以太原地铁二号线南内环街站深基坑为背景,针对太原地区独特的漫滩地质条件,采用有限差分软件FLAC3D对基坑开挖的全过程进行了模拟;同时采用正交试验研究了不同的支护参数(插入比,地下连续墙刚度,内支撑纵向间距)对河漫滩地区深基坑施工扰动的效应.研究结果表明:太原地铁车站深基坑施工过程中地表沉降最大值发生在距离基坑0.7H(H为基坑深度)的位置,开挖的影响范围大致在4H左右;将地下连续墙插入比控制在0.9~1.0,同时将最下面一道支撑尽可能靠近基坑底部对于控制基坑变形具有重要意义.%Based on the background of Nan-nei-huan Station on Taiyuan Metro line 2, the whole process of deep excavation and deformation features are studied by FLAC3D software.Considering the ratio of embedded depth, thickness of diaphragm wall and spacing of supporting systems, orthogonal test was adopted to analyze the deformation effect.The main conclusions as follows: the location of maximum ground settlement occurred is about 0.7H around the deep excavation edge;the effect range of excavation for surface subsidence is roughly 4H.It` s effective to set the ratio of embedded depth approach 0.9~1.0 and the lowest supporting near the bottom of the deep foundation pit.
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