Effect of damage evolution of coal on permeability variation and analysis of gas outburst hazard with coal mining

Yi Xue (), Feng Gao () and Xingguang Liu

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2015, vol. 79, issue 2, 999-1013

Abstract: Coal and gas outburst disasters in coal seams are becoming more serious as coal mines extend deeper underground in China. Damage evolution has affected gas flow in coal seam greatly, which also controls gas permeation and gas extraction results, and finally, it has tremendous influence on prevention and control of gas disaster accidents. In this paper, the cracking process of coal under compressive stress condition and the permeability variation during the whole process is experimentally studied with the aid of 3D acoustic emission monitoring system. The experimental results suggest that the coal failure and degradation of mechanical properties are essentially related to the propagation and coalescence of induced cracks. Using a damage tensor defined by the direction-dependent crack density, the damage evolution during the whole loading process is studied. It is revealed that the damage evolution is mainly initiated with the appearance of microcracks and accelerated in the post-peak region. During the post-peak region, a similar increase tendency of damage and permeability is noticed, and therefore, a post-peak permeability model is proposed considering the influence of damage evolution on the permeability variation in the post-peak region. Finally, we analyze the gas outburst hazard with coal mining. There exists a transition zone around the vertical stress concentration, and energetic failure may result in this transition zone. Copyright Springer Science+Business Media Dordrecht 2015

Keywords: Gas outburst hazard; Permeability variation; Damage; Permeability enhanced coefficient (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (5)

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DOI: 10.1007/s11069-015-1888-2

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