基于ABAQUS数值模拟法降雨条件下的边坡稳定性分析

Slope Stability Analysis under Rainfall Conditions Based on ABAQUS Numerical Simulation Method

针对现场勘察常见的滑坡问题,文中以室内试验测定的力学参数为基础,通过ABAQUS模拟软件建立滑坡地质力学模型,研究滑坡过程中力学特性,针对天然情况以及暴雨状态下边坡的稳定性以及滑动区岩土体的位移场、塑性区进行边坡的稳定性分析。结果表明,以坡顶处位移突变和塑性区是否贯通为评价标准时,边坡稳定安全系数最贴近实际工况,降雨后的安全系数急剧下降说明边坡有必要进行支护。

In view of the common landslide problems in the field survey,based on the mechanical parameters measured in the laboratory test,the geological and mechanical model of the landslide was established through ABAQUS simulation software,and the mechanical characteristics in the landslide process were studied.The stability of the slope under natural conditions and rainstorm conditions,as well as the displacement field and plastic zone of the rock and soil mass in the sliding zone,were analyzed for the stability of the slope.The results show that the Factor of safety of slope stability is most close to the actual working condition when the sudden change of displacement at the top of the slope and whether the plastic zone is connected are the evaluation criteria.The sharp decline of the Factor of safety after rainfall indicates that the slope is necessary to be supported.