By means of 3D-FEM, the process of undercrossing shield tunnel construction is simulated and the changing laws of displacement, deformation and internal forces of the existing tunnel are analyzed.

• 采用三维有限元方法对正交下穿盾构隧道施工进行模拟，分析新隧道动态掘进时既有隧道位移、变形和内力的变化规律。