Abstract：
3D elastic-plastic finite element simulation of typical foundation pit excavation process was produced, and the influence to Guangzhou metro line 4 was calculated. Based on the results of numerical calculation, the cubic spline function was used to differ-ential fitting to the longitudinal deformation of tunnel, and the curvature variation of each point was analyzed. In addition, the bending moment and girth open quantity of tunnel segment were solved by using the theory of equivalent continuous model. Result is found that both coincide.
