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Environ Sci Pollut Res Int. 2018 Mar;25(7):6596-6608. doi: 10.1007/s11356-017-1012-0. Epub 2017 Dec 19.

Experimental research on the electromagnetic radiation (EMR) characteristics of cracked rock.

Author information

1
Department of Vocational and Continuing Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
2
State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environmental Science, Chongqing University, Chongqing, 400044, China. lixlcumt@126.com.
3
Key Laboratory of Gas and Fire Control for Coal Mines, National Engineering Research Center of Coal Gas Control, School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China. leezhonghui@163.com.
4
Key Laboratory of Gas and Fire Control for Coal Mines, National Engineering Research Center of Coal Gas Control, School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.

Abstract

Coal rock would emit the electromagnetic radiation (EMR) while deformation and fracture, and there exists structural body in the coal rock because of mining and geological structure. In this paper, we conducted an experimental test the EMR characteristics of cracked rock under loading. Results show that crack appears firstly in the prefabricated crack tip then grows stably parallel to the maximum principal stress, and the coal rock buckling failure is caused by the wing crack tension. Besides, the compressive strength significantly decreases because of the precrack, and the compressive strength increases with the crack angle. Intact rock EMR increases with the loading, and the cracked rock EMR shows stage and fluctuant characteristics. The bigger the angle, the more obvious the stage and fluctuant characteristics, that is EMR becomes richer. While the cracked angle is little, EMR is mainly caused by the electric charge rapid separates because of friction sliding. While the cracked angle is big, there is another significant contribution to EMR, which is caused by the electric dipole transient of crack expansion. Through this, we can know more clear about the crack extends route and the corresponding influence on the EMR characteristic and mechanism, which has important theoretical and practical significance to monitor the coal rock dynamical disasters.

KEYWORDS:

Coal and rock dynamic disasters; Cracked rock; Electromagnetic radiation; Failure type

PMID:
29255984
DOI:
10.1007/s11356-017-1012-0
[Indexed for MEDLINE]

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