Influence of Seepage on Deformation and Stress of Foundation Pit

The effect of seepage on the deformation and stress of foundation during excavation is studied,and the differences of deformation and stress because of the seepage.Foundation pit excavation and supporting procedure is programmed w ith Fish language,then the practical scenarios is simulated by FLAC3D.Numerical solution of horizontal displacement is separately solved w hen the seepage is considered or not.And comparative analysis of numerical solution and measured displacement values of the pit top is made.Then,the influence of seepage on the bump at the bottom of pit and on stress and strain of surrounding soil is analyzed.The results show that seepage may increase the horizontal and vertical displacement,at the same time the settlement of surrounding soil is increased.This is disadvantage for stability of foundation pit.The most obvious effect is increasing the horizontal displaces of the inner and out foundation pit.The horizontal force is increased because seepage increases vertical stress of the outer soil and decreases the stress of the inner soil.The paper realizes that influence of seepage should not be neglected.It concludes that horizontal displacement and bump of the bottom w ill be increased by seepage,as w ell as the settlement of the further ground and the horizontal force on the supporting structure of soil do.