Abstract：Research purposes: Dewatering from deep foundation pitwill certainly arouse the subsidence of surrounding environment. According to the condition that the deep foundation pitof the building of Tianjin West Station of Beijing-Shanghai High-speed Railwaywas adjacent to the existing railway line, a three -dimensional see page model was used to simulate the seepage field inside and outside the deep foundation pitand the effective dewatering design scheme was adopted to ensure the safety of excavation ofdeep foundation pitand the traffic of existing railway. At the same time, the monitored data on subsidence were analyzed for providing the reference to the similar works.
Research conclusions: In order to ensure rationality and validity of a dewatering design, the dewatering design must consider engineering geological conditions, hydraulic geological conditions and foundation bracing system to select reasonable hydrological parameters and make analysis of seepage flow with three -dimensional seepage mode.l The dewatering should be conducted strictly according to the dewatering design scheme with immediate dewatering and dynamic control to reduce dewatering depth ofpressure -bearingwater foreffective controlling the subgrade subsidence around the foundation pitasmuch as possible and ensuring the railway traffic.
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2010, Vol. 27 
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