数值模拟在许疃煤矿3235工作面高位钻孔抽放研究中的应用

Based on the importance of judging comprehensively coal nomal distribution range of the "vertical three zone" in overlying strata above coal seam and improving gas drainage effect of highly-located borehole effectively, with RFPA2D numerical simulation software to simulate gob roof caving in the 3235 working face of Xutuan Coal Mine and combined with calculation results by empirical formula coal normal distribution range of the "vertical three zone" was analyzed preliminarily, it offer the reference for the highly-located borehole design.