Pump Test and Dewatering Control Methods for the Deep Excavation of a High-Speed Railway Station in Huai'an
The large-scale development and utilization of the urban underground space has made the excavation depth of founda-tion pits deeper and deeper.The pump test is particularly important for the deep excavation projects affected by the artesian wa-ter.A deep excavation project in the hub space of the Huai'an high-speed railway station is presented as a case history.A com-prehensive overview of the design,point arrangements,test methods and results of the pump test wells is presented.After that,the different estimation methods are used to compare and analyze the hydrogeological parameters of the excavated area,and the permeability coefficient and the radius of the influence of the main aquifer are determined.Finally,based on the water influx within the set depth of the excavated area,recommendations for a point well precipitation program are proposed in com-bination with the characteristics of the excavated area.The impact of the precipitation on the surrounding structures and the en-vironment is discussed and predicted in the paper.