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    宋二祥
    （清華大學(xué)土木系  北京 100084）

[提要]  討論盾構(gòu)法施工時(shí)隧道襯砌內(nèi)力及其附近地表沉降的有限元計(jì)算。包括土工結(jié)構(gòu)建造過程的有限元模擬方法，模擬隧道襯砌的Mindlin曲梁單元，施工過程中洞室超挖量的數(shù)值處理方法等。最后通過一實(shí)際問題的計(jì)算表明本文所建議方法是有效的，并討論了一些有關(guān)的問題。
[關(guān)鍵詞]  地下結(jié)構(gòu) 隧道襯砌  內(nèi)力變形分析 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