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Abstract Based on the ventilation system layout of Tangshan Mine, the relationship between Y486外 fully mechanized working face ventilation pressure and gas emission change was analyzed, gas let out control technology using upper goaf nearby and tail roadway gasproof, adjusting ventilation pressure made Y486 working face gas move airtightly to T1455 goaf and Y486 tail roadway, which reduced gas content of Y486 working face, improved the gas drainage content of Y486 tail roadway and ensured the safe mining of Y486 working face.
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