冲击荷载下煤岩破碎过程能量释放研究

doi:10.13722/j.cnki.jrme. 2021.0214

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Abstract In order to explore the energy release characteristics of rock fragmentation，impact compression tests with different strain rates and initial stress levels are carried out on coals by the Hopkinson pressure bar. In this paper，the elastic energy is calculated based on the dissipated energy of SHPB tests. The energy release characteristics are discussed under different confining pressures and strain rates. The effect of energy release on rock fragmentation is further investigated. The results show that：based on the energy evolution process，the dynamic stress-strain curve of coals can be divided into 5 stages under impact load. The obvious strain rate effect of coal was proved. The energy release lag effect was discovered in the process of rock failure. The elastic energy is released after the peak stress. As the strain rate increases，it is found that the elastic energy storage limit increases with quadratic polynomial and the elastic energy release stress increases linearly. The normalized value of release stress is found to increase linearly under uniaxial condition and decrease linearly under triaxial condition. With the increase of confining pressure，the strain rate dependence of release stress is weakened. The energy index W is put forward based on the release degree of elastic property. The effect of rock fragmentation can be reflected by W. The inverse relationship between W and fragmentation degree of coal rock was found. A new reference means for improving rock-breaking effect and preventing dynamic disaster are provided through W.

Key words： rock mechanics dynamic strain rate coal rock energy evolution energy release

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	LIU Xiaohui1
	2
	XUE Yang2
	ZHENG Yu2
	GUI Xin2

Cite this article:

LIU Xiaohui1,2,XUE Yang2, et al. Research on energy release in coal rock fragmentation process under impact load[J]. , 2021, 40(S2): 3201-3211.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme. 2021.0214 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3201

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