Big Diameter and Long Drilling-Holes Technology and its Application in Drainage Gas in Dingji Coal Mine
Taking advantage of the method of big diameter and long drilling-holes in coal seam’ roof instead of roadway method to drainage gas from coal seam, aimed at the condition of deep coal seam and high risk of outburst in Dingji Coal Mine. The amount and rate of drainage gas was increased, and decreased the time and engineering amount of drainage gas, and effectively diminished the risk of outburst of coal and gas. And a new approach adapt to Dingji Coal Mine to drainage gas is acquired.
Hao Zhang, Yang Fu and Zhong Tang
C. Feng "Big Diameter and Long Drilling-Holes Technology and its Application in Drainage Gas in Dingji Coal Mine", Advanced Materials Research, Vols. 354-355, pp. 104-108, 2012