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

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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.

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Acknowledgements

This work is supported by the State Key Research Development Program of China (2016YFC0801404), National Natural Science Foundation of China (51674254, 51674050), National Science and Technology Major Project of China (2016ZX05045004), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). We thank anonymous reviewers for their comments and suggestions to improve the manuscripts.

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Authors and Affiliations

  1. Department of Vocational and Continuing Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China

    Xiaoyan Song

  2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environmental Science, Chongqing University, Chongqing, 400044, China

    Xuelong Li

  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

    Zhonghui Li, Fuqi Cheng, Zhibo Zhang & Yue Niu

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  1. Xiaoyan Song
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Correspondence to Xuelong Li or Zhonghui Li.

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Responsible editor: Philippe Garrigues

Xuelong Li also as the co first author

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Song, X., Li, X., Li, Z. et al. Experimental research on the electromagnetic radiation (EMR) characteristics of cracked rock. Environ Sci Pollut Res 25, 6596–6608 (2018). https://doi.org/10.1007/s11356-017-1012-0

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