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软土地区深基坑工程往往受到地下水影响,很多基坑工程事故都是由于地下水的影响引起的。本文通过大型非线性有限元软件Abaqus,采用渗流应力耦合理论及修正剑桥模型,并考虑连续墙与土体的接触作用,结合实际工程分析了基坑工程变形情况,并与不考虑渗流影响下基坑变形情况以及实测情况进行对比,主要包括地下连续墙变形、地表沉降及坑底回弹。发现两种分析条件下基坑变形形态基本一致,但耦合分析基坑变形大于非耦合分析,更接近实际情况,认为渗流对基坑变形的影响不容忽视,对实际工程应用有一定意义。
Deep foundation pit projects in soft soil area are often affected by groundwater, and many pit excavation accidents are caused by the influence of groundwater. In this paper, through the large-scale nonlinear finite element software Abaqus, the seepage stress coupling theory and the modified Cambridge model are adopted, and the contact between the continuous wall and the soil is considered. Based on the actual engineering, the deformation of the foundation pit is analyzed, Pit deformation and the measured conditions are compared, including the diaphragm wall deformation, surface subsidence and bottom rebound. It is found that the deformation patterns of foundation pit are basically the same under the two kinds of analysis conditions. However, the deformation of the foundation pit is larger than that of the uncoupled analysis, which is closer to the actual situation. It is considered that the influence of seepage on the deformation of foundation pit can not be neglected, which is of certain significance for practical engineering application.