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Geomechanics and Engineering Volume 22, Number 3, August10 2020, pages 255-264 DOI: http://dx.doi.org/10.12989/gae.2020.22.3.255 |
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The mechanism of rockburst-outburst coupling disaster considering the coal-rock combination: An experiment study |
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Feng Du, Kai Wang, Yangyang Guo, Gongda Wang, Liang Wang and Yanhai Wang
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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. | ||
| Key Words | ||
| coal-rock combination structure; coal-gas outburst; rockburst; coupling dynamic disaster; damage and failure; gas-solid coupling | ||
| Address | ||
| Feng Du, Kai Wang and Yangyang Guo: 1.) Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China 2.) State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing), Beijing 100083, China 3.) School of Emergency Management and Safety Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China Gongda Wang: School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China Liang Wang and Yanhai Wang: 1.) Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China 2.) State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing), Beijing 100083, China | ||