斜面の転倒崩壊
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概要
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The author has found a new type of landslide in 1974, which he has designated the toppling type of landslide. The toppling type of landslide can be defined as one of the slope failure which has an apparent center of rotational movement below the earth's surface. Slope surface is severed into blocks by cracks running almost parallel to each other, and because the center of the movement is located underneath, the following characteristic slope changes occur after the movement. First, surface gradient of each block increases due to toppling movement, and secondly, as a consequent result, up-slope end of the block moves up relative to down-slope end of the neighboring block located up-slopeward. This type of landslide frequently occurs where bedding, schistosity, joint and fault planes are running almost vertically. Favorable conditions for the failure are that: 1) cutting these slopes parallel to strikes of these planes, which decreases passive earth pressure, and 2) increase in the level of water table after the rain. The depth of the deformation due to the toppling type of landslide is generally greater than that caused by the common landslide, and a focal point of the earth pressure due to the movement is located near the surface in the toppling type. For these reasons, it is important to distinguish this type of landslide from common landslides in order to effectively investigate and to carry on the stabilization engineering.
- 日本地質学会の論文
- 1986-10-25