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Three-Dimensional Numerical Analysis of the Tunnel for Polyaxial State of Stress

机译：隧道多轴应力状态的三维数值分析

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摘要

The aim of this study is to have a comprehensive understanding of the mechanical behavior of rock masses around excavation under different value of intermediate principal stress. Numerical simulation was performed to investigate the influence of intermediate principal stress using a new polyaxial strength criterion which takes polyaxial state of stress into account. In order to equivalently substitute polyaxial failure criterion with Mohr-Coulomb failure criterion, a mathematical relationship was established between these two failure criteria. The influence of intermediate principal stress had been analyzed when Mohr-Coulomb strength criterion and polyaxial strength criterion were applied in the numerical simulation, respectively. Results indicate that intermediate principal stress has great influence on the mechanical behavior of rock masses; rock strength enhanced by intermediate principal stress is significant based on polyaxial strength criterion; the results of numerical simulation under Mohr-Coulomb failure criterion show that it does not exert a significant influence on rock strength. Results also indicate that when intermediate principal stress is relatively small, polyaxial strength criterion is not applicable.
机译：这项研究的目的是全面了解开挖过程中岩层在不同中间主应力值下的力学行为。使用新的多轴强度准则进行了数值模拟，以研究中间主应力的影响，该准则考虑了应力的多轴状态。为了用Mohr-Coulomb破坏准则等效地替代多轴破坏准则，在这两个破坏准则之间建立了数学关系。在数值模拟中分别应用了莫尔-库仑强度准则和多轴强度准则时，分析了中间主应力的影响。结果表明，中间主应力对岩体的力学行为有很大的影响。根据多轴强度准则，中等主应力增强的岩石强度是显着的； Mohr-Coulomb破坏准则下的数值模拟结果表明，它对岩石强度没有显着影响。结果还表明，当中间主应力较小时，不适用多轴强度准则。

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  • 来源
    《Mathematical Problems in Engineering》 |2015年第18期|301241.1-301241.8|共8页
  • 作者

    Qiu Wenge; Kong Chao; Liu Kai;

  • 作者单位

    Southwest Jiaotong Univ, Sch Civil Engn, Minist Educ, Key Lab Transportat Tunnel Engn, Chengdu 610031, Peoples R China.;

    Southwest Jiaotong Univ, Sch Civil Engn, Minist Educ, Key Lab Transportat Tunnel Engn, Chengdu 610031, Peoples R China.;

    Southwest Jiaotong Univ, Sch Civil Engn, Minist Educ, Key Lab Transportat Tunnel Engn, Chengdu 610031, Peoples R China.;

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