| Project/Area Number |
16560442
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Matsue National College of Technology |
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Principal Investigator |
KAWAHARA Soichiro Matsue National College of Technology, Dept. of Civil and Environmental Engineering, Associate Professor, 環境・建設工学科, 助教授 (50169752)
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| Co-Investigator(Kenkyū-buntansha) |
SHIBATA Toshifumi Matsue National College of Technology, Dept. of Civil and Environmental Engineering, Research Associate (30342546)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
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| Keywords | rockfall / impact force / rock shed / sand cushion / laboratory test / geotechnical disaster / 落石覆工 |
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| Research Abstract |
To investigate the effects of the dry density and thickness of a sand cushion on an impact response due to a falling weight likened to a rockfall, a series of laboratory experiments for a decomposed granite soil was executed in the combination of the mass and drop height of the weight. As a result, the following conclusions were obtained.
●The sinkage of the falling weight and the impact duration decrease with the dry density of the soil ; however, they do not depend on the thickness of the soil.
●The impact acceleration increases with the dry density of the soil ; however, it does not depend on the thickness of the soil.
●The earth pressure at the bottom of the mold increases with the dry density ; and, it deceases with the thickness of the soil.
●The transmission ratio of the impact pressure hardly depends on the dry density of the soil ; however, it decreases rapidly with the thickness of the soil.
●The sinkage of the falling weight having a hemisphere bottom is larger than a flat bottom.
●The impact acceleration of the falling weight having a hemisphere bottom is smaller than a flat bottom.
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