Abstract:This paper focuses on the soil seepage failure and the resulting instability of deep foundation pits caused by the excavation of deep foundation pits in coastal areas with high groundwater levels,conduct research on the influencing factors of foundation pit well-point dewatering based on numerical simulation methods.Based on the foundation pit engineering of Babao ship lock,a numerical model of foundation pit dewatering is established to analyze the effect law of the depth and permeability coefficient of water curtain,the depth and layout of dewatering well on the foundation pit pore water pressure and surface settlement.The results show that increasing the depth of the curtain can reduce the pore water pressure of foundation soil and the surface settlement.Reducing the permeability coefficient of the curtain can effectively block the seepage of groundwater into the foundation pit and reduce the surface settlement.With the increase of the depth of dewatering well,the pore water pressure of foundation pit decreases gradually,and the surface settlement increases continuously.The distance between the ground surface and the foundation pit gradually increases,and the ground settlement decreases first and then increases.The more the number of dewatering wells is,the smaller the pore water pressure of foundation pit is,the smaller the surface settlement is.The arrangement of three dewatering wells in the pit and one dewatering well outside the pit minimizes the surface settlement.
