Study on the Evolutionary Characteristics of Acoustic–Magnetic–Electric Signals in the Entire Process of Coal and Gas Outburst

Jianchun Ou, Enyuan Wang (), Zhonghui Li, Nan Li, He Liu and Xinyu Wang
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Jianchun Ou: State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, China
Enyuan Wang: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Zhonghui Li: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Nan Li: State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, China
He Liu: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Xinyu Wang: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

Sustainability, 2023, vol. 15, issue 22, 1-16

Abstract: In recent years, with the continuous increase in the depth and intensity of coal mining, coal and gas outburst disasters pose a severe threat to the safe production of coal mines. Thus, this experiment studied the characteristics of electromagnetic radiation, acoustic emission, and electric potential signals during gas adsorption, stress loading, and the entire outburst process. The results indicate that during the adsorption process, different parts of the coal body exhibit variations in electric potential signals, electromagnetic radiation, and acoustic emissions. During the loading process, the consistency between the acoustic–electric signals and the load change rate is good, and at the moment of outburst, the acoustic–electric signals significantly increase with the ejection of coal and gas. Outbursts generally occur during the decline in electromagnetic radiation and acoustic emission signals, with the internal electric potential signal strength first decreasing then rapidly increasing and the surface electric potential directly rising. The closer to the outburst opening, the greater the change in signal amplitude. Based on the above experimental results, the outburst can be monitored through the acoustic–magnetic–electric precursory signal changes during the adsorption and loading processes, which is of great significance to the safety production and rapid excavation of coal mines.

Keywords: coal and gas outburst; acoustic emission; electromagnetic radiation; electric potential; spatiotemporal evolution (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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