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针对贯通节理岩体动态变形特点并结合已有岩石动态本构模型的相关研究成果,将贯通节理岩体变形过程中的动态应力视为贯通节理岩体静态应力分量与相应动态应力分量的叠加。其中贯通节理岩体静态应力分量采用考虑岩石细观损伤的非线性元件、节理面闭合及剪切变形元件等3个基本元件的串联来模拟,动态应力分量采用黏性元件来模拟,从而建立了贯通节理岩体动态单轴压缩损伤本构模型。其次,根据贯通节理岩体在单轴压缩荷载下往往会沿节理面发生剪切破坏的特点,在前述已建立的损伤本构模型中引人节理剪切破坏准则对该模型进行修正,从而更好地考虑了节理剪切强度对该模型的影响,最终建立了考虑节理剪切强度的贯通节理岩体单轴压缩损伤本构模型。最后利用该模型对贯通节理岩体在压缩荷载作用下的力学特性进行了分析计算,重点讨论了节理倾角对岩体单轴动态压缩峰值强度的影响规律。研究结果表明随着节理倾角的变化,节理岩体将发生岩块张拉或剪切破坏、沿节理面的剪切破坏及上述两种破坏模式的复合破坏,相应地节理岩体的单轴压缩动态峰值强度也随之有较大变化。
According to the dynamic deformation characteristics of jointed rock mass and the related research results of the dynamic constitutive model of existing rock, the dynamic stress in the deformation process of the jointed rock mass is regarded as the superposition of the static stress component and the corresponding dynamic stress component of the through jointed rock mass. Among them, the static stress components of the through-jointed rock mass are modeled by the series connection of three basic elements, including the nonlinear element considering the meso-damage of the rock, the joint closure and the shear deformation element, and the dynamic stress component is simulated by using the viscous element to establish Dynamic Uniaxial Compression Damage Constitutive Model of Through Rock Mass. Secondly, according to the characteristic that the through-going jointed rock mass will often shear along the joint surface under uniaxial compressive load, the model is corrected by introducing the joint shear failure criterion in the established damage constitutive model The effect of joint shear strength on this model is well considered, and finally the uniaxial compression damage constitutive model of through-jointed rock mass considering the joint shear strength is established. Finally, this model is used to analyze and calculate the mechanical properties of through-rock mass under compressive load. The influence of joint inclination on the peak uniaxial compressive strength of rock mass is discussed. The results show that with the change of joint inclination, the jointed rock mass will undergo the tensile or shear failure of rock mass, the shear failure along the joint surface and the composite failure of the above two failure modes. Correspondingly, the uniaxial compression of jointed rock mass Dynamic peak intensity also will have a greater change.