论文部分内容阅读
为了有效地提高高位钻孔瓦斯抽采效果,利用相似材料模拟试验,分析了祁南煤矿714工作面顶板冒落规律,结合经验公式,综合判定了煤层上覆岩层“竖三带”的分布范围,确定了裂隙带为距71煤层顶板上方18.4～49.0m的岩层区域,最终高位钻孔法距参数取值范围选择为18.0～34.0m。
In order to effectively improve the effect of gas drainage in high level drilling, the law of roof caving in No.714 working face of Qinan Coal Mine was analyzed by simulating experiment of similar materials, and combined with the empirical formula, the coal seam overlying strata “vertical three belts” The range of fracture zone is determined to be 18.4 ~ 49.0m above the roof of 71 coal seam, and the final range of drilling parameters is 18.0 ~ 34.0m.