针对盾构施工法的特点，提出一种简化的平面有限 元模拟方法，编制了相应的计算程序。该方法能够模拟盾构施工过程中的开挖，外层衬砌装 配、支护，内、外层衬砌共同承担水压力等整个过程。通过对某过河隧道工程实例的计算分 析，得出衬砌受力变形的基本特征，为盾构法隧道的衬砌设计提供参考。

Considering th characteristics of shield constructio n,a simplified twodimension FEM modeling is proposed and an appropriate calcul ation program is worked out in this paper.This mathematic model can simulate the whole construction process including the excavation by shielddriven,the assem bly of outside layer lining and its support,and in condition of the water pressu re together born by the inner and outer linings etc.Through calculation analysis of an engineering illustration,the basic characteristics of deformation of lini ngs generated from exerted forces are obtained.This program may be used for lini ng design of shield construction tunnels