降雨入渗下非饱和土质边坡稳定性分析

Analysis on the Stability of Unsaturated Soil Slopes under Rainfall Infiltration

为了研究降雨入渗对边坡稳定性的影响,基于饱和—非饱和渗流理论,分析边坡在降雨期和停雨期的孔隙水压力和体积含水量的变化,并对边坡的稳定性进行计算。结合算例,使用Geo-Studio软件分析了不同降雨强度和不同降雨持时对边坡稳定性的影响,以及边坡安全系数的变化。结果表明:当降雨强度分别为40 mm/d、80 mm/d时,降雨5 d安全系数降幅分别为18.72%和30.59%;当降雨强度为40 mm/d,降雨持续时间为10 d时,安全系数降幅为32.88%。降雨结束后,安全系数仍会继续下降,然后慢慢回升并趋于稳定。

In order to study the influence of rainfall infiltration on slope stability,based on the saturated unsaturated percolation theory,the changes of pore water pressure and volume water content of the slope in the rainfall period and after rainfall are analyzed,and the stability of the slope is calculated.Combined with the calculation example,the Geo-Studio software is used to analyze the influence of different rainfall intensity and duration on the slope stability,as well as the change of the factor of safety of the slope.The results show that when the rainfall intensity is 40mm/d and 80mm/d respectively,the 5-day factor of safety decreases by 18.72%and 30.59%respectively.When the rainfall intensity is 40mm/d,and the rainfall duration is 10d,the factor of safety decreases by 32.88%.After the rainfall,the factor of safety will continue to decline,then slowly rise and become stable.