煤冲击破坏的微破裂演化特征及前兆识别

doi:10.13722/j.cnki.jrme.2021.1100

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Abstract The impact tendency of coal and rock is an important factor of rockburst. Aiming at the microfracture development characteristics and precursor identification problems of impact tendency coal，the uniaxial compression test was carried out by the MTS testing machine. The characteristics of stress change，energy dissipation and dynamic deformation failure of impact tendency coal were studied by means of acoustic emission and high-speed camera. According to the temporal and spatial strong development law of coal micro fracture event in high-stress stage，the impact risk index was defined and applied to precursory identification. The results show that there is stepped sub failure behind the peak of impact prone coal. The greater the stress drop value and the stress drop rate of sub failure，the more intense the post peak impact failure. The microfractures of coal samples intersect with each other，resulting in the overall impact failure. There are many fracture nucleation areas in the coal sample，and the large-scale cracks (large energy events) in the areas are periodically accumulated and bred by many small cracks(small energy events). The concentration area of large energy events before the peak is basically consistent with the impact failure position after the peak. Near the plastic stress drop of coal and before the peak stress drop，the micro fracture events show instantaneous and strong localization characteristics，and the corresponding impact risk index exceeds 1，which can be used as an effective precursor index for the imminent macroscopic fracture (stress drop) of coal. The research results can effectively identify the precursory information of coal and rock fracture，and provide reference for the monitoring and early warning of coal rock disasters and rockburst.

Key words： mining engineering bump proneness acoustic emission microfracture time space and intensity parameters precursor identification

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	FENG Longfei1
	WANG Hao1
	WANG Xiaodong1
	ZHANG Quan2

Cite this article:

FENG Longfei1,WANG Hao1,WANG Xiaodong1, et al. Microfracture evolution characteristics and precursor identification of coal impact failure [J]. , 2022, 41(7): 1440-1452.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1100 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I7/1440

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