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在施工方法和支护参数一定的条件下,只改变地连墙的插入比,运用FLAC3D数值模拟软件,以地表沉降、地连墙水平位移以及坑底隆起为指标,对太原市地铁2号线中心街西站基坑的稳定性进行了分析。结果表明,地连墙插入比的改变对地表沉降、坑底隆起以及地连墙的最大水平位移均有一定的影响;随着插入比的增大,地表沉降值和地连墙水平位移量降低,坑底隆起量增加;当地连墙插入比设置为0.7~0.8时,地表沉降减小显著,坑底隆起改变较小,地连墙的水平位移明显减小,基坑稳定性良好。研究结论可为黏土及粉土地区深基坑工程地连墙插入比提供依据。
Under the condition of certain construction methods and supporting parameters, only the insertion ratio of wall to wall was changed. Using FLAC3D numerical simulation software, taking surface subsidence, horizontal wall displacement and pit uplift as indices, The stability of foundation pit of Center Street West Station is analyzed. The results show that the change of ground-wall insertion ratio has a certain influence on the settlement of the ground surface, the bottom of the pit, and the maximum horizontal displacement of the ground wall. With the increase of the insertion ratio, the surface settlement value and the horizontal displacement of the ground wall are reduced , And the amount of bulge at the bottom of the pit increases. When the insertion ratio of local continuous wall is set to 0.7 ~ 0.8, the settlement of the ground surface decreases significantly, the change of the bottom of the pit changes little, the horizontal displacement of the wall of the ground wall decreases obviously, and the stability of the foundation pit is good. The conclusion of the study can provide a basis for the insertion ratio of the deep foundation pit in the clay and silt project.