太原地铁车站基坑变形规律三维数值模拟研究

3D Numerical Simulation Analysis on the Deformation of Deep Foundation Excavation of Subway Station in Taiyuan

针对太原漫滩地质下基坑工程中所存在的地下水位高、开挖面积大、变形控制等级高等问题,通过对车站基坑开挖全过程进行三维数值仿真,并对基坑边角部位和中间部位变形进行对比分析,揭示了太原漫滩地区深基坑变形的基本规律:该地区墙后地表沉降表现为明显的凹槽形,空间效应显著,开挖过程中墙后地表局部隆起,提前降水和采用强支护可以提高基坑的整体稳定性。最后给出太原漫滩地区深基坑工程墙后地表沉降预估曲线。

In order to solve the problems like high underground water level,the excavation of large area and high level of deformation control of deep foundation excavation in the process of subway station construction in Taiyuan,3D numerical simulation is used in the whole process of deep foundation excavation and the contrastive deformation analysis of edges and middle parts of subway station foundation excavation. By this,the basic law of deformation of subway station foundation excavation in Taiyuan floodplain area was revealed as follows： ground surface displacement behind the enclosure wall shows obvious groove,the spatial effect of subway station foundation excavation is remarkable,local area shows rising in the process of excavation,early drainage and the strong support can improve the stability of the deep foundation excavation. Finally,the ground surface prediction displacement curve of deep foundation excavation engineering after the enclosure wall was given in Taiyuan floodplain area.