大型地下钢筋混凝土岔管结构优化分析

本文根据岩体和混凝土衬砌联合受力特点，系统地提出了大型地下钢筋混凝土岔管结构优化分析方法。针对岔管空间几何特征，结合三维有限元的原理，提出了采用程序分析判断，自动生成各种不同类型的三维有限元地下钢筋混凝土岔管结构网格的计算方法。该方法只须输入几个关键的控制参数，便能自动剖分所须岔管网格，为大型地下钢筋混凝土岔管结构优化分析提供一种快速网格生成方法。根据岩体损伤开裂和弹塑性破坏特征，从岩体开挖应力扰动的塑性耗散能扩散理论和混凝土衬砌结构开裂损伤原理，提出了大型地下钢筋混凝土岔管结构型式优化的评估方法。通过对工程实例分析，证明该方法能综合反应地下钢筋混凝土岔管结构型式和参数选择以及岔管所处的地质环境和条件的影响，为优化地下钢筋混凝土岔管结构合理型式提供了一种有效的分析方法。

Optimization analysis of large-scale underground reinforced concrete branching conduit

Based on failure conditions of reinforced concrete and elastoplastic principle of rock energy dissipation, an optimization analysis method to assess best structure of large-scale underground reinforced concrete conduit is developed. The combined effect of surrounding rock and lining is considered. An automatic program to generate various 3-D finite element mesh of the branching conduit is introduced which can automatically judge and create 3-D FEM net when several control parameters of the structure are imported. The application of this method shows that it sufficiently responses the influence of geological condition, geological stress and parameters of the branching conduit structure. The method is convenient, flexible and high efficiency.