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岩石类材料的动态本构模型研究是岩石动力学理论研究的基础问题。相比于其他的非线性理论,损伤力学理论已证实可成功地模拟岩石类材料的应变软化和渐进破坏等特征,可用于解释其静、动态破坏机制。现有的通过理论推导得出的动态本构中大部分并未考虑损伤因素,而通过维象学试验方法建立起的动态本构则缺乏损伤力学理论基础。为此基于弹性余能等效原理和损伤力学的基本概念,并结合动态试验,推导建立了岩石类材料的率相关弹塑性损伤模型。并通过与文献中的试验资料对比,证明了模型的有效性,为岩石类材料组成的结构的动力响应研究奠定了基础。
The dynamic constitutive model of rock-like materials is the basic problem of the study of rock dynamics. Compared with other nonlinear theories, damage mechanics theory has proved that it can successfully simulate the characteristics of rock-like materials such as strain softening and progressive destruction and can be used to explain the static and dynamic failure mechanisms. Most of the existing dynamic constitutive models derived from the theory do not consider the damage factors, while the dynamic constitutive model established by the method of the virial test lacks the theoretical basis of the damage mechanics. Based on the basic concepts of elastic residual energy equivalence principle and damage mechanics, combined with dynamic tests, a rock-based material-dependent elasto-plastic damage model is deduced. And compared with the experimental data in the literature, the validity of the model is proved, which lays the foundation for the study of the dynamic response of the rock-like materials.