煤岩动力灾害预测的微电流技术及其应用研究

doi:10.13722/j.cnki.jrme.2021.0749

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Abstract To explore a new method for coal and rock dynamic disaster prediction based on weak current technique，field tests of weak current of coal mass in front of the mining face of a mine with rock burst risk were carried out using a self-developed weak current measuring device. The spatial distribution laws of weak current of the surrounding coal of the roadway and the response laws of weak current of the coal mass in front of the working face in the mining process were obtained. Combined with the information of microseismic events monitored，the precursory characteristics of coal instability or failure based on weak current responses were determined，and the feasibility for using the weak current method to predict coal and rock dynamic disasters was verified. The results show that the distribution of weak current in surrounding coal mass is almost consistent with the stress distribution，showing a trend of “increase-decrease-stable” from the roadway side to the deep of coal mass. Weak current responses well to the advancing process of the working face，showing a stepped increasing trend. Specifically，weak current increases gradually in the mining period while fluctuates stably in the stopping period. In addition，weak current could response to mining tremors in advance，and the acceleration of the current can be used as the precursor of mining tremors or coal failures. The weak current method has a wide application prospect in underground engineering due to its advantages of strong anti-interference ability，sensitive response and advanced disaster warning. However，the weak current method is still in the experimental stage，and the technique still needs to be further verified and improved through more field tests so as to provide technical support for accurate prediction of coal and rock dynamic disasters.

Key words： rock mechanics weak current instability and failure mine tremor precursory information coal and rock dynamic disasters monitoring and early-warning

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	Articles by authors
	LI Dexing1
	2
	3
	WANG Enyuan1
	YUE Jianhua2
	ZHANG Xin1
	WANG Dongming1
	JU Yunqiang4

Cite this article:

LI Dexing1,2,3, et al. A weak current technique for coal and rock dynamic disaster prediction and its application[J]. , 2022, 41(4): 764-774.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0749 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I4/764

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