中文摘要：

针对节理岩体同时含有节理、裂隙等宏观缺陷及微裂隙、微孔洞等细观缺陷的客观事实,提出了在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。为此,首先对基于细观动态断裂机理的经典岩石动态损伤本构模型—TCK（Taylor-Chen-Kuszmaul）模型进行了阐述,其次基于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）,进而在此基础上建立了相应的节理岩体动态损伤本构模型,并利用该模型讨论了载荷应变率及节理条数对岩体动态力学特性的影响规律。结果表明,在不同载荷应变率下试件在变形初始阶段是重合的,而后随着应变的增加,试件峰值强度、峰值应变及总应变均随载荷应变率的增加而增加;随着节理条数的增加,试件峰值强度逐渐降低,但降低趋势逐渐变缓并趋于某一定值。上述研究结论与目前的理论及实验研究结果的基本规律是一致的,说明了本模型的合理性。

英文摘要：

In view of the fact that the jointed rockmass contains both macroscopic flaws such as the joint and crack and the mesoscopic flaws such as the microcrack and microhole,the viewpoint that the above two kinds of flaws should be considered at the same time in the dynamic damage constitutive model of the jointed rockmass is proposed.Therefore,the rock classic dynamic damage constitutive model namely TCK model based on mesoscopic dynamic fracture mechanism is discussed,then the compound damage variable（tensor）comprehensively considering macroscopic and mesoscopic flaws based on Lemaitre equivalent strain hypothesis is deduced.Finally,the corresponding dynamic damage constitutive model is established,and the effect law of the load strain ratio and joint set on rock mass dynamic mechanical property is discussed with this model.The results show that under different load strain rates,the initial deformation stage of the samples coincides with each other,and then with increase of strain,the climax strength,strain and the total strain of the samples all increase.With increase in joint sets,the climax strength of the samples gradually decreases,but the reduction degree gradually becomes little and tends to a certain value.The basic law between the above research conclusions and the current experimental and theoretical results is the same,which demonstrates the rationality of this model.