渗流作用下利用有限元强度折减法的边坡稳定性分析

Analysis of Soil Slope Stability by Strength Reduction Element Method under Seepage

应用ADINA程序分析了天然情况下边坡的稳定性,得到了安全系数和滑面的位置,并与ANSYS以及传统条分法GEO-SLOPE程序的计算结果进行了对比;在渗流作用下,基于渗流方程和温度方程的原理,把温度场所对应的温度荷载转化为孔隙水压力荷载施加在稳定性分析的计算模型上,对边坡进行了稳定性分析。结果表明,采用该方法计算得到的安全系数与采用传统极限平衡法计算得到的安全系数相比,两者之间的误差在3%以内,说明利用温度场进行渗流计算,再采用有限元强度折减法来进行边坡的稳定性分析是可行的。

At present, the strength reduction FEM and some programs which are common internationally are used to analyze the slope stability. First, the location of phreatic surface in the slope under seepage is obtained by using the temperature module ADINA-T, which is popular in the world. And then, since the seepage equation and temperature equation are identical in principle, the temperature load resulted from the temperature module is transmitted into pore water pressure which is exerted on the calculation model of stability analysis. At last, the stability, is analyzed through the strength reduction FEM. The result shows that the error between the safety factors resolved by this method and the traditional ultimate equilibrium respectively is no more than 3%. It is concluded that the analysis of slope stability is feasible through seepage calculation of temperature module and strength reduction FEM.