| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2011: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2010: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
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| Research Abstract |
The main objective of the study is to investigate the mechanism of formation and extension of internal erosion and water pathway in the backfill of earth structure by water penetration due to repeated rainfall. In order to evaluate effects of soil grains escaping from the specimen, a special permeability test was conducted. When hydraulic gradient exceeded certain value, fine particles started to flow out of the specimen. Turbidity of the drained water can indicate the degree of currently progressing internal erosion. Even small degree of internal erosion caused significant decrease in penetration resistance.
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