深基坑开挖过程中土体位移变化的模拟分析

Simulation Analysis of Soil Displacement During Deep Foundation Pit Excavation

在深基坑的开挖过程中,基坑中不同深度的土体会产生不同程度的位移。当位移的速率和幅度超过一定的限度时,基坑就有可能会坍塌。在研究过程中采用现场监测和模拟的方式来研究深基坑开挖过程中不同深度土体位移的变化规律。研究结果表明:随着深基坑开挖深度不断增加,土体水平位移在不断加大,并且同一节点处的水平位移也不断增大;在开挖过程中,基坑侧壁节点处的沉降量会不断增大,基坑底部因土体上部荷载卸去,会造成土体回弹现象。随着时间的流逝,坑底隆起将缓慢下降,转而基坑坑底变为中间低两边高的形状。对深基坑开挖过程中土体位移变化的研究可以为施工提供理论基础。

During the excavation of deep foundation pits,the soil with different depths will have different degrees of displacement.When the displacement rate and amplitude exceed a certain limit,the foundation pit may collapse.In the process of research,field monitoring and simulation are used to study the variation law of soil displacement at different depths during the excavation of deep foundation pits.The results show that the horizontal displacement of soil mass increases with the increase of excavation depth,and the horizontal displacement at the same node also increases with the increase of excavation depth.In the process of excavation,the settlement at the side wall node of the foundation pit will continue to increase,and the soil rebound will occur at the bottom of the foundation pit due to the removal of the upper load of the soil.With the passage of time,the pit bottom bulge will slowly decline,and then the pit bottom will become low in the middle and high on both sides.The study of soil displacement change during deep foundation pit excavation can provide a theoretical basis for constructions.