考虑峰后能量非稳态释放的硬煤脆性度指标

doi:10.13722/j.cnki.jrme.2017.0523

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Abstract The post peak stress-strain curves of coal are often presented curved and benched drop. The current brittleness index expressed by gradient drop of compressive stress-strain cannot distinguish the linear，curved and benched drop. A new index to characterize the brittleness of hard coal based on unsteady energy release is thus proposed to overcome the problem. The brittleness of coal is the parameter characterizing the speed of energy release under the action of minute external energy in the post-peak stage. The mechanical and geometrical models of brittleness index were established according to the energy accumulation in pre-peak stage and the energy release in post-peak stage，which were validated theoretically and experimentally subsequently. Finally，the classification of bursting liability of coal according this index is studied. The results indicated that，compared with other indexes，this index can consider the longer nonlinear elastic phase of the hard coal，the shorter plastic and post-peak benched drop characteristics and so on.

Key words： mining engineering energy brittleness index stress-strain curves

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	Articles by authors
	HAO Xianjie1
	2
	3
	YUAN Liang4
	5
	GUO Yanding3
	LI Yulin3
	ZHAO YiXin3
	WANG Xinzhong3
	ZHU Guangpei3
	LU Zhiguo3
	REN Bo5

Cite this article:

HAO Xianjie1,2,3, et al. A new brittleness index for hard coal considering unsteady energy release at post-peak stage[J]. , 2017, 36(11): 2641-2649.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0523 OR http://www.rockmech.org/EN/Y2017/V36/I11/2641

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