Characteristic study on seepage field in foundation pit under different cut-off wall

On basis of analyzing the saturated seepage theory,the seepage field in the foundation pit with different cut-off wall is simulated.The calculation results show that the influence of draining in the foundation pit on change of the outside underground water table gradually decreases with the increase of the height of cut-off wall and decrease of the permeability coefficient.And seepage discharge,vertical velocity and hydraulic gradient on the bottom of foundation pit all decrease along with the increase of the distance from the cut-off wall,but when decrease to some extent,they all gradually tend to stabilize.