Gas Emission Rule and Its Control during Hard Roof Periodic Weighting inFull-mechanized Caving Mining

Based on the underground pressure observation and gas monitoring data inⅠ010202 fully-mechanized caving face in Kuangou Mine, analysis was made on the stope gas emission rule according to the change of underground pressure. Study results showed that the gas emission in the working face increased with the increase of the working resistance of the face support, the gas emission during periodic weighting was clearly greater than that at any other time, the period of gas emission was almost synchronous with the periodic weighting of the roof, and the time of gas emission was slightly behind the periodic weighting time of the roof. The gas control measures were applied, including the gas dranaige by the long or short interval high-level boreholes drilled at the corner angle and in the middle lane of the face, good effect was obtained.