Gas Control Technology for High Gas Fully Mechanized Working Face in Low Gas Mine

The 22620 fully mechanized working face of Zhenchengdi Coal Mine was taken as the research object, combined with the mining technology and geological conditions of 22620 fully mechanized face , the reason of high gas in this fully mechanized face was studied, and the mechanism of gas extraction in the fractured zone was discussed.The gas control technologies were proposed,including the drilling drainage in the fractured zone of roadway side wall, the drilling drainage in the roof fractured zone near the working face and the gas drainage in this coal seam. Especially, the drilling drainage in the fractured zone of roadway side wall, played an effect of buried tube pumping drainage on the upper corner, which could prolong the drainage time and reduce the cost. The drilling drainage in the roof fractured zone near the working face provided the conditions of normal and ordered advancing for this fully mechanized face. After the implementation of gas control technology, the monitoring equipment showed that the gas concentration was not less than 0.34% in the return airway of 22620 fully mechanized working face,which provided the guarantee for safe and efficient mining at the fully mechanized face.