English：

The Jinan West Station of Jinan Rail Transit Line 4 Phase I Project is in the spring-confinedwater area, and the confined water in the confined water area is generally distributed in loose strata. Dueto the large burial depth, high water head, large water volume in the confined water area, it is harmful tothe bottom plate of the deep foundation excavation and the construction of deep foundation excavation. Toensure the construction safety of the deep and large foundation excavation dewatering project of JinanWest Station, the 3D finite element model of the site-underground diaphragm-wall dewatering well isestablished to analyze the influence of the number, spacing and depth of dewatering wells on dewateringefficiency, and the optimal dewatering well layout scheme and the depth of underground diaphragm wallwere proposed. The research shows that the number and spacing of dewatering wells and the dewateringcapacity of single well have a direct impact on the dewatering efficiency in the foundation excavationdewatering project, and the diaphragm wall should be inserted into the confined water stratum in the siteas far as possible to isolate the hydraulic connection between the confined water stratum inside and outsidethe foundation excavation. Based on the research in this paper, it is suggested that two dewatering wellsshould be arranged on the cross section of the foundation excavation of the actual project, and a 40m deepdiaphragm wall should be adopted to control the adverse effects of confined water. Through the fieldmeasurement of foundation excavation dewatering, the reliability of the scheme is further verified.