Mechanism investigation on coal and gas outburst: An overview

• Published in: International journal of minerals, metallurgy and materials Vol. 27; no. 7; pp. 872 - 887
• Main Authors: Ma, Yan-kun, Nie, Bai-sheng, He, Xue-qiu, Li, Xiang-chun, Meng, Jun-qing, Song, Da-zhao
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.07.2020; Springer Nature B.V; State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China%State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China; School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 10083, China%State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China; Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China%School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 10083, China; Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China; Xinjiang Institute of Engineering, Urumqi 830023, China%State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China
• Subjects: Adsorption; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coal gas outbursts; Coal mining; Composites; Corrosion and Coatings; Fatalities; Geological structures; Geology; Geomechanics; Glass; Invited Review; Laboratories; Materials Science; Mathematical models; Mechanical properties; Metallic Materials; Microscopy; Natural Materials; Numerical models; Statistical analysis; Stratigraphy; Surfaces and Interfaces; Thin Films; Tribology; Underground mining; outburst model; outburst mechanism; microscopic pore structure; coal and gas outburst; outburst simulation
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-019-1956-9

Coal and gas outburst is a frequent dynamic disaster during underground coal mining activities. After about 150 years of exploration, the mechanisms of outbursts remain unclear to date. Studies on outburst mechanisms worldwide focused on the physicochemical and mechanical properties of outburst-prone coal, laboratory-scale outburst experiments and numerical modeling, mine-site investigations, and doctrines of outburst mechanisms. Outburst mechanisms are divided into two categories: single-factor and multi-factor mechanisms. The multi-factor mechanism is widely accepted, but all statistical phenomena during a single outburst cannot be explained using present knowledge. Additional topics about outburst mechanisms are proposed by summarizing the phenomena that need precise explanation. The most appealing research is the microscopic process of the interaction between coal and gas. Modern physical-chemical methods can help characterize the natural properties of outburst-prone coal. Outburst experiments can compensate for the deficiency of first-hand observation at the scene. Restoring the original outburst scene by constructing a geomechanical model or numerical model and reproducing the entire outburst process based on mining environment conditions, including stratigraphic distribution, gas occurrence, and geological structure, are important. Future studies can explore outburst mechanisms at the microscale.