地震作用下加筋土挡墙整体稳定性分析

Global Stability Analysis of Reinforced Soil Retaining Wall Under Earthquake

为研究软土地基上加筋土挡墙在地震作用下的稳定性,通过有限差分软件建立了高度为10 m的加筋土挡墙数值模型,并对其施加坡顶超载和地震荷载,分析了回填土黏聚力(0 kPa、5 kPa、10 kPa、15 kPa、20 kPa)、内摩擦角(25°、30°、35°、40°)、底部筋材长度(6 m、8 m、10 m、11 m、12 m、14 m)以及筋材位置对加筋土挡墙地震稳定性的影响。结果表明:加筋土挡墙的地震整体稳定性系数随墙后回填土的内摩擦角及黏聚力的增大近似线性增长;地震整体稳定性系数随着筋材布置间距的增大而减小,筋材应布置在边坡位移最大点位附近;地震整体稳定性系数随底部筋材长度的增加先升高后趋于稳定。

In order to study the stability of reinforced soil retaining wall on soft soil foundation under earthquake,a numerical model of reinforced soil retaining wall with a height of 10 m was established by finite difference software,and the slope top overload and seismic load were applied to it.The influence of backfill cohesive force(0 kPa,5 kPa,10 kPa,15 kPa,20 kPa),internal friction angle(25°,30°,35°,40°),length of bottom reinforcement(6 m,8 m,10 m,11 m,12 m,14 m)and position of reinforcement on seismic stability of reinforced soil retaining wall was analyzed.The results show that the overall seismic stability coefficient of reinforced soil retaining wall increases approximately linearly with the increase of internal friction angle and cohesion of backfill soil behind the wall;the overall seismic stability coefficient decreases with the increase of reinforcement spacing,and the reinforcement should be placed near the maximum displacement point of the slope;with the increase of the length of the bottom reinforcement,the overall seismic stability coefficient firstly increases and then tends to be stable.