在探索多场耦合理论基础上，研制出了一个考虑渗流场和膨胀变形对应力场作用的三维强度折减有限元程序。通过与传统极限平衡法分析结果进行对比研究，对抗剪强度折减有限元法分析边坡稳定问题的适用性进行了评价，得出采用三维强度折减有限元法确定考虑渗流场和膨胀变形的边坡稳定性安全系数是可行的结论。

The technique of the 3D finite element method(FEM) of coupling seepage, expanse and stress was studied, and the corresponding program for the FEM of strength reduction method was developed . Through comparison the FEM calculation with limit equilibrium, the applicability of FEM to analysing the slope stability was evaluated. The comparison result shows that the FEM method is feasible to analyze the stability of the slope considering seepage and expanse.