Geomechanics and Engineering

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The mechanism of rockburst-outburst coupling disaster considering the coal-rock combination: An experiment study

  • Du, Feng (Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing)) ;
  • Wang, Kai (Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing)) ;
  • Guo, Yangyang (Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing)) ;
  • Wang, Gongda (School of Civil and Resources Engineering, University of Science and Technology Beijing) ;
  • Wang, Liang (Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing)) ;
  • Wang, Yanhai (Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing))
  • Received : 2019.11.07
  • Accepted : 2020.07.08
  • Published : 2020.08.10
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Abstract

With the ongoing development of deep mining of coal resources, some coal mine dynamic disasters have exhibited characteristics of both coal-gas outbursts and rockbursts. Therefore, research is required on the mechanism of rockburst-outburst coupling disaster. In this study, the failure characteristics of coal-rock combination structures were investigated using lab-scale physical simulation experiments. The energy criterion of the rockburst-outburst coupling disaster was obtained, and the mechanism of the disaster induced by the gas-solid coupling instability of the coal-rock combination structure was determined. The experimental results indicate that the damage of the coal-rock structure is significantly different from that of a coal body. The influence of the coal-rock structure should be considered in the study of rockburst-outburst coupling disaster. The deformation degree of the roof is controlled by the more significant main role of the gas pressure and the difference in the strength between the rock body and the coal body. The outburst holes and spall characteristics of the coal body after the failure of the coal-rock structure are strongly affected by the difference in strength between the roof and the coal body. The research results provide an in-depth understanding of the mechanism of rockburst-outburst coupling disasters in deep mining.

Keywords

Acknowledgement

This research is financially supported by the National Natural Science Foundation of China (51874314), the Chinese Postdoctoral Science Foundation (2019M660861), and the Yue Qi Distinguished Scholar Project, China University of Mining & Technology, Beijing.

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