In this paper we analyse the deformation of retaining pile and subsidence of ground and upward displacement and characteristic of side friction of anti-floating pile via the FLAC3 Dbased on modified cam-clay model

Nishihara model and improved Nishihara model under the pit which is located in the thick alluvial clay.By using the field test data

we anlysise the structural deformations.The conclusion is drawn that the Nishihara model can describe the horizontal displacement

because the model can calculate the creep deformatin of the clay.The modified camclay model can describe the subsidence of the ground behind the wall

because it can adjust the parameters of shear strength and elastic moulus.The Mohr-Coulomb model can track the upward displacement of pit bottom.In the condition of improved Nishihara model and modified Cam-clay model the calculated data is conservative.The conclusion can provide important guidance for the structure deformation in long run and prolong the service years.