Gas accident is crucial problem that influence safety in production in our country. Many producitve practive indicate that underground pressure changing of working face and gas emission are very correlative. 12071 working face in Pingdingshan Coal Co.Ltd.No.13 is a low gaseous mine, but the gas of working face over secure density during periodic weighting, so it is very important toward gas prevention and cure to study relationship between underground pressure changing of working face and gas emission.
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