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基于运用霍普金森压杆(SHPB)装置对节理岩体动载试验得出的数据,从节理面倾角、贯通度、厚度、组数、填充物及应变率等不同方面分析各因素对节理岩体力学特性的影响,通过对节理岩体在高应变率下的损伤机制和破坏形式进行分析的基础上,基于复合损伤理论,对广义Bingham模型进行改进,构造了节理岩体材料在不同应变率下动态响应的本构模型,对模型计算和试验结果的比较表明,该模型能够很好地描述节理岩体动荷载下初始弹性变形阶段、稳态塑性变形阶段和加速变形破坏阶段的应力-应变关系,并且理论与试验结果吻合较好,从而证明了该模型的正确性和合理性。
Based on the data obtained from the dynamic loading test of jointed rock mass using Hopkinson pressure bar (SHPB) device, the factors that affect the jointed rock mass, such as joint inclination, penetration, thickness, group number, filling and strain rate, Based on the analysis of the damage mechanism and failure mode of jointed rock mass under high strain rate, based on the composite damage theory, the generalized Bingham model is improved, and the effect of the jointed rock mass under different strain rates The constitutive model of dynamic response is presented. The comparison between the model calculation and experimental results shows that the model can describe the initial elastic deformation stage, the steady-state plastic deformation stage and the stress-strain stage Relations, and the theoretical and experimental results agree well, which proves the correctness and rationality of the model.