Study on Optimization Scheme of Deep and Large Foundation Excavation Dewatering in Spring-confined Water Area
The Jinan West Station of Jinan Rail Transit Line 4 Phase I Project is in the spring-confined water area,and the confined water in the confined water area is generally distributed in loose strata.Due to the large burial depth,high water head,large water volume in the confined water area,it is harmful to the bottom plate of the deep foundation excavation and the construction of deep foundation excavation.To ensure the construction safety of the deep and large foundation excavation dewatering project of Jinan West Station,the 3D finite element model of the site-underground diaphragm-wall dewatering well is established to analyze the influence of the number,spacing and depth of dewatering wells on dewatering efficiency,and the optimal dewatering well layout scheme and the depth of underground diaphragm wall were proposed.The research shows that the number and spacing of dewatering wells and the dewatering capacity of single well have a direct impact on the dewatering efficiency in the foundation excavation dewatering project,and the diaphragm wall should be inserted into the confined water stratum in the site as far as possible to isolate the hydraulic connection between the confined water stratum inside and outside the foundation excavation.Based on the research in this paper,it is suggested that two dewatering wells should be arranged on the cross section of the foundation excavation of the actual project,and a 40m deep diaphragm wall should be adopted to control the adverse effects of confined water.Through the field measurement of foundation excavation dewatering,the reliability of the scheme is further verified.
NETL
NSTL
万方数据
