采用独立覆盖无网格法模拟盾构隧道衬砌结构

Simulation of the Shield Tunnel Based on the Independent Cover Meshless Method

本文将独立覆盖无网格法(ICMM,Independent Cover Meshless Method)应用于盾构隧道衬砌结构的分析模拟,以解决和避免采用梁-弹簧模型或实体有限元法常遇到的相应困难与难题.ICMM方法使用无网格节点进行任意形状分析区域的离散,在各离散节点的独立覆盖区域上采用多项式的无网格位移函数,具有前处理简单、公式简洁等优点,可以十分方便地实现盾构隧道衬砌、钢筋、接头螺栓、不同管片间的接触面等复杂构件的统一模拟分析,极大简化复杂盾构隧道的分析过程.论文详细介绍了ICMM方法进行盾构隧道分析的基本理论和各种基本构建的实现原理与公式,研制了相应的盾构隧道二维精细化荷载-结构分析程序,并通过算例验证了本文方法的正确性和可靠性.

In this paper, the Independent Cover Meshless Method （ICMM） is applied to the numerical analysis of shield tunnel lining, in order to solve and avoid the difficulties encountered by the beam-spring model and solid FEM model. The ICMM method, which uses nodes of Meshless Method to discrete the analysis area with arbitrary shape, employs the polynomial as the displacement function of the independent covers of nodes. Benefitted by its advantages of the convenient process and the concise formula, ICMM can make a comprehensive analysis of the lining, steel bar, bolt and the contact surfaces of joints conveniently, and as a consequence, simplify the processing of the analysis of shield tunnel greatly. In this paper, the basic theory and formulas of ICMM and the shield tunnel model are presented in details. In addition, a program of two-dimensional load-structnre model for shield tunnel is developed. The correctness and reliability of the proposed model are verified by an example.