邻近地铁车站对基坑地下连续墙位移的影响

Influence on Deformation Behaviors of Foundation Pit Adjacent to Existing Metro Stations

基坑工程的周边环境十分复杂,通常城市建筑空间有限,在基坑周围存在各种建筑物。文章基于PLAXIS有限元软件进行数值模拟,对不同参数组合下邻近地铁车站的基坑变形性状展开研究。结果表明:当邻近存在地铁车站时,靠近车站一侧的地下连续墙最大侧移量减小,另一侧的地下连续墙最大侧移量增加;基坑宽度的增加会引起基坑两侧的地下连续墙最大侧移量的相应增加,地铁车站与新建基坑距离较小时;随着开挖深度的增大,地铁车站的"遮拦效应"越来越显著。

The surrounding environment of the foundation pit is very complex, usually the urban building space is limited, and there are various kinds of buildings around the foundation pit. In this paper, based on the PLAXIS finite element software, the numerical simulation is carried out to study the deformation behavior of the foundation pit adjacent to the subway station under different parameters. The results show that when the adjacent existing subway station, underground continuous wall near the station side of the maximum lateral displacement decreases, the underground continuous wall on the other side of the maximum lateral displacement increases; pit width increase would cause a corresponding increase of underground continuous wall foundation pit on both sides of the maximum lateral displacement of the subway station, and the new pit distance is small; with the increase of the depth of excavation of subway station, the shielding effect is more significant.