Experimental and Numerical Study of Rainfall Induced Slope Failure

Abstract

本研究は, 降雨による斜面崩壊を予測することを目的としている。実験と数値解析により斜面崩壊のメカニズムについて検討を行った。間隙水圧と含水量を解く3次元浸透流解析によって斜面の安定解析を実施した。従来の水相のみの浸透流だけでなく, 水と空気の2相を解析する浸透流モデルを2次元の表層流および浸食/堆積モデルとカップリングし, 実験へ適用し検証を行った。数値解析により, 浸透流と斜面安定において間隙内の空気の影響は小さく, 2相で解析する必要性が低いことがい示された。

The purpose of this study was to predict the failure surface of a slope due to rainfall. Numerical and experimental study was performed to investigate the mechanism of the slope failure. Slope stability analysis was carried out in three dimensions using the pore water pressure and the moisture content calculated by three dimensional seepage flow model. Only a conventional water-phase seepage flow model as well as the water-air two-phase seepage flow model, coupled with two dimensional surface flow and erosion/deposition model, were used for seepage analysis. In numerical analysis, the influence of pore air on seepage and slope stability was found to be less significant.