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Study on dynamic characteristics of pre-damaged rock under impact loading

机译：冲击载荷下预损坏岩石动态特性研究

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摘要

Rock often presents different damage state after repeatedly loading and unloading, The buckling destruction is closely related to the dynamic mechanical properties of damaged rock. Based on weakening and quantified expression of pre-damaged rock samples in different damage degree, The numerical simulation of impact tests using the Split Hopkinson Pressure Bar (SHPB) system under different loading rate is carried out and some basic parameters of HJC model are modified, Some parameters and change rules such as ultimate strength and ultimate strain along with the impact load of rock specimens are obtained and the relationship between the dynamic stress and deformation response is concluded. Compared with dynamic compression characteristics of intact rock, the dynamic compression strength and ultimate strain rate of pre-damaged rock are showed significantly reduction. The research conclusions can provide some theoretical basis for mechanism investigation of engineering disasters.
机译：岩石经常在反复装载和卸载后呈现不同的损伤状态，屈曲破坏与受损岩石的动态机械性能密切相关。基于不同损伤程度的预损坏岩石样本的弱化和量化表达，进行了在不同加载速率下使用分裂霍普金森压力棒（SHPB）系统的影响试验数值模拟，并修改了HJC模型的一些基本参数，获得了一些参数和改变规则，如极限强度和最终应变以及岩石样本的冲击载荷，结束了动态应力和变形响应之间的关系。与完整岩石的动态压缩特性相比，预损坏岩石的动态压缩强度和最终应变率显着降低。研究结论可以为工程灾害机制调查提供一些理论依据。

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