Study on Dewatering Technology of Ultra-deep Foundation Pit in Opening Cut Section of Super-large Diameter Shield Receiving Well in River Island of Nanjing Yangtze River

Abstract:

The shield receiving well in Nanjing Yangtze tunnel is located at the river island; the excavation is mainly in fine sand layer and gravel sand layer. In the dewatering construction, a series of difficulties are successfully overcome, such as thick strong permeability formation, great influence of confined water, deep excavation depth, close distance from civil house to foundation pit, complex dewatering technology and difficult ground settlement control. In this paper, the study and summary are made on the design of foundation pit dewatering, construction process and ground settlement control.