厚煤层高位钻孔位置确定及效果检验

Location identification and validity check of high position bores in thick coal seam

为达到治理上隅角瓦斯超限的目的,基于上覆岩层三带分布理论和"O"形圈理论,初步确定高位钻孔的分布范围,并根据晋煤集团成庄矿现场试验结果加以检验,确定了厚煤层瓦斯抽放高位钻孔参数.试验结果表明,理论计算和现场试验结果存在显著差异,高位钻孔对上隅角瓦斯浓度的影响在很大程度上受制于"O"形圈的分布范围.现场布置高位钻孔时应在理论确定方法的基础上,根据实际矿区的具体情况对钻孔参数加以修正.

To deal with gas transfinite problem of the upper corner, distribution range of high position bores is preliminarily determined based on the three zones distribution theory of overlying rock and ＂O＂ Ring theory. The validity of high position bores is checked according to field test results at Chengzhuang mine affiliated in Jincheng anthracite mining group. Parameters of gas drainage high position bores are identified in thick coal seam. Test results show that there are significant differences between theoretical calculation and field test results. The influence of high position bores on the upper comer gas concentration is subject to ＂O＂ ring distribution range to a great extent. Drilling parameters should be fixed on the basis of theoretical determination and specific circumstances of the actual mining area.