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非贯通节理岩体是同时含有节理、裂隙等宏观缺陷及微裂隙、微孔洞等细观缺陷的复合损伤地质材料,基于此提出了在非贯通节理岩体动态损伤本构模型中应同时考虑宏、细观缺陷的观点。首先对基于细观动态断裂机理的经典动态损伤本构模型——TCK模型进行了阐述,其次针对目前节理岩体损伤变量定义中仅考虑节理几何参数而未考虑其强度参数的不足,基于能量原理和断裂力学理论推导得出了同时考虑节理几何及强度参数的宏观损伤变量(张量)的计算公式;第三,基于Lemaitre等效应变假设推导了综合考虑宏、细观缺陷的复合损伤变量(张量);第四,借鉴前人基于复合材料力学的观点,考虑了节理法向及切向刚度等变形参数对岩体动态力学特性的影响,进而建立了基于TCK模型的非贯通节理岩体单轴压缩动态损伤本构模型。并利用该模型讨论了载荷应变率、节理内摩擦角、节理厚度、节理法向及切向刚度和节理倾角等对岩体动态力学特性的影响规律。计算结果与目前的理论及试验研究结果比较吻合,从而说明了该模型的合理性。
The non-through-jointed rock mass is a composite damage geological material that contains macro-defects such as joints and fractures, mesoporosity defects such as micro-fractures and micro-cavities. Based on this, it is proposed that in the dynamic damage constitutive model of non-through jointed rock mass, Macro, meso-defect point of view. Firstly, the classical dynamic damage constitutive model based on the micromechanical dynamic fracture mechanics, the TTC model, is described. Secondly, in view of the fact that only the geometrical parameters of joints are considered in the definition of the damage variables of the jointed rock without considering the strength parameters, And the fracture mechanics theory, the formulas for calculating the macroscopic damage variables (tensor) which take into account the joint geometry and strength parameters are derived. Thirdly, based on the Lemaitre equivalent strain assumption, the composite damage variables (macro- Tensor) .Fourthly, based on the previous theory of composite mechanics, considering the effect of deformation parameters such as joint normality and tangential stiffness on the dynamic mechanical properties of rock mass, the non-through joint rock mass based on TCK model Uniaxial compression dynamic damage constitutive model. The effects of load strain rate, internal friction angle, joint thickness, joint normality, tangential stiffness and joint inclination on the dynamic mechanical properties of rock mass are discussed. The calculated results are in good agreement with the current theoretical and experimental results, which shows the rationality of the model.