| Project/Area Number |
02454072
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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 | KYUSHU UNIVERSITY |
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Principal Investigator |
TAKESHITA Keiji KYUSYU Univ. Fac.Agri. Professor, 農学部, 教授 (20117154)
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| Co-Investigator(Kenkyū-buntansha) |
MORITA Kouichi KYUSYU Univ. Fac.Agri. Assist Prof., 農学部, 助手 (10038341)
MARUTANI Tomomi KYUSYU Univ. Fac.Agri. Associ.Prof., 農学部, 助教授 (40112320)
WATAHIKI Kiyoshi KYUSYU Univ. Trop.Inst. Assist.Prof., 熱帯農学研究センター, 助手 (70128114)
NAKAO Hiromi KYUSYU Univ. Fac.Agri. Associ.Prof., 農学部, 助教授 (40038188)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1992: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1990: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Landslide / Land creep / Glacier / Forest root system / Control function of forest / Soil physical structure / 地すべり / 台風災害 / 土層構成 / 斜面崩壊 / 根系ブロツク / 耐圧縮強度 / ア-チ構造 / 根系ブロック |
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| Research Abstract |
Usually, the stability of a landslide occurrence is evaluated by the balance of forces generated on the slide surface and soil mass in a longitudinal section of a slope. And resistance of forest tree works on the sliding surface. But, it has been confirmed that root blocks make a resistant system, in spite of that the root blocks do not reach the sliding surface, and this facts suggest existence of another mechanisms. Our field observations provide the new idea, that an arch structure latently formed in the sliding body works on three dimensional mechanism. This structure is indicated by which existence of many strong blocks such as tree roots increase the resistance against a landslide occurrence, although blocks do not work on the slide surface. This arch structure ttransmits force sidewards. These forces are finally supported my more stable parts in both side of slope. Thus dynamic action of the structure was checked up by the model experiment in our laboratory, and existence of discontinuous blocks as a arch were recognized universally in a sliding area such as lndslide, landcreep and glacier.
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