基于有限元模拟法的某边坡稳定性分析

A Slope Stability Analysis Based on Finite Element Simulation Method

摘要: 以桂林市平乐县凤凰山滑坡为研究对象，在分析其工程地质条件与变形特征的基础上，采用ABAQUS有限元软件结合强度折减法，对四个典型剖面在天然与暴雨饱和工况下的稳定性开展数值模拟。结果表明，滑坡稳定性主要受顺向坡结构、软弱结构面、构造裂隙及坡脚开挖等因素控制。天然工况下，各剖面稳定系数介于1.01055~1.03446之间，整体处于欠稳定状态；暴雨工况下，稳定系数降至0.79616~0.87147，整体处于不稳定状态。研究认为，降雨是滑坡失稳的关键诱因，有限元模拟可较好地反映滑坡的变形破坏机制与稳定性变化规律。

Abstract: Taking the landslide in Fenghuang Mountain, Pingle County, Guilin City, as the research object, based on the analysis of its engineering geological conditions and deformation characteristics, numerical simulations of the stability of four typical profiles under natural and rainstorm-saturated conditions were carried out using the finite element software ABAQUS combined with the strength reduction method. The results indicate that the stability of the landslide is mainly controlled by factors such as the consequent slope structure, weak structural planes, tectonic fractures, and toe excavation. Under natural conditions, the stability coefficients of the profiles range from 1.01055 to 1.03446, indicating an overall unstable state. Under rainstorm conditions, the stability coefficients decrease to between 0.79616 and 0.87147, indicating an overall unstable state. The study suggests that rainfall is a key trigger for landslide instability, and the finite element simulation effectively reflects the deformation and failure mechanisms as well as the stability variation patterns of the landslide.