Numerical analysis of 3D effect of a deep excavation

To investigate the 3D effect of deep excavation,2D and 3D finite element numerical methods were utilized to deal with 2D plan strain analysis and 3D analysis considering the support function of the left soil to the stability of the supporting system of the excavation,when the excavation was conducted by zones.In the analysis,the constitutive model of the soils is Mohr-Coulomb model.The numerical results show that when the supporting functions of the uncut soils,the lateral deflection of the diaphragm of the excavation will be decreased by 30%.Therefore,it is necessary to consider 3D effect in the analysis of excavation.