in the one-dimensional vertical flow ground. The occurrence of the efflux of soil particle makes the ground loose, and soil particle effluxed makes other part of the ground dense. Finally, the local hydraulic gradient at the part of the ground increases. Second, authors measure the permeability and the porosity of soil by Dielectric constant-type soil water meter. The volumetric water content is equal to the porosity of soil in saturated soils, therefore, the porosity change can be measured during efflux. With the soil tank that a horizontal flow excels under the levee, the porosity change and the local hydraulic gradient are measured.
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