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针对岩石动态变形特点,首先引进Kelvin模型研究思路与方法,将岩石变形过程中的动态应力视为静态应力分量与动态应力分量的叠加,分别以黏性元件和非线性元件模拟岩石单元的动态应力分量与静态应力分量,并建立出岩石动态应力的力学分析模型;然后在此研究基础上,利用黏性元件的力学特性和统计损伤理论分别建立出黏性元件和非线性元件变形过程模拟方法,进而得到岩石三轴动态变形过程模拟方法,并提出其模型的参数确定方法;最后通过实例分析与讨论,表明该模型不仅能反映岩石动态变形过程的应变软化特性,而且能较好地反映加载速度或应变率对岩石三轴动态变形过程的影响,具有较强的合理性和可行性。
According to the characteristics of dynamic deformation of rock, the idea and method of Kelvin model are firstly introduced. The dynamic stress in the process of rock deformation is regarded as the superposition of static stress component and dynamic stress component. The dynamic stress of rock element is simulated by viscous element and non-linear element respectively Component and static stress components and establish the dynamic analysis model of rock dynamic stress. Based on the above research, the simulation of viscous component and non-linear component deformation process is established by using the mechanical properties of viscous component and statistical damage theory respectively. Then the simulation method of the dynamic triaxial deformation of the rock is obtained and the parameters of the model are determined. Finally, the case analysis and discussion show that the model can not only reflect the strain softening characteristics of rock during dynamic deformation, but also reflect the loading speed Or strain rate on the rock triaxial dynamic deformation process, with strong rationality and feasibility.