ABSTRACT: This paper describes a comprehensive laboratory study conducted to evaluate the primary relationships between the physical properties of coal and its proneness to outbursts as well as gas flow efficiency. Samples of coal taken from outburst prone coal seams in China were tested to characterize three different properties: pore distribution, fragmental fractal dimension, and electromagnetic response. The results indicated that outburst prone coal has stronger electromagnetic response and a higher value of fragmental fractal dimension. Furthermore, the results suggested that both electromagnetic response and fragmental fractal characteristics of outburst pone coal can be explained in terms of the pore structure of outburst prone coal, which appears to be the primary property, with the other two being derived from it. Finally, the results were used to develop simple guidelines for efficient methane drainage from coal seams with potential for coal and gas outbursts.

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