地铁车站基坑围护结构的施工监测与分析

Monitoring and Analysis of the Construction of the Envelope Structure of the Foundation Pit in the Subway Station

以郑州市地铁一号线西三环车站基坑为研究背景,通过对该基坑围护结构监测方案的设计,并对整个施工过程中围护结构桩体的水平位移、坑周地表竖向沉降以及钢支撑的轴力实施监测。监测数据分析表明:钢支撑能有效的减小围护结构的侧向变形;距离基坑越近,坑周地表沉降量也越大。总体来说,运用钢支撑联合钻孔灌注桩的围护形式稳定性良好,该围护结构的设计满足该工程的安全要求。

Combining with the foundation pit construction of the Xi San Huan stop of the No. 1 subway station in Zhengzhou, the design of the envelope structure of this foundation pit, the horizontal displacement of the piles of the envelope structure, the vertical settlement of the ground near the foundation pit and the axial force of the steel support were monitored. The monitoring data indicates that, first, the steel support can reduce the lateral deformation of the envelope structure; second, the vertical settlement of the ground is more serious near the foundation pit. In summary, the envelop structure of the steel support and the bored pile has a good stability, which shows that the design can meet the security requirement of the project.