Study on Gas Drainage Technology in Goaf of Steep Seam

Aiming at the problem of gas control in upper corner steeply inclined coal seam, taking 3103 working face a mine as an example, this paper determines height range fracture zone by combining theoretical empirical formula with on-site investigation microseismic monitoring technology, designs parameters drainage borehole during production, and analyzes effect long-strike through experiments. The results show that average extraction concentration long along strike is 53.55%, purity 5.37 m 3 /min. After treatment, about 0.4%, return air roadway 0.3%, which ensures quantity.