Research and Application of High Extraction Roadway Engineering in Working Face
The mining area of a certain mine exhibits the characteristics of thick coal seam,high gas concentration,and large gas emission during the mining period.Especially during the first mining face mining process,the gas concentration in the upper corner of the return airway repeatedly exceeds the limit,while the gas concentration in the high-level gas drainage roadway is less than 4％,resulting in poor extraction effect.Therefore,the layout of high drainage roadway layers near the fully mechanized mining face is carried out,combined with the principle and theoretical formula of high drainage roadway gas drainage,the design of high drainage roadway layers and pipelines is carried out to enhance gas drainage volume and reduce gas concentration in the upper corner.
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