煤冲击破坏过程规律及同源声电响应特征

doi:10.13722/j.cnki.jrme.2019.0130

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Abstract Aiming at rockburst monitoring and early-warning，laboratory loading and unloading tests on coal specimens with various loading rates were conducted，and the data of full-wave acoustic emission(AE) and electromagnetic emission(EME)，and the images showing the dynamic failure process of coal were respectively collected using an AE-EME synchronous collecting system with a sampling rate of 5 MHz and a high-speed camera with a sampling rate of 1 kHz. Combined with spectrum analysis，correlation analysis，AE velocity tomography analysis，energy analysis，etc，the response law of AE and EME to coal failure as well as the temporal and spatial evolution of coal bursting failure process was studied. The results show that both AE and EME have strong positive correlations with instantaneous stress drop，EME is synchronous with AE in the time serial and the spectrum distributions of EME and AE signals with a dominant low-frequency band are consistent with each other，which indicates that both AE and EME originate from crack-generating within the coal. It is also shown that the whole dynamic failure process of coal consists of several stages of bursting damage with violent ejection of broken coal material and that each stage is positively correlated with an instantaneous load drop. In the developing process of coal failure，there are good correlations among crack extension，stress distribution，energy release and AE location within the coal. Bursting failure is likely to occur in the area close to the free surface characterized by high stress concentration，dense cracks. This research provides a reference for the study of rockburst monitoring and early warning.

Key words： rock mechanics rockburst monitoring and early-warning failure behavior acoustic emission(AE) electromagnetic emission(EME)

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	Articles by authors
	LI Zhenlei1
	HE Xueqiu1
	DOU Linming2
	WANG Guifeng2
	SONG Dazhao1
	LOU Quan3

Cite this article:

LI Zhenlei1,HE Xueqiu1,DOU Linming2, et al. Bursting failure behavior of coal and response of acoustic and electromagnetic emissions[J]. , 2019, 38(10): 2057-2068.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0130 OR http://www.rockmech.org/EN/Y2019/V38/I10/2057

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