Expansionary Evolution Characteristics of Plastic Zone in Rock and Coal Mass Ahead of Excavation Face and the Mechanism of Coal and Gas Outburst

Hongtao Liu, Linfeng Guo and Xidong Zhao
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Hongtao Liu: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Linfeng Guo: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Xidong Zhao: School of Safety Engineering, North China Institute of Science & Technology, Beijing 101601, China

Energies, 2020, vol. 13, issue 4, 1-13

Abstract: Factors leading to coal and gas outbursts are complicated, and the accuracy of predicting outbursts remains difficult to achieve. Therefore, coal and gas outburst risk are still a scientific challenge in the fields of mining, geology, safe engineering, and rock mechanics. Theories explaining and predicting coal and gas outbursts associated with restored strain and gas energy are hot topics. Based on numerical modelling, the evolution of a plastic zone ahead of an excavation face with change of direction and magnitude of regional pre-mining stress field were analyzed. A mechanical analysis model for the expansionary evolution process of the plastic zone ahead of the excavation face was constructed, and the expansionary evolution characteristics of plastic zone ahead of the excavation face were analyzed. The physical and mechanical process and basic conditions for the initiation and development of coal and gas outbursts induced by evolution of plastic zone were discussed. The research provides some new insights into the mechanism, prediction, and prevention of goal and gas outbursts.

Keywords: excavation; gas energy; plastic zone; numerical modelling; expansionary evolution; coal and gas outburst (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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