WANG C, ZHANG P L, LI X R, et al.Dynamics characteristics of copper-bearing skarn under the combined action of axial compression and frequent disturbance after loading and unloading[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):29-37.

doi:10.16186/j.cnki.1673-9787.2022080022

Received:2022/08/12

Revised:2023/02/27

Published:2023/09/25

Dynamics characteristics of copper-bearing skarn under the combined action of axial compression and frequent disturbance after loading and unloading

WANG Chun1,2, ZHANG Panlong1, LI Xinru1, LI Jia1, HU Mangu1, LEI Binbin1, XIONG Hongwei1

1.School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:The dynamic mechanical tests of copper-bearing skarn under axial compression and frequent disturbance after loading and unloading were carried out by an improved SHPB device.The copper-bearing skarn at a depth of 900 m below the Dongguashan Copper Mine was taken as the research object，and the dynamic deformation characteristics，energy dissipation characteristics and failure modes were studied.The results showed that the deformation characteristics of copper-bearing skarn were not significantly affected by the dynamic loads generated by different impact air pressures.And the dynamic stress-strain curves of the rock samples were approximately parabolic.The peak stress of copper-bearing skarn decreased and the peak strain increased with the increase number of frequent disturbance number.The incident，inverse，transmitted and absorbed energy increased with the increase of impact pressure.The absorbed energy per unit volume increased by the increase of the incident energy，showing the process of absorbing energy.The internal damage degree of the rock samples increased by the increase number of frequent disturbance.Meanwhile，micro-cracks increased and the rate of expansion accelerated，which eventually led to the macroscopic damage of samples.The fragmentation of rock failure was affected and the probability of “rock burst” also increased.

Key words:cooper-bearing sharn;loading and unloading;axial compression;frequent disturbance;deformation characteristic;energy dissipation;failure mode

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