降雨入渗条件下土体水力特性对边坡稳定性的影响分析

Analysis of Influence of Soil Hydraulic Characteristics on Slope Stability Under Rainfall Infiltration Conditions

基于非饱和土土水特征曲线模型及非饱和强度理论,以某黄土边坡为例,采用GeoStudio软件建模模拟降雨入渗条件下土体水力特性参数对边坡稳定性的影响。结果表明,α值越大,相同降雨情况下边坡内部孔隙水压力升高的区域越大,雨水的入渗深度越大,边坡的初始安全系数越大,边坡的最小安全系数越小;n值越大,相同降雨情况下边坡内部孔隙水压力升高的区域越小,雨水的入渗深度越小,边坡的初始安全系数越小,边坡的安全系数变化量越小,但n值的变化并不决定最小安全系数。

Based on the unsaturated soil-soil-water characteristic curve model and unsaturated strength theory,taking a certain loess side slope as an example,Geostudio software was used to model the influence of soil hydraulic characteristic parameters on the slope stability under rainfall infiltration conditions.The results show that the greater the value ofαis,the greater the area where the pore water pressure is increased in the slope under the same rainfall,the greater the depth of the infiltration of rainwater is,the greater the initial safety factor of the slope is,and the smaller the minimum safety factor of the slope is.The greater the value of nis,the smaller the area where the pore water pressure rises in the slope under the same rainfall is,and the smaller the depth of rainwater infiltration is.The smaller the initial safety factor of the slope is,the smaller the change of the safety factor of the slope is,but the change of the value of n does not determine the minimum safety factor.