Slope failure in the rectilinear zone of hillsides

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  • 傾斜変換帯における崩壊
  • 傾斜変換帯における崩壊〔英文〕
  • ケイシャ ヘンカンタイ ニ オケル ホウカイ エイブン

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Abstract

The mountain slope was divided into two parts, the rectilinear zone and curvilinear zone (the convex or concave zone) by analyzing topographical maps. The frequency and size of slope failure and its position from the upper inflection contour line were studied in regard with the rectilinear or curvilinear zone of the mountain slope. It was then made clear that many slope failures were distributed in the upper part of the rectilinear zone of slope. The measurement of soil condition showed that the surface soil layer was generally deep at the upper part of slope failure and was shallow at the lower part. On the other hand, the depth of the surface soil on nearby nonfailed slopes was quite reverse to the above mentioned situation. From these analyses, it was concluded that the disproportion in the depth of the surface soil layer was closely related to the concentration of infiltrated water and the occurrence of slope failures at the upper part of the rectilinear zone of slope. The rectilinear zone of slope or the upper inflection contour line could probably be a very useful index for predicting the dangerous area of slope failure occurrence in the mountain.

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