Simulation of seepage field in the foundation pit adopting cut-off wall

On basis of analyzing the solution method of saturated seepage in soil by finite element method,the seepage field in the foundation pit with different cut-off walls is simulated.The calculation results show that the influence of the draining in the foundation pit on the change of the underground water table outside the pit gradually decreases with the increase of the height of the cut-off wall and the decrease of the permeability coefficient.And the seepage discharge,vertical velocity and hydraulic gradient at the bottom of the foundation pit all decrease along with the increase of the distance from the cut-off wall,but when decreasing to some extent,they all gradually tend to be stable.Meanwhile,the dimension of the calculation model will influence the calculation result,but with the increase of the dimension,its influence will become less and less.