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The distribution of pore water pressure along the slip surface used for the stability analysis is usually calculated from the static pressure estimated from the groundwater level. But in landslide slopes which have the multi-stratums with different permeability values, the pore water pressure can not be obtained in this way since the vertical distribution of that is not static. In this paper a simple finite element analysis of groundwater flow with a free surface is used to determine the distribution of pore water pressure along the slip surface. The numerical results of water pressure are in good agreement with the field measurements. The stability analysis of landslide slopes using these distributions of water pressure provides the reasonable factors of safety. キーワード: 地すべり, 浸透流解析, 有限要素法, 間隙水圧, 安定解析

The Stability Analysis of Landslide Slopes using the Finite Element Solution of Groundwater Flow