Abstract
Sudden emission of gas from coal seams underlying a working coal seam can inundate the mine and cause a disaster. Methods to solve this problem include premining degasification of these coal seams and especially designed gob wells that are completed well below all underlying coal seams. Minor gas emissions on longwall faces can be handled by drilling short holes on face and grouting the floor. Gas outburst is a major problem in many deep coal mines overseas, such as Australia, China, Poland, and Ukraine, but it is not as serious a problem in deep mines of Colorado, Kentucky, and Utah in the United States. Parameters that measure the propensity of a coal seam for gas outburst are listed as great depth, gas content, reservoir pressure, and a low sorption time of less than 1day. Preventive measures in current use are inefficient. A massive degasification of all moderately and highly gassy coal seams prior to mining is advocated, which can lower the gas content to 100ft3/t and reservoir pressure to less than 100psi. It is expensive but highly desirable for safety and high productivity.
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