敏感地区深基坑承压水控制技术研究

Study on Confined Water Control Technology of Deep Foundation Pit in Sensitive Area

为解决上海轨道交通14号线陆家嘴车站基坑开挖过程中可能面临的深层地下水安全管控难题,降低城市核心区深基坑开挖过程对周边环境的扰动影响,从承压水抗突涌设计、接缝止水型式及隔水帷幕施工工法比选等方面进行了研究。通过采用新型全方位高压喷射工法接缝止水及超高压喷射搅拌成桩止水帷幕实现了敏感地区深基坑承压水的有效管控。研究结果表明:相关承压水管控措施安全有效,极大地降低了深层承压水降排对周边环境的不利影响。

In order to solve the problem of deep groundwater safety control that may be met in the foundation pit excavation process of Lujiazui Station of Shanghai rail transit line 14 and reduce the disturbance impact of deep foundation pit excavation process on the surrounding environment in the urban core area,the design of confined water anti surge,the type of joint sealing,the comparison and selection of construction methods of water-stop curtain are studied.The effective control of confined water in deep foundation pit in sensitive areas is achieved by using a new omnidirectional high-pressure jet construction method,joint waterproof and ultra-high-pressure jet mixing pile water-stop curtain.The results show that the relevant confined water pipe control measures are safe and effective,which greatly reduces the adverse impact of deep confined water drainage on the surrounding environment.