降雨入渗对土质边坡稳定性影响

Influence of Rainfall Infiltration on Soil Slope Stability

降雨是诱发边坡失稳的主要因素之一,为分析降雨强度和降雨历时对边坡稳定性的影响,文章采用GEO-STUDIO软件分析降雨强度和降雨持续时长对边坡孔隙水压力和边坡稳定性的影响。结果表明:边坡孔隙水压力随降雨持续时间的增大而先增大后保持不变。降雨历时在一定时长内会比较显著的影响边坡孔隙水压力的幅值,当超过这个范围对边坡孔隙水压力影响逐渐变弱,不同降雨强度下,边坡的稳定性系数随时间的增大而先减小后增大,降雨历时对边坡的稳定性表现出较强的初期失稳和雨停失稳现象。因此为了保证边坡的稳定,应加强雨中和雨后的边坡稳定监测。

Rainfall is one of the main factors to induce slope instability.In order to analyze the influence of rainfall intensity and duration on slope stability,GEO-STUDIO software is used to analyze the influence of rainfall intensity and duration on pore water pressure and slope stability.The results show that the pore water pressure first increases and then remains constant with the increase of rainfall duration.Rainfall duration will significantly affect the amplitude of pore water pressure in slope within a certain period of time.When the slope pore water pressure exceeds this range,the influence becomes weaker gradually.Under different rainfall intensity,the stability coefficient of the slope decreases first and then increases with the increase of time,and the rainfall duration has a strong initial instability and rain stop instability phenomenon on the stability of the slope.Therefore,in order to ensure the stability of slope,it is necessary to strengthen the monitoring of slope stability during and after rain.