基于动力强度折减法的地震边坡稳定性分析

目前关于动力作用下边坡稳定性的分析方法仍存在一些不足之处,如动力问题按静力处理、未充分考虑加载地震波的动力效应、仅考虑剪切破坏、未考虑边坡滑动面形成的渐进破坏过程等。鉴于此,本文同时考虑坡体拉剪强度参数的折减及边坡渐进破坏的过程,结合动力有限元强度折减法原理及边坡动力失稳判据,从监测点位移及加速度突变、计算数值收敛性及拉剪破坏面贯通情况3个方面,确定边坡的动力稳定安全系数及拉剪破坏面。结果表明:动力有限元强度折减法能够定量有效地进行地震作用下岩质边坡稳定性评价,并充分反映了边坡渐进破坏过程,其结果可为地震作用下岩质边坡的抗震设计及动力稳定性分析提供参考。

Seismic slope stability analysis based on dynamic strength reduction method

At present,there are still some deficiencies in the method of slope stability analysis under the present dynamic interaction. For examples, the dynamic problem was treated as a static problem, dynamic effect under loading seismic wave was not fully considered, only shear failure was considered, and the gradual failure process of the forming of slope sliding surface was not considered, etc. Therefore, both the reduction of slope shear strength parameters and slope progressive failure process would be considered in this paper. Combined with the dynamic finite element strength reduction principle and slope instability criterion, the slope dynamic stability safety factor and the tensile and shear failure surface were both determined from the monitoring point displacement and acceleration mutation, the convergence of numerical, and the penetration of tensile and shear failure surface. The results showed that, the dynamic finite element strength reduction method evaluated the rock slope stability under seismic action quantitatively and effectively, and fully reflected the gradual failure process. The results can provide references for seismic design of rock slope under seismic action and dynamic stability analysis.