基于Midas非饱和土边坡降雨稳定性分析

Rainfall Stability Analysis of Unsaturated Soil Slope Based on MIDAS

基于Midas GTS,应用强度折减法对基坑边坡降雨影响下的稳定性进行分析.本文采用新乡市文旅城某基坑的相关土体数据,将基坑边坡的几何形状和土层条件转化成相应的参数模型,利用CAD构建二维模型并导入Midas,通过改变地下水水位、降雨持时和降雨强度,并进行施工阶段分析,将得到的基质吸力和安全系数进行对比.研究结论显示:降雨下边坡基质吸力最大值逐渐下移,强降雨条件下安全系数先增后减直至失稳,地下水位越高其安全系数越小,稳定性越差.

Based on MIDAS GTS,the strength reduction method is applied to analyze the slope stability under the influence of rainfall.According to the relevant soil data of a foundation pit in Xinxiang culture and tourism city,this paper transforms the geometric shape and soil conditions of the foundation pit slope into an appropriate parameter model,uses CAD to build a two-dimensional model,and imports it into Midas.By changing the groundwater level,rainfall duration and rainfall intensity,and analyzing the construction stage,the matrix suction and safety factor are compared.The results show that:under the condition of rainfall,the maximum value of matric suction of slope gradually moves down,and under the condition of heavy rainfall,the safety factor first increases and then decreases until instability.The higher the groundwater level is,the smaller the safety factor is and the worse the stability is.