Finite Element Analysis of Ultra-deep Foundation Pit Covered Top-Down Excavation Based on PLAXIS

Abstract

The construction process of Xujiapeng ultra-large and ultra-deep foundation pit was simulated by finite element software Plaxis with the use of HSS soil constitutive model. The surface settlement around the foundation pit was "concave" shape and the settlement value was about 30mm. The diaphragm wall had a maximum deformation of 32.29mm to the direction of the internal under the overload, load of building and water and earth pressure. The foundation pit produced a slight distortion under the action of uneven load. A slight distortion occurred under the action of uneven load in the foundation pit.