Studies on the Occurrence Mechanism of Surface Landslide in Kuchinotu Landslide area

概要

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The relation between the creep upper yield stress τu of cohesive soil near the landslide face and the effective overburden pressure ρε on the landslide face can be expressed as follows: τu=Cc+ρe tanφc where Cc φc are coefficient. A factor of the development of surface landslide in the region of Kuchinotu is the heavy rains amounting to over 250mm. That is, the decrease of effective overburden pressure due to the generation of pore water pressure of artesian condition from the ground water flows in permeable sandstone layers or conglomerate layers is the cause for the decrease of upper yield stress, and landslide is caused by the creep breakage of cohesive soil. After landslide occurred, when the static water pressure due to ground water in the slideface has over constant value by the heavy rains, the slide of layer begins again.
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