Geomechanics and Engineering

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Regularity and coupling correlation between acoustic emission and electromagnetic radiation during rock heating process

  • Kong, Biao (Key Lab of Mine Disaster Prevention and Control, College of Mining ad Safety Engineering, Shandong University of Science and Technology) ;
  • Wang, Enyuan (Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology) ;
  • Li, Zenghua (Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology)
  • Received : 2017.05.04
  • Accepted : 2018.02.27
  • Published : 2018.08.10
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Abstract

Real-time characterization of the rock thermal deformation and fracture process provides guidance for detecting and evaluating thermal stability of rocks. In this paper, time -frequency characteristics of acoustic emission (AE) and electromagnetic radiation (EMR) signals were studied by conducting experiments during rock continuous heating. The coupling correlation between AE and EMR during rock thermal deformation and failure was analyzed, and the microcosmic mechanism of AE and EMR was theoretically analyzed. During rock continuous heating process, rocks simultaneously produce significant AE and EMR signals. These AE and EMR signals are, however, not completely synchronized, with the AE signals showing obvious fluctuation and the EMR signals increasing gradually. The sliding friction between the cracks is the main mechanism of EMR during the rock thermal deformation and fracture, and the AE is produced while the thermal cracks expanding. Both the EMR and AE monitoring methods can be applied to evaluate the thermal stability of rock in underground mines, although the mechanisms by which these signals generated are different.

Keywords

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