超高压喷射搅拌成桩工法水平封底隔断承压水的施工

Construction of Horizontal Bottom Sealing of Confined Water by Ultra-high Pressure Jet Mixing Pile Construction Method

为解决某些特殊工况下,现场条件导致围护体系无法彻底隔断承压水层,基坑开挖又要求必须进行降水作业,导致基坑安全要求同周边环境保护要求之间的矛盾,介绍了一种运用超高压喷射搅拌成桩工法水平隔断承压水的施工技术。该技术运用于上海市某地铁车站工程中,成功隔断了不同层承压水之间的联系,确保了基坑安全,总结的经验可供类似工程参考。

In order to solve the contradiction between the safety requirements of the foundation pit and the environmental protection requirements of the surrounding area due to the inability of the foundation pit support system to completely isolate the confined water under certain special working conditions and the requirement of the foundation pit excavation to carry out dewatering operation,a construction technology for horizontal isolation of confined water by ultra-high pressure jet mixing piling method is introduced.The technique was applied to a metro station project in Shanghai,which successfully isolated the connection between different layers of confined water and ensured the safety of the foundation pit,and the summarized experience can be referred to similar projects.