層状岩盤の層理面に働く間隙水圧特性と安定性

概要

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The Izumi group distributed on the north of the median tectonic line (MTL) on Shikoku Island is composed primarily of inter-layered sandstone and shale rocks It is often found that the shale rock layers, particularly near the MTL are weathered into clay layers In such a condition, the construction of the expressways linking Takamatsu, Tokushima, and Matsuyama over the Izumi group has resulted in a number of cut slope failures through the weak clay layers formed along the dip angle in a form of plain slide due to rise in pore-water pressure following a rainfall In this paper, therefore, efforts are made to evaluate the rise in pore water pressure at the interlayer planes due to rainfall by directly measuring the field pore water pressure and developing a tank model Moreover, the strength parameters for the fully weathered shale rock are determined by the direct shear tests, and the evaluation of cut slope stability in context of rise in pore water pressure is made, which reveals that the most effective method of stabilizing a cut slope in such a situation is the use of drain pipes.
社団法人地盤工学会の論文
2003-11-01