论文部分内容阅读
岩石动态应变率对岩石动态变形过程具有极其重要的影响,因此,首先考虑岩石动态应变率对岩石强度的非线性影响特点,通过对现有岩石动态强度准则进行改进,建立反映应变率影响的非线性岩石动态强度准则,为岩石动态变形过程模拟方法研究奠定了坚实的基础;然后,采用本文非线性动态强度准则,在重点探讨考虑应变率影响的岩石微元强度度量方法基础上,引入统计损伤理论建立岩石动态统计损伤本构模型,并提出基于岩石动三轴试验曲线的模型参数确定方法,进而建立岩石动态变形过程模拟方法。它不仅能反映应力状态而且能反映应变率对岩石变形过程的影响;最后,通过与现有同类模型理论曲线以及相应试验曲线的比较分析,表明了提出模型与方法的合理性与优越性。
The dynamic strain rate of rock has an extremely important influence on the dynamic deformation process of rock. Therefore, considering the nonlinear influence of rock dynamic strain rate on rock strength first, by improving the existing dynamic strength criterion of rock, The dynamic strength criterion of linear rock lays a solid foundation for the research on the simulation of rock dynamic deformation process. Then, based on the nonlinear dynamic strength criterion of this paper, based on the measurement method of rock micro-element strength considering the effect of strain rate, The constitutive model of dynamic statistical damage of rock is established theoretically, and the method of determining the model parameters based on the dynamic triaxial test curve of rock is proposed. Then the simulation method of dynamic deformation of rock is established. It can not only reflect the state of stress but also reflect the influence of strain rate on the deformation process of the rock. Finally, the comparison with the existing theoretical curves and the corresponding test curves shows the rationality and superiority of the proposed model and method.