强降雨作用下风化混合花岗岩边坡稳定性分析

Stability Analysis of Weathered Mixed Granite Slope under Strong Rainfall

在西南地区的高速公路建设中存在大量的风化花岗岩,而目前对风化混合花岗岩的研究非常少。为了确保边坡安全,开展降雨诱发风化混合花岗岩边坡稳定力学机制研究。依托实际边坡工程,使用PLAXIS有限元分析软件,建立边坡有限元模型,分析均匀降雨和分时段降雨模式下以及不同渗透系数下边坡稳定性的变化情况。研究表明,当降雨量一定时,分时段降雨这种降雨模式对边坡稳定性系数的影响较大,且同等条件下渗透系数越大,边坡稳定性的下降就越少。

In the construction of expressway in southwest China,there are many weathered granites.While the study of weathered migmatite is very little at present.To ensure the safety of slope,the study of the mechanical mechanism of rain-induced stability of weathered migmatite slope has been carried out.Based on the actual slope engineering,PLAXIS finite element analysis software was used,the slope finite element model was established,the changes of slope stability is analyzed under different rainfall patterns and different permeability coefficients.The research shows that when the rainfall is constant,the rainfall in different periods has a greater impact on the slope stability.The greater the permeability coefficient,the more the slope stability will decline.