切坡角度及含水率对江西上饶黏土质边坡稳定性影响的有限元模拟

Finite Element Simulation of the Effect of Cut Angle and Water Content on the Stability of Slay Slope in Shangrao,Jiangxi

以上饶地区典型黏土质边坡为研究实例,利用ANSYS软件设计了3种模型分析在不同切坡角度和含水率条件下边坡稳定性。结果表明:(1)边坡在30°坡角,含水率28.54%状态下,安全系数为1.188 4,处于稳定状态(边坡失稳临界平衡安全系数为1.0),在自重作用下不易发生失稳滑移;(2)当边坡发生切坡作用时,边坡安全系数随切坡角度发生改变,当角度达到44°时,边坡处于失稳临界状态,大于这个临界角度,易发生失稳滑移;(3)受降雨影响,随着含水率不断增加,边坡安全系数呈降低状态,当坡角低于40°,含水率不高于31.5%时,边坡整体处于稳定状态;当坡角达45°及以上,含水率大于28.54%时,边坡失稳,而坡度为50°时,含水率只需超过23.6%,边坡便失稳滑移。

Using ANSYS software,taking the typical clay slope in Shangrao area as an example,three models are designed to analyze the stability of clay slope under different cutting angles and different water content conditions.The results show that:(1)When the slope angle is 30°and the water content is 28.54%,the safety factor of this clay slope is 1.1884,which is higher than the safety factor 1.0 of the critical equilibrium state of slope instability.This slope is in a stable state and no instability slip will occur under the action of self-weight;(2)When slope cutting occurs,the safety factor of this slope will change with the angle of slope cutting.When the angle of slope cutting reaches 44°,the slope is in a critical state of instability.If the angle of slope cutting is larger than this critical angle 44°,it is easy to have instability slip;(3)With the increasing water content of the clay slope,the safety factor of the slope decreases.When the slope angle is lower than 40°and the soil moisture content is less than 31.5%,the slope will be in a stable state.When the slope is 45°,the slope will become unstable when the water content is greater than 28.54%;while after 50°,the slope will slip only when the water content exceeds 23.6%.