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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 the Suzhou Metro network, the subway station started to develop ultra deep foundation pit below 26-30m. With the construction of Metro Line 6 in the future, the ultra deep foundation pit will become the main construction direction for the construction of Suzhou Metro. With the increase of the depth of foundation pit, the influence of confined water on the safety of foundation pit is more and more large. In order to ensure the safety of foundation pit and avoid the common occurrence of confined sand, Water should be lowered to below the excavation face. Based on the numerical simulation of precipitation design, the corresponding technical measures are taken to control and reduce the risk to the safety of foundation pit caused by confined water precipitation.