基于强度折减弹塑性有限元法的抗滑桩加固边坡稳定性分析

以大型通用有限元分析软件ABAQUS作为平台，以迭代不收敛联合坡面特征点位移陡增作为抗滑桩加固边坡失稳判据，通过二次开发建立了能够自动搜索安全系数的抗滑桩加固边坡稳定性强度折减弹塑性有限元分析模型，结合典型算例的对比分析验证了这一判据的有效性。在此基础上，针对一实例边坡进行了稳定性数值分析。研究表明，对于抗滑桩加固边坡，以强度折减有限元法所确定的潜在滑动面，一般地比极限平衡法、极限分析上限方法要浅。

Stability analysis of slope reinforced with piles by using strength reduction FEM

By using elasto-plastic finite element method (FEM) based on the technique of shear strength reduction (SSR), stability of slope reinforced with piles against sliding and the behavior of stabilizing piles in slope are numerically analyzed. The criterion of iteration non-convergence conventionally used for assessing the instability state of slopes is combined with that of the uncontrolled displacement at a certain characteristic node on the slope surface to evaluate the limit-equilibrium state of pile-soil-slope system, and its validity is demonstrated through comparative studies for typical example. Furthermore, a typical case slope reinforced with piles is investigated through numerical analyses. The results show that the potential slip surface determined by SSR-FEM is shallower than that by limit equilibrium method and limit analysis method for a slope reinforced with piles.