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轴对称圆巷的弹塑性求解的关键是选择合适的屈服准则。已经有诸多学者选择Mohr-Coulomb准则、Drucker-Prager准则和Hoek-Brown准则等,进行了相应的求解。为了探讨更符合工程实际需要的准则和求解,在考虑岩石材料的应变强化效应的条件下,建立了轴对称圆巷的幂强化本构模型和基于Drucker-Prager屈服准则的幂强化-理想塑性模型,并进行了弹塑性求解。以工程实例为计算条件,将幂强化-理想塑性模型的计算结果与基于Mohr-Coulomb准则、Drucker-Prager准则的理想塑性模型和幂强化模型的计算结果分别进行了对比,分析幂强化参数对围岩弹塑性解的影响。研究表明,应变强化效应对围岩稳定性有较大影响,对于应变强化效应较强的岩石材料,采用幂强化模型分析更接近工程实际。
The key of elastic-plastic solution of axisymmetric round lane is to choose the appropriate yield criterion. Many scholars have chosen Mohr-Coulomb criterion, Drucker-Prager criterion and Hoek-Brown criterion and so on, and solved them accordingly. In order to explore the criteria and solutions that are more in line with the actual engineering requirements, the power-enhanced constitutive model of axisymmetric round alley and the power-enhanced-ideal plastic model based on the Drucker-Prager yield criterion are established under the strain hardening effect of rock materials. , And elastoplastic solution. Taking the engineering case as the computational condition, the calculated results of the exponentiation-ideal plasticity model are compared respectively with the calculated results based on the Mohr-Coulomb criterion, the Drucker-Prager criterion, and the exponentiation model. Effect of rock plasticity solution. The research shows that the strain hardening effect has a great influence on the stability of surrounding rock. For the rock material with stronger strain strengthening effect, the analysis of power intensification model is closer to the actual project.