| Project/Area Number |
62480064
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | KYUSYU UNIVERSITY |
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Principal Investigator |
TAKESHITA Keiji KYUSYU UNIVERSITY, Fac.of Agriculture, Professor, 農学部, 教授 (20117154)
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| Co-Investigator(Kenkyū-buntansha) |
WATAHIKI Kiyoshi KYUSYU UNIV., Tropical A.R.C.Assistant Professor, 熱帯農学研究センター, 助手 (70128114)
MARUTANI Tomomi KYUSYU UNIV., Fac.of Agri., Associate Professor, 農学部, 助教授 (40112320)
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| Project Period (FY) |
1987 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | resistance of forest to occurrence of landslide / forest root system / disaster of landslide / 根系抵抗 / 杭作用 / 緊縛作用 / 山地崩壊 / 圧縮強度 |
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| Research Abstract |
Usually, we have considered that resistance of forest root system to stability of landslide is done by both functions pile action and net-work in longitudinal section of the slope. Pile action is considered in vertical connection between soil layer and bed rock, net-work is considered in horizontal connection of root blocks with each other.
But, as a result of this study, we recognized both phenomena that most of vertical root system does not reach to bed rock and most of horizontal root blocks do not connect each others in normal slope covered with thick soil layer.
This result means that resistance of root system does not work vertically in the 2-dimensional section of slope. Therefore, we have to consider newly another mechanism in the stability analysis to landslide occurrence.
After some experiments, we have recognized that one kind of arch structure are formed latently in the sloped soil body on the state of over friction angle, and root system blocks increase resistance to compression of arch structure.
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