考虑降雨入渗效应的高边坡开挖数值模拟研究

Numerical Simulation Analysis of the Excavation of High Slopes Considering Rainfall Infiltration

基于FLAC 2D仿真计算软件,对某水利工程沿线易受降雨入渗影响而诱发滑坡的黄土边坡进行数值模拟,评估边坡稳定性安全系数受设计坡比和降雨入渗深度的影响程度。数值模拟结果表明,该高边坡的稳定性受到边坡形状和降雨入渗的影响非常明显,降雨入渗深度和坡比越大,稳定性安全系数越小;随着降雨入渗深度的增加,边坡应变场的塑性区不断从坡体深部向浅部发展,最终形成潜在滑动面;随着设计坡比的增大,边坡塑性区的形状越来越细长,同时也存在由深到浅的发展趋势。

Aiming at the landslide hazard of the loess slope in a water conservancy project,the influences of designed slope ratio and rainfall infiltration degree slope on the safety factor of slope are evaluated by numerical simulation based on FLAC 2 D software.The results show that the slope stability is greatly affected by the slope ratio and infiltration depth,and the greater the infiltration depth and slope ratio,the smaller the stability safety factor.The plastic zone continuously develops from the deep part of the slope to the shallow part with the increase of infiltration depth,and finally a potential sliding surface is formed.With the increase of designed slope ratio,the shape of slope plastic zone becomes more and more slender,and there is also a development trend from the deep part to the shallow part of slope.