Abstract

In this work, the stability of a shield tunnel face under pore water pressures is examined by combining the non-linear Mohr-Coulomb failure criterion in the framework of the kinematic approach of limit analysis. The non-linear Mohr-Coulomb failure criterion represented by the tangent technique in combination of the pore water pressure distribution calculated by the mesh dividing optimization technology are incorporated into the 3D rotational failure mechanism to assess the critical support pressure of a tunnel face for the first time. Based on the proposed method, parametric studies are performed by giving design charts to study the effect of model parameters on the calculated critical support pressure. In these charts, comparisons with results from the linear Mohr-Coulomb failure criterion are used to verify the proposed method. Finally, the influence of the non-linear coefficient on the feature of the 3D rotational failure mechanism is presented.

摘要

在这项工作中，通过结合非线性 Mohr-Coulomb 破坏准则在极限分析的运动学方法的框架下检查盾构隧道工作面在孔隙水压力下的稳定性。以切线技术为代表的非线性Mohr-Coulomb破坏准则结合网格划分优化技术计算的孔隙水压力分布，并入3D旋转破坏机制，首次评估了隧道掌子面临界支护压力时间。基于所提出的方法，通过给出设计图来进行参数研究，以研究模型参数对计算的临界支撑压力的影响。在这些图表中，与线性 Mohr-Coulomb 失效准则的结果进行比较来验证所提出的方法。最后，