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Three dimensional numerical simulation of groundwater seepage in deep foundation pit dewatering
Author(s): 
Pages: 22-25+30
Year: Issue:  7
Journal: Geotechnical Investigation & Surveying

Keyword:  deep foundation pit dewateringpartially penetrating wellthree-dimensional unsteady seepagenumerical simulation;
Abstract: The partially penetrated well in the Quaternary loose sediment in the middle-lower yangtze area is always used for deep foundation pit dewatering. Due to the curtain wall is difficult to reach the aquifer bottom, the groundwater flow field is extremely complex with three-dimensional unsteady flow characteristics. In this paper,taking the dewatering of pit excavation works in the tunnel repairing between Zhonghe village and Yuantong station in Nanjing metro as an example,based on deep pit seepage theories and methods of three-dimensional numerical simulation and the generalized hydrogeology model,the deep foundation pit dewatering 3D mathematical model in the area to simulate the presence of multilayer aquifer is developed,the ground water flow state is simulated under the different conditions,such as the aquifer deepest bottom reaches 56. 01m,a continuous water-resisting curtain of 44 to 47m deep,pumping wells of 40m deep,the buried filters depth of pumping wells up to 26 to 38m,dewatering to the depth of 26. 00m under the pit base etc. The optimal dewatering proposal is determined accordingly.
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