基于ANSYS的边坡稳定性强度折减有限元分析

Strength Reduction Method in the FEA of Slope Stability Using ANSYS

介绍了一种基于有限元强度折减法的边坡稳定性分析方法,讨论了该方法的基本原理、安全系数的物理意义、屈服准则和流动法则的选用及边坡破坏的判据等。算例通过不断折减边坡强度参数,代入有限元程序进行边坡稳定性计算,直至计算不收敛时的折减系数即为边坡的安全系数。结果表明:随着折减系数的不断增大并达到某一数值时,边坡内塑性应变自坡底向坡顶逐渐贯通,边坡达到极限状态,此时的折减系数即为安全系数,有限元强度折减法对边坡稳定性分析具有良好的适用性。

The strength reduction method is used in the finite element analysis （FEA） of a slope stability problem. The basic principles of the strength reduction method, physical meaning of the factor of safety, yielding criteria, selection of flow rules as well as the criteria for the slope failure are introduced in this paper. As an example of applying this method, the soil strength parameters used in the FEA for the slope stability problem are progressively reduced until the FEA cannot converge. The strength reduction factor that caused the divergence of the FEA is the factor of safety of the slope analysis. When a slope rea- ches equilibrium, the plastic strain, which is initialized at the toe of the slope, approaches the top of the slope. The reduction factor used in the analysis when a continuous plastic zone is developed can be treated as the factor of safety.