Research on the Dewatering Technology in Trapped Area of Shield Launching Shaft for Water-rich Sand Stratum
XIONG Zhongmin1, QIN Zehong1, ZHANG Ziguang2, CAI Hong3
1. Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710000, China; 2. Anhui Key Laboratory of Architectural Structure and Underground Engineering, Anhui University of Architecture, Hefei, Anhui 230601, China; 3. China Tiesiju Civil Engineering Group,Hefei, Anhui 230041, China
Abstract：Research purposes:In view of the technical difficulties of dewatering for trapped shield launching shaft in water-rich sand layer in Huai′an, Jiangsu Province, it is necessary to improve the calculation model of water inrush from foundation pit, to obtain the calculation method of confined water in foundation pit of shield tunneling well in water-rich sand stratum. The dewatering scheme is designed according to the improved method. Research conclusions:(1) In consideration of two situations: confined water dewatering inside/outside foundation pit, the calculation method of water inrush and the dewatering funnel curve are respectively improved. (2) The scheme implemented by the improved method achieves the expected dewatering effect. The field measured data are consistent with the theoretical calculation and numerical simulation results, which verifies the rationality of the improved calculation method. (3) The effective implementation of improvement scheme for shield foundation pit of Huai'an Metro in Jiangsu Province can provide reference for dewatering of deep foundation pit with diaphragm wall enclosure structure in similar environment.
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XIONG Zhongmin, QIN Zehong, ZHANG Ziguang, CAI Hong. Research on the Dewatering Technology in Trapped Area of Shield Launching Shaft for Water-rich Sand Stratum. Journal of Railway Engineering Society, 2022, 39(1): 114-120.
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2022, Vol. 39 
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