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本文采用二维弹塑性有限元法,分析了一特大断面黄土隧道各个施工阶段以及建成后围岩和衬砌的受力状态。分析中采用增量弹塑性应力应变关系,Mohr-Coulomb屈服准则及关联流动法则,对于超出屈服面的应力进行调整,使之回到屈服面上。采用切线刚度法进行迭代计算,采用节点位移增量的收敛准则判断求解过程的收敛,每次迭代中采用高斯消元法求解体系的平衡方程。最后对支护结构进行了检算,提出了抑制隧道围岩变形的技术措施。
In this paper, the two-dimensional elasto-plastic finite element method is used to analyze the stress state of surrounding rock and lining after the construction of a large section loess tunnel and the completion of the tunnel. In the analysis, incremental elastic-plastic stress-strain relationship, Mohr-Coulomb yield criterion and associated flow rule are used to adjust the stress beyond the yield surface back to the yield surface. The tangential stiffness method is used to calculate the iteration, and the convergence of the incremental displacement of the node is used to determine the convergence of the solving process. The Gauss elimination method is used in each iteration to solve the equilibrium equation of the system. Finally, the support structure is checked, and the technical measures to restrain the deformation of tunnel surrounding rock are put forward.