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| Experimental and discrete element numerical analysis of side slope instability induced by fissure water underlying impervious bed | |
| 作者姓名： | LIU Bingshan LI Shihai ZHANG Lei & WANG Jianguo. Institute of Mechanics Chinese Academy of Sciences Beijing China . Graduate School Chinese Academy of Sciences Beijing China . Tropical Marine Science Institute National University of Singapore Kent Ridge Crescent Singapore |
| 作者单位： | LIU Bingshan1，LI Shihai1，ZHANG Lei1，2 & WANG Jianguo31. Institute of Mechanics，Chinese Academy of Sciences，Beijing 100080，China; 2. Graduate School，Chinese Academy of Sciences，Beijing 100060，China; 3. Tropical Marine Science Institute，National University of Singapore，10 Kent Ridge Crescent，Singapore 119260 |
| 基金项目： | 科技部科研项目，the Important Aspect Project of the Chinese Academy of Science |
| 摘 要： | 1 Introduction The in situ observations and analysis on the landslide events indicate that water is one of the key factors which induce landslide of the mountain mass1―8]. The mechanism offissure water inducing landslide can be generalized into three aspects: (1) the softening influence of water weakens the strength of materials on the slip surface9―11]; (2) the cleft water pressure towards the slide slope free face increases sliding force12―15]; (3) water pressure on the slip surface lo… |
Experimental and discrete element numerical analysis of side slope instability induced by fissure water underlying impervious bed |
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| LIU Bingshan,LI Shihai,ZHANG Lei, & WANG Jianguo. Institute of Mechanics,Chinese Academy of Sciences,Beijing ,China, . Graduate School,Chinese Academy of Sciences,Beijing ,China, . Tropical Marine Science Institute,National University of Singapore, Kent Ridge Crescent,Singapore .Experimental and discrete element numerical analysis of side slope instability induced by fissure water underlying impervious bed[J].Science in China(Technological Sciences),2005,48(Z1). | |
| Authors: | LIU Bingshan LI Shihai ZHANG Lei WANG Jianguo |
| Affiliation: | 1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China 2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China;Graduate School, Chinese Academy of Sciences, Beijing 100060, China 3. Tropical Marine Science Institute, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260 |
| Abstract: | 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, ?cr, 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 ? becomes smaller than C. |
| Keywords: | impervious bed rainfall infiltration pore water pressure landslide experiment displacement monitor discrete element method |
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