Based on a great many statistical data, the present paper has analyzed the complicated relations between the coal and gas outburst scales and various factors, such as mining depth, tunnel types, geological structures, outburst signs, coal seam thickness and the ways of exploitation, thus finding the general regularities of the outburst scales. As is known, once the hierarchy analysis model of coal and gas outburst scales is established and the weight of each factor contribution grade for the outburst scales...
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