苏州地区深基坑承压水降水风险分析与控制——以苏州地铁5号线竹园路站为例

RISK ANALYSIS AND CONTROL OF CONFINED WATER DEWATERING IN DEEP FOUNDATION PIT IN SUZHOU——TAKE THE ZHUYUAN ROAD STATION ON SUZHOU METRO LINE 5 AS AN EXAMPLE

随着苏州地铁网络的发展,地铁车站开始往26~30m以下的超深基坑进行发展。随着未来地铁6号线的开建,超深基坑将成为苏州地铁建设的主要施工方向。随着基坑深度的增加,承压水对基坑的安全影响越来越大,为了保证基坑安全,避免承压水常见危害流砂、管涌、突涌的发生,对于超深基坑承压水应将水位降至开挖面以下。在采用数值模拟进行降水设计的基础上,采取相应的技术措施来控制和减少承压水降水对基坑安全造成的风险。

With the development of Suzhou subway network, subway station began to be constructed in the super deep foundation pit that 26-30 meters below the surface. As the metro line 6 is about to open, super deep foundation pit will become the main building direction of Suzhou subway construction. With the increase of the depth of the foundation pit, the impact of confined water on the safety of the foundation pit is getting bigger and bigger, in order to ensure the safety of the foundation pit and avoid the occurrence of common hazards such as quicksand, piping and sudden welling, the level of underground water in the super deep foundation pit should be dewatered below the excavation surfac. Based on the design of foundation pit dewatering which used visual modflow, the corresponding technical measures are taken to control and reduce the safety risk of the confined water dewatering in the foundation pit.