Back Analysis of Seepage Parameters of Deep Foundation Pit Engineering of Subway Station under Complex Geological Conditions

Seepage parameter is an important evaluation index for the deep foundation pit engineering under complex geological conditions. The accurate measurement of seepage parameters is of great significance to the design of water-proof curtain and dewatering scheme. In this paper, based on the pumping test data of a metro pit in Foshan, the seepage parameters of the site's main aquifer were calculated by Qiu Buyi and hagelt theoretical formulas using a limited number of field drilling and pumping test data. Based on the groundwater numerical simulation method, the seepage parameters are inversely analyzed by using the Visual MODFLOW three-dimensional groundwater seepage simulation software. The seepage parameters obtained from the inversion analysis fit well with the field pumping test data. The seepage analysis of the deep foundation pit of the subway station by using the inversion analysis results has high reliability. The research results of this paper have a certain value for the deep foundation pit construction of similar subway stations in the Pearl River Delta.