降雨诱发堤防边坡失稳数值模拟研究  

Numerical Simulation of Slope Instability Induced by Rainfall in Reservoir

作　　者：陈凯 CHEN Kai(Anhui Province Simashan River Diversion Project Management Office,Maanshan 238251,Anhui,China)

机构地区：[1]安徽省驷马山引江工程管理处,安徽马鞍山238251

出　　处：《水利科技与经济》2023年第3期118-120,共3页Water Conservancy Science and Technology and Economy

摘　　要：以河道堤防工程边坡为例,利用有限差分数值模拟软件FLAC,分析该边坡在降雨作用下的变形破坏过程,并研究其失稳机制。结果表明:①该边坡失稳是由于降雨导致岩层分界面上产生超孔隙水压,孔压值为4.0×10^(5) Pa,并且滑面土体抗剪强度降低,从而发生失稳;②该边坡破坏首先从坡脚开始,属于牵引式滑坡,计算得到该边坡安全系数为0.89,处于不稳定状态。研究结果对降雨诱发边坡失稳机理研究具有一定的参考意义。Slope instability caused by rainfall is very common in mountain area,which seriously affects the safety of hydraulic engineering and other infrastructure.Therefore,it is important to study the mechanism of slope instability under rainfall for engineering construction.In this paper,taking a reservoir slope as an example,the deformation and failure process of the slope under the action of rainfall is analyzed by using the finite difference numerical simulation software FLAC,and the instability mechanism is studied,the results show that①the instability of the slope is caused by the excess pore water pressure on the interface of rock layers,the pore water pressure of the slope reaches 4.0×10^(5) Pa,and the shear strength of the soil on the sliding surface decreases;②the failure of the slope starts from the foot of the slope,which belongs to traction type landslide.The slope factor of safety 0.89 and is in an unstable state.The research results have certain reference significance for the study of the mechanism of slope instability induced by rainfall.

关 键 词：边坡失稳 降雨 FLAC 孔隙水压 

分 类 号：TU432[建筑科学—岩土工程]