武汉轨道交通七号线地铁站深基坑降水的特性研究

Research on the Characteristics of Water-reducing in Deep Foundation Pit of Subway Stations on Rail Transit Line 7 in Wuhan

结合武汉轨道交通7号线王家墩东站深基坑管井降水的工程实例,进行了基坑降水的相关设计计算。运用天汉降水软件对地铁站深基坑降水进行模拟分析,得到结论:基坑内的水位降幅在15.0~18.0m之间,水位基本降低到基坑最终开挖面下的1.0~2.5m。基于天汉降水软件,研究了回灌井的设置对基坑降水及周围沉降的影响,结果表明:设置了回灌井的基坑,地面沉降大小整体减小了3.0mm左右,回灌井附近沉降量的减少量能达到5.0~10.0mm。

Combined with the engineering case of water-reducing in the deep foundation pit pipe well of the Wangjiadun East Station on Rail Transit Line 7 in Wuhan,some relevant designs and calculations of water-reducing in the foundation pit was carried out.The Tianhan water-reducing software was used to simulate and analyze the waterreducing of this subway station,and it’s concluded that the water-reducing range is mainly between 15.0~18.0 m,and the water level is basically reduced to 1.0~2.5 m below the final excavation surface of the foundation pit.Then,through the Tianhan water-reducing software,the influence of the recharge well on water-reducing of the foundation pit and the near subsidence was studied.The results showed that the ground subsidence is reduced by about 3.0 mm as a whole when the foundation pit of the recharge well is set up,and the reduction of the subsidence near the recharge well can reach 5.0~10.0 mm.