基于塑性力学极限法的赵树岭滑坡稳定性分析

摘要

It is assumed that sliding surface of landslide achieves the plastic limit state when it is in the state of ex⁃treme sliding based on plastic mechanics and limit analysis theory. All of the sliding surface and vertical planes of slope change part of sliding surface are all velocity discontinuity surfaces. On this basis, internal and external force power balance equation is established by the principle of virtual work, and then the expression of landslide’ s factor of stability is obtained based on the plastic limit analysis. The Zhaoshuling landslide in the three gorges reservoir re⁃gion is selected as the case study, and the factor of stability of the Zhaoshuling landslide is 1.14 according to the plastic limit analysis method, the calculation results show that Zhaoshuling landslide is generally stable, but the sta⁃bility is not very enough.%基于塑性力学和极限分析理论，假设坡体处于极限滑动状态时，滑动面各处的岩土体均达到塑性极限状态，各段滑动面以及滑动面斜率改变处的竖直平面，都是速度间断面。在此基础上，通过虚功原理建立内外力功率平衡方程，由此求得基于塑性极限分析法的滑坡稳定性系数表达式。选取三峡库区赵树岭滑坡作为分析实例，根据塑性极限分析法的稳定性系数为1．14，计算结果表明赵树岭滑坡总体稳定，但稳定性富裕度不高。