降雨和地震共同作用下高填方边坡稳定性研究

Research on the Stability of High Fill Slope Under the Combined Action of Rainfall and Earthquake

为研究降雨和地震共同作用对高填方边坡稳定性影响,利用降雨时长、降雨强度,以及地震加速度3个主要因子进行叠合分析,基于GeoStudio数值软件进行稳定性分析计算,并采用正交试验法对因素敏感性进行评价。结果表明,降雨主要影响边坡浅层土体孔隙水压力,降雨强度和时间对高填方边坡稳定性影响程度有限;地震作用对边坡稳定影响很大,边坡稳定系数随地震峰值加速度增大而降低;降雨和地震共同作用下,填方边坡稳定性明显小于降雨或地震单一作用,叠合作用效果明显;在考虑的边坡稳定性影响因素中,地震作用影响最大,降雨时间次之,降雨强度最小。

In order to study the combined effect of rainfall and earthquake on the stability of high fill slopes,a composite analysis was conducted using three main factors with rainfall duration,rainfall intensity,and seismic acceleration.Stability analysis calculations were conducted using GeoStudio numerical software,and the sensitivity of the factors was evaluated using orthogonal experimental method.Research has shown that rainfall mainly affects the pore water pressure of shallow soil on slopes,and the impact of rainfall intensity and time on high fill slopes is limited.Earthquake action has a significant impact on slope stability,and the slope stability factor decreases with the increase of earthquake peak acceleration.Under the combined action of rainfall and earthquake,the stability of the fill slope is significantly smaller than that of the single effect of rainfall or earthquake,and the combined effect is significant.Among the factors affecting slope stability,earthquake action has the greatest impact,followed by rainfall time and rainfall intensity.