Abstract：A new method for calculating geostresses in FEM analysis of underground houses is presented. With this method，a continuous displacement field and a reasonable geostress field can be obtained simultaneously to satisfy the compatibility equations and equilibrium equations，and the unexpected influence of the boundary restraints on the modeled region，which is required by FEM program，is avoided. The results of 3D nonlinear FEM analysis on Ertan project are given with this method.
1Ge Xiurun. Study on the tunnel axial deformation mechanism and numerical simulation of three-dimensional finite element method [A]. In: Liu H ed. Proc. of International Symposium ACMIRME[C]. Beijing：China Science and Technology Press，1993，1 009～1 016
2002, Vol. 21 
