基于PLAXIS的车辆荷载作用下基坑支护模拟研究

SIMULATION STUDY OF FOUNDATION PIT SUPPORT UNDER VEHICLE LOAD BASED ON PLAXIS

随着城市化进程的不断发展,呈现出车流量越来越大和基坑越来越深的趋势,交通主干道上行驶的车辆荷载会对邻近的基坑稳定性和安全性产生一定的影响。通过PLAXIS有限元软件进行不同车速、作用时间、作用距离的车辆荷载作用下基坑支护结构变形的影响研究,结果表明支护结构的最大水平位移和车速呈正比关系,且随着车速的增大其增幅越来越大;和作用距离呈反比关系,随着作用距离的减小而增大。同时车辆荷载的影响随作用时间有累积效应,累积到一定程度后不再变化。研究成果可为实际工程中车辆荷载作用时支护结构的稳定性分析和变形计算提供参考。

With the continuous development of urbanization, the trend of increasing traffic volume and deeper foundation pits is becoming more and more popular, the load of vehicles on the main roads of traffic will have a certain impact on the stability and safety of adjacent foundation pits. The PLAXS finite element software is used to study the influence of the deformation of the foundation pit under different vehicle load including different vehicle speeds,time of action and working distance. The results show that the maximum horizontal displacement of the supporting structure is proportional to the speed of the vehicle and increases larger and larger with the speed of the vehicle;it is inversely proportional to the action distance and increases with the decrease of the action distance. At the same time, the influence of vehicle load has a cumulative effect with the action time, and it does not change after accumulating to a certain extent. The research results can provide reference for the stability analysis and deformation calculation of the supporting structure during the vehicle load in actual engineering.