Experimental and discrete element numerical analysis of side slope instability induced by fissure water underlying imper

When the sliding mass contains impervious bed, rainfall can infiltrate into mountain via crevices and form higher artesian aquifer at impervious bed inferior. This will decrease slip resistance and increase sliding forces of the sliding mass, thus lowering the safety factor, and inducing landslide disasters. In this paper, a landslide experimental apparatus is designed for experimental studies on the mechanism of this type of landslides. Meanwhile, the non-dimensional parameters in the model experiment are taken into account using dimensional analysis. The experimental results show that (1) the ratio of the cleft water pressure to the overlying pressure is a crucial parameter affecting the stability of the slope; (2) when the shut-in pressure reaches 80% of the normal component of the pressure on the slip surface made up of rock and soil, landslide will occur; (3) the whole slope will start to slide when the shut-in pressure is equal to the normal component of the pressure formed by the overlying rock and soil on the upper 30% area. In this article, a discrete element method simulation is used to investigate the influence of cleft water pressure and shearing strength on the landslide stability. It can be concluded that the critical value of Ccr, ψcr, which determines the slide mass stability,increases with the increase of the water pressure; if the water pressure reaches a high level, the stability of the slide mass depends mainly on C, while the influence of ψ becomes smaller than C.

作 者： LIU Bingshan LI Shihai ZHANG Lei WANG Jianguo   作者單位： LIU Bingshan,LI Shihai(Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China)

ZHANG Lei(Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China;Graduate School, Chinese Academy of Sciences, Beijing 100060, China)

WANG Jianguo(Tropical Marine Science Institute, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260) 

刊 名： 中國科學E輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA SERIES E(TECHNOLOGICAL SCIENCES)  年，卷(期)： 2005 48(z1)  分類號： P61  關鍵詞： impervious bed   rainfall infiltration   pore water pressure   landslide experiment   displacement monitor   discrete element method  

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