地铁车站基坑穿河道设计与应用

Design and application of subway station foundation pit undercrossing river channel

在轨道交通建设中,为减少征地拆迁、减少对公共绿地的占用,临河区车站考虑设置在河道范围时,应就建设项目对当地防洪排涝可能产生的影响作出评价,确保江河防洪安全。根据洪水影响评价报告提出的水系补偿要求,就地铁车站基坑穿河道处进行针对性设计以同时满足地铁安全施工和河道防洪排涝要求。以苏州轨道交通5号线木渎南站为工程案例,对该工程主体基坑采用了临时渡槽的水系补偿方案,保证了车站施工期间河道的防洪、排涝和引水功能,为工程节省了工期和投资。

In the construction of rail transit,in order to reduce land expropriation and demolition,and reduce the occupation of public green spaces,when considering setting stations within the river course in the riverside area,an evaluation should be made on the potential impact of the construction project on local flood control and drainage to ensure the safety of river flood control.According to the water system compensation requirements proposed in the flood impact assessment report,targeted design will be carried out for the subway station foundation pit crossing the river to meet the safety of subway construction and the flood control and drainage requirements of the river.Taking south Mudu subway station in rail transit line No.5 of Suzhou City as the engineering case,water compensation scheme of temporary aqueduct is adopted in the main foundation pit of the project,which ensures the functions of flood control,drainage and diversion of the river during the subway station construction period.Saving the project time and investment.