Methane problem is getting more seriously with the depth of mine pits is increasing in our country. There are many low methane mines are gradually becoming high ones even coal and gas burst ones. On the basis of 21010 synthetic mechanical mining face in Pingdingshan 2nd Coal mine.It analyzed the relationship between period weighing in the process of the synthetic mechanical mining and out-flow of methane.through field measurements and numerical modeling. Meanwhile,based on the theoretical analysis,it can de...
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