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基于以D-P准则为屈服函数建立的弹塑性本构模型,利用有限元数值模拟软件COMSOL Multiphysics对巷道围岩的稳定性进行了数值模拟,分析了巷道围岩的应力、位移分布情况,对比了以Mohr-Coulomb准则和D-P准则为屈服函数时巷道围岩的塑性区分布,探讨了巷道围岩的失稳破坏形式。研究表明,以Mohr-Coulomb准则为屈服函数时可能会低估巷道围岩塑性区分布范围;巷道两帮首先发生拉伸破坏,随后发生剪切破坏,最终形成X状共轭剪切破坏。
Based on the elasto-plastic constitutive model established by DP criterion for the yield function, the stability of the surrounding rock of the roadway is numerically simulated by finite element numerical simulation software COMSOL Multiphysics. The stress and displacement distribution of the surrounding rock is analyzed. The Mohr-Coulomb criterion and the DP criterion are the plastic zone distribution of the surrounding rock in the yield function, and the failure forms of the surrounding rock in the tunnel are discussed. The results show that the Mohr-Coulomb criterion may underestimate the plastic zone distribution of surrounding rock; the tensile deformation of the two sides of the roadway occurs first, then the shear failure occurs and finally the X-shaped conjugate shear failure occurs.