| Project/Area Number |
08660299
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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 |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
TAKAYAMA Masateru Kyushu University, Faculty of Agriculture, Professor, 農学部, 教授 (60038312)
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| Co-Investigator(Kenkyū-buntansha) |
OKABE Tamenobu Kyushu University, Faculty of Agriculture, Research Assistant, 農学部, 教務員 (60091378)
HIYAMA Hiroki Kyushu University, Faculty of Agriculture, Assistant Professor, 農学部, 助手 (10208788)
OTSUBO Masami Kyushu University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (80112316)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Weathered Basalt Soil / Compacted Soil / Compressibility / Collapse / Strength |
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| Research Abstract |
Onjaku Soil, the weathering product of basalt, is distributed in Uwaba area, north eastern part of Saga Prefecture. Onjaku soil which consist mainly of halloysite and chlorite as clay mineral is classified as clay soil according to Japanese Standard Soil Classification. The general features of this soil are great specific gravity of soil particles, high water content for small clay fraction percentage, and small dried density of around lg/cm^3.
The present paper investigates the compressibility of compacted Onjaku soil. and its settlement behavior due to water immersion. The characteristics of soil compressibility, due to water immersion, changed for soil samples compacted below optimum water content, and expansion or settlement occurred, while the soil compressibilty remained unchanged and no settlement occurred for soil samples compacted above optimum water content, with saturation degree greater than around 85%.
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