关键词: 承压水, 深基坑, 抽水试验, 水文参数, 降水工程

Abstract: The large-scale development and utilization of the urban underground space has made the excavation depth of foundation pits deeper and deeper. The pump test is particularly important for the deep excavation projects affected by the artesian water. A deep excavation project in the hub space of the Huai’an high-speed railway station is presented as a case history. A comprehensive 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 combination with the characteristics of the excavated area. The impact of the precipitation on the surrounding structures and the environment is discussed and predicted in the paper.

Key words: Artesian Groundwater, Deep Excavation, Pump Test, Hydrological Parameters, Dewatering Project