地震荷载作用下双面边坡稳定性数值模拟研究

摘要

采用二维有限元程序PLAXIS-2D,系统地研究了地震条件下双面边坡的地震响应规律,计算了地震前后边坡的滑裂面和安全系数.结果表明,地震后,双面边坡仍处于稳定状态;较陡侧(左侧)边坡有明显的滑动趋势,并带动较缓侧(右侧)边坡上部岩体共同剪切滑动;左侧边坡塑性点分布范围明显扩大,并贯穿到右侧较缓边坡4/5高处,造成右侧边坡局部岩体拉断破坏;地震后边坡安全系数仅有1.08,稳定性较差,远小于地震前的1.32;地震前后边坡滑裂面基本相同.%The two-dimensional finite element program PLAXIS-2D is used to systematically study the seismic response law of double-sided slope under earthquake conditions and the slip surface and safety coefficient of slope before and after earthquake are calculated.The results show that:(a) the double-sided slope is still in steady state after earthquake;(b) the steep side slope (left slope) has obvious sliding trend and drives the upper rock mass of slowly side slope (right slope) to appear shear sliding;(c) the plastic range of steep side slope expands significantly and run through to right slope at the position of 4/5 slope height,which causing the tensile failure of local rock in right slope;(d) after earthquake,the safety coefficient of slope is only 1.08,which is far less than the value of 1.32 before earthquake;and (e) however,the sliding surfaces are same after and before earthquake.