关键词: 矿井末采期, 工作面, 高位钻孔, 钻孔优化

Abstract: Abstract: In order to reduce the low gas coal mine gas “U” type ventilation in upper corner gas concentration, improve the extraction efficiency of the coal mining face in Fenghuang-shan mine 15# coal seam XV1306, high drilling working face as the research object, theoretical calculation of influence of key technological parameters of drilling drainage, respectively from the effective length and high drilling the utilization rate of drilling parameters, the two aspects of reasonable spacing and the number of boreholes are calculated and simulated numerically using COMSOL software extraction time and extraction effect of negative pressure recovery effect of high drilling of high drilling parameters were optimized. The practice shows that XV1306 high gas coalface high drilling and drilling field after optimization, production efficiency and improved pumping type “U” gas ventilation of coal face, the upper corner gas concentration decreased, the effect of gas field significantly, thus ensuring the safe and efficient mining.