基于局部强度折减法的含软弱结构层边坡稳定性分析

Stability Analysis of Slope with Weak Structural Layer Based on Local Strength Reduction Method

基于西南某智慧生态城中的不稳定斜坡,通过FLAC3D有限元软件建立数值模型,对比分析局部强度折减法与整体强度折减法计算边坡稳定性的差异,并研究不同加固方式对边坡稳定性的影响。结果表明:边坡的安全系数、变形等主要由软弱结构层控制,局部强度折减法更适用于含软弱结构层边坡稳定性研究;实例边坡在天然状态下处于稳定,在暴雨状态下存在滑坡风险;采用“锚杆+框格梁”与“抗滑桩+预应力锚索”分别加固五级边坡与直立边坡后,在暴雨状态下的边坡稳定性大幅提升。

Based on unstable slopes in a smart eco-city in the southwest,a numerical model was established using FlAC3D finite element software to compare the differences in calculation results between local strength reduction method and overall strength reduction method and the influence of different reinforcement methods on slope stability was studied.The calculation results show that the safety factor and deformation of slopes with weak structural layers are mainly controlled by the weak structural layers.The local strength reduction method is more suitable for the stability study of slope with weak structural layer.The slope example in this paper is stable in natural state,and there is landslide risk in rainstorm state;After the fifth grade slope and the vertical slope are strengthened by"anchor rod+frame beam"and"antislide pile+prestressed anchor cable"respectively,the stability of the slope in rainstorm is greatly improved.