Energy Dissipation of Rock with Different Parallel Flaw Inclinations under Dynamic and Static Combined Loading

Bing Dai, Guifeng Zhao, Lei Zhang, Yong Liu, Zhijun Zhang, Xinyao Luo and Ying Chen ()
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Bing Dai: School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
Guifeng Zhao: School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
Lei Zhang: School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
Yong Liu: School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
Zhijun Zhang: School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
Xinyao Luo: School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
Ying Chen: School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China

Mathematics, 2022, vol. 10, issue 21, 1-22

Abstract: Deep surrounding rocks are highly statically stressed before mining (excavating) and will inevitably experience disturbances from unloading, mining, stress adjustment or their combinations during mechanical or blasting excavation, which actually suffer from a typical coupled static-dynamic stress. A split Hopkinson pressure bar was used to carry out dynamic-static loading test on rock specimens with different fracture angles. The results show that the change law of energy utilization efficiency is similar to the energy absorption rate that they increase first and then decrease with the increasing of axial pressure. The elastic energy of specimens would also increase first and then decrease with the increasing of axial pressure, while the plastic energy generally decrease overall. Both the energy utilization efficiency and energy absorption rate increase with the growth of dynamic compressive strength under impact loading, which indicate that the energy dissipation exhibits a positive with the dynamic strength. The energy absorption density and energy utilization efficiency gradually increase linearly with the increasing of the average strain rate, while the relationship between energy utilization efficiency and incident energy basically follows the exponential function increasing law. The rock burst of pre-flawed rock is related to the static load level under dynamic-static loading, it occurs obviously under the action of medium energy when the axial pressure is high. Based on the energy dissipation theory, the damage variable model was further established, the damage variable can reasonably describe the damage evolution of crack granite under dynamic-static loading.

Keywords: SHPB tests; double-flaw rocks; dynamic and static combination; fractured rock; energy dissipation; damage variable (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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