关键词: 瓦斯抽采, 坚硬顶板, 采空区, 定向钻孔, 高抽巷

Abstract: Aiming at the problem of gas control in goaf of outburst coal seam, taking the 12110 working face of Shoushan No. 1 Mine as the test background. The caving characteristics of the roof of hard overlying coal seam are studied by using the coupling theory of crack field and gas field. The study found that the caving steps of the Dazhan sandstone and the fragrant charcoal sandstone in the roof of the working face are quite different, and the gas enrichment area in the goaf is formed under the caving step. By means of the comparison method, a near-field gas extraction technology in the goaf based on the roof strike long borehole is proposed. The test results show that the gas flow rate of the long drilling hole in the roof direction is 8.3m3/min. Under the coordinated extraction with the high-drainage roadway and the upper corner buried pipe, the gas high value of the upper corner is controlled below 0.6%, which ensures the work. High-quality recovery.