降雨及地震作用下高边坡安全性数值模拟

Numerical simulation of high slope safety under rainfall and earthquake

为研究降雨及地震同时作用下公路边坡的稳定性响应机理,以某高边坡为工程背景,采用岩土模拟软件GeoStudio分析在降雨及地震耦合作用下的边坡稳定性。结果表明:1)当降雨强度为75、150 mm/d时,边坡最小平均安全系数分别为0.813、0.854;2)当地震加速度为0.2g、0.4g时,边坡最小平均安全系数分别为0.786、0.804;3)地震作用下边坡经历弹性变形、裂缝扩张及非线性变形3个阶段;4)雨水入渗导致表层岩土体抗剪强度降低以及地震动荷载造成的边坡内部岩土体开裂是边坡稳定性下降的主要原因,实际工程中应注意边坡的日常监测及防护。本文成果可为类似公路高边坡工程的日常灾害防治提供一点借鉴。

In order to research the stability response mechanism of highway slope under the simultaneous action of rainfall and earthquake,the geotechnical simulation software GeoStudio is used to analyze the slope stability under the coupling of rainfall and earthquake with a high slope as the engineering background.The results show that:1)When the rainfall intensity is 75 and 150 mm/d,the minimum average safety factor of the slope is 0.813 and 0.854,respectively;2)When the seismic acceleration is 0.2g and 0.4g,the minimum average safety factor of the slope is 0.786 and 0.804,respectively;3)Under the action of earthquake,the slope undergoes three stages:elastic deformation,crack expansion and nonlinear deformation.4)The main reason for the decline of slope stability is the reduction of the shear strength of the surface rock and soil caused by rainwater infiltration and the cracking of the rock and soil mass inside the slope caused by ground motion load.In the actual project,attention should be paid to the daily monitoring and protection of the slope.The results can provide some references for the daily disaster prevention and control of similar highway high slope projects.