In order to further improve the directional long drilling extraction effect of high-level cracks on the roof,based on the comprehensive column chart of the 3502 working face and the distribution law of the"three zones"on the roof,a study was conducted on the pressure relief gas extraction tech-nology of"using holes instead of tunnels"in the goaf of the working face.The relationship between the concentration,purity,and extraction mixture of directional long drilling extraction of high-level cracks on the roof of the No.2 directional drilling site of the 3502 working face and the distance of the working face was investigated and analyzed.The optimal extraction effect layer was determined,and the reasonable arrangement of drilling holes was summarized,which saved a lot of construction time and cost,achieved the goal of zero gas exceedance in the goaf and upper corner of the working face,and ensured the efficient extraction of the working face in low gas state.
关键词
瓦斯治理/以孔代巷/高位定向钻孔/层位/裂隙带
Key words
gas control/hole in place of lane/high-level directional drilling/layers/fractured zone
万方数据