某超大基坑整坑设计分块实施的案例研究

Case Study on the Design of the Entire&the Implementation of Blocks of a Super-Large Foundation Pit

嘉兴火车站基坑位于人口密集的老城区,面积约3.3万m^(2),基坑形状不规则,周边环境和施工工序复杂。文章以该基坑项目为实例,详细介绍了1种整坑设计分块实施的基坑一体化设计方案。工程将基坑第1道支撑作为一个整体进行整坑设计,从第2道支撑往下再利用重力式挡土墙进行分块设计,并首次采用扶壁式挡墙作为基坑第2道支撑的转换支座,在施工组织和节省工期方面都取得良好的效果。

The foundation pit of Jiaxing Railway Station is located in the densely populated old city,with an area of about 33,000 m^(2).The shape of the foundation pit is irregular,and the surrounding environment&construction process are complex.Taking the foundation pit project as an example,it introduces in detail a design scheme for the integration of the entire pit design&block implementation.The project integrates the first support of the foundation pit as a whole,and uses gravity retaining walls for block design from the second support downwards.For the first time,a counterfort retaining wall is used as a conversion support for the second support of the foundation pit,which has achieved good results in construction organization&schedule saving.