基于FLAC数值模拟的巧家县白泥沟滑坡稳定性分析

Stability analysis of Bainigou landslide in Qiaojia County based on FLAC numerical simulation

以巧家县白泥沟滑坡为研究对象,基于FLAC对大变形问题的计算优势,建立滑坡数值计算模型,模拟滑坡在自重、降雨及地震条件下的稳定性。首先,在自重和降雨条件下,模拟得到滑坡的安全系数分别为1.35和1.00,说明降雨使该滑坡的稳定性降低。同时对比分析两种工况下滑坡的位移及应力响应。地震工况模拟中,对地震波进行基线修正处理,考查地震作用对滑坡稳定性的影响。基于此,从位移、加速度和应力三方面分析在地震作用下滑坡的稳定性。最后,综合自重、降雨和地震三种工况下滑坡的稳定性,指出滑坡的薄弱位置,为滑坡防治提供借鉴和参考。

This paper takes Bainigou landslide in Qiaojia County as the research object.Based on computational advantages of FLAC for large deformation problems,a numerical model of landslide is established to simulate its stability under the conditions of self-weight,rainfall and earthquake.First,under the conditions of self-weight and rainfall,the safety factors of the landslide are 1.35 and 1.00 respectively,which shows that the stability of the landslide is reduced due to rainfall.At the same time,the displacement and stress response of landslides under the two conditions are compared and analyzed.In the simulation of earthquake conditions,the baseline correction of seismic motion is carried out to examine the effect of seismic action on landslide stability.Based on this,the stability of the landslide under earthquake is analyzed from displacement,acceleration and stress response.Finally,based on the stability of the landslide under the three conditions of self-weight,rainfall and earthquake,the weak position of the landslide is pointed out,which provides reference for the prevention of landslides.