车辆荷载影响下深基坑开挖稳定性分析

Analysis on the stability of deep foundation pit excavation under vehicle loads

为分析车辆荷载对深基坑开挖稳定性的影响,文章将车辆荷载分别等效为集中静荷载和均布条形荷载;以实际工程为例,使用Midas/GTS软件,分别建立集中静荷载、均布条形荷载及无车辆荷载作用下的深基坑开挖有限元模型,计算并分析该基坑的锚索应力、桩顶水平位移、基坑外地面沉降值,并与实际监测数据进行对比。分析结果表明:车辆荷载对深基坑开挖的稳定性是有一定影响的;基坑周边支护结构距离车辆荷载越近,支护结构的内力及水平位移受车辆荷载影响越大;将车辆荷载等效为集中静荷载,数值模拟结果与监测数据符合较好。文中分析结果可为类似基坑工程中考虑车辆荷载的影响提供参考。

To analyze the influence of vehicle load on the stability of deep foundation pit excavation, the vehicle load was equivalent to the concentrated static load and uniformly distributed strip load respectively. On the background of practical engineering, the finite element models of deep foundation pit excavation were built by Midas/GTS under the concentrated static load and uniformly distributed strip load and without vehicle load. The anchor axial force, horizontal displacement of the pile top and surface subsidence of the foundation pit were calculated and analyzed by comparing the calculated data with the monitoring data. It was shown that the vehicle load had a certain influence on the stability of deep foundation pit excavation;the vehicle load had a greater influence on the internal force and horizontal displacement of the support structure when the support structure surrounding the foundation pit got close to the vehicle load;the results obtained by numerical simulation in which the vehicle load was equivalent to concentrated static load agreed well with the monitoring data. The conclusion can provide a reference for studying the influence of vehicle load in the similar foundation pit engineering.