宋二祥
    （清华大学土木系  北京 100084）

[提要]  讨论盾构法施工时隧道衬砌内力及其附近地表沉降的有限元计算。包括土工结构建造过程的有限元模拟方法，模拟隧道衬砌的Mindlin曲梁单元，施工过程中洞室超挖量的数值处理方法等。最后通过一实际问题的计算表明本文所建议方法是有效的，并讨论了一些有关的问题。
[关键词]  地下结构 隧道衬砌  内力变形分析 有限元法

This paper is concerned with the finite element analysis of shield tunnel for the deformation and internal forces in the surrounding soil and in the tunnellining. Curved Mindilin beam element is recommended to model the tunnel lining in order to ensure deformation compatibility between the lining element and the soil element. Numerical methods are presented to simulate the staged construction and to consider the influence of ground lost during the tunnel construction. Finally, a practical problem is analyzed to show the performance of the proposed numerical procedures.
Keywords: underground structure; tunnel Iining;deformation analysis;  finite element method