地连墙插入比对深基坑稳定性影响的数值模拟研究

Numerical Simulation Study on the Influence of the Earth Wall Insertion Ratio on the Stability of Deep Foundation Pit

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。

In the condition of construction method and support parameters remaining consist- ent, the insertion ratio of the wall was changed only. The numerical simulation software, FLAC3D,was used to analyze the stability of the foundation pit of Taiyuan City Subway Line No. 2 Center Street West station. The land subsidence, even the horizontal displacement of the wall and bottom heave were considered as indexes. The results show that： The wall insertion ratio has a certain effect on the surface subsidence, uplift and even the wall of the maximum horizontal dis- placement. With increasing insertion ratio, the maximum surface settlement and the maximum horizontal displacement decrease; the bottom uplift increases. When wall insertion is 0.7 -0.8, ground surface settlement decreases significantly, heave almost keeps unchangee,and the horizon- tal displacement of the wall is significantly reduced, which play a significant roll in maintaining the stability of the foundation pit. Therefore, this research it can provide evidence of insertion rati- o for deep foundation pit engineering in clay and silt soil areas.