某冲击地压频发工作面微震冲击前兆信息特征及预警方法研究

doi:10.13722/j.cnki.jrme.2020.0445

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Abstract As a common dynamic disaster of coal and rock，the prevention，monitoring and early warning of rockbursts are of great engineering significance. In order to improve the early warning ability of rockbursts in one working face，11 rockbursts occurred in the working face from May to August in 2018 were studied. Case study shows that，ten of the 11 rockbursts occurred in the roadway adjacent gob，that the rockbursts, affected by the static concentration stress generated by the superposition of the side pressure of the gob and the section coal pillar，occurred under the dynamic load disturbance caused by the large energy mine tremors，and that the microseismic(MS) energy and frequency can reflect the stress concentration degree and the dynamic load disturbance intensity and thus can be used for the monitoring and early warning of rockbursts. The evolution of the MS energy/frequency and their deviation values before and after the rockbursts was analyzed，and the time sequence law of MS precursors of rockbursts was obtained. It is shown that the MS energy and frequency before rockburst have obvious deviant trend characteristics with high deviation values，and the sum of the occurrence frequency of deviation high values of the MS energy and frequency in 7 days before a rockburst is at least two. A new quantity-trend rockburst risk early warning method based on daily MS maximum energy and the maximum occurrence frequency of deviation high values of the MS energy and frequency was then proposed. Specifically, the daily MS maximum energy is used for preliminary early warning，and then the final risk level is adjusted by the maximum of the occurrence frequency of deviation high values of the MS energy/frequency within 7 days. Comparative analysis of the early warning effectiveness between the new method and the original method used in the working face by R-score method shows that the R values by the two methods are respectively 0.673 and 0.072，which indicates that the new method is far superior to the original method. The new early warning method was applied to a mine in Xinjiang province and the R value reaches 0.652，which further verifies the effectiveness of the new method. The research results may provide some guidance for the monitoring and early warning of coal mine rockbursts.

Key words： mining engineering rockburst monitoring and early warning microseismic precursor quantity-trend

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	Articles by authors
	TIAN Xianghui1
	2
	LI Zhenlei1
	2
	SONG Dazhao1
	2
	HE Xueqiu1
	2
	JIAO Biao3
	CAO Anye4
	MA Yankun5

Cite this article:

TIAN Xianghui1,2,LI Zhenlei1, et al. Study on microseismic precursors and early warning methods of rockbursts in a working face[J]. , 2020, 39(12): 2471-2482.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0445 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I12/2471

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