| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
The sites investigated were a slope failed in March, 2014 at the Kosaka chain base of Joshinnetsu Expressway and about 50 bursting points of debris flows that hit residential areas in the northern part of Hiroshima on 20th August, 2014.
The drained strength of the clay seam sampled from the rock discontinuity forming the potential slip plane lead to a reasonable result of stability of Kosaka slope. This justified the countermeasure of lowering the ground water level by placing drainage wells at the site. Established was an empirical graph showing the maximum possible distance of debris flow, i.e. the equivalent friction coefficient as a function of volume of collapsing rock mass, based on the data obtained from debris flows at Hiroshima. In-depth investigation of the flow route of the ground water in the body of the mountain was made.
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