多煤层近距离保护层开采瓦斯涌出规律及抽采方案研究

 为确保近距离保护层工作面的生产安全，采用分源预测方法对罗州煤矿首采工作面瓦斯涌出规律进行分析，研究表明本煤层瓦斯涌出占16.9%，上邻近层瓦斯涌出占50.7%，下邻近层瓦斯涌出占32.4%。在此基础上对罗州煤矿瓦斯抽采方案进行优化设计，首采工作面采用本煤层顺层平行斜交钻孔、采空区埋管抽采结合通风稀释瓦斯，上邻近层采用高抽巷抽采环形裂隙圈内高浓度瓦斯，下邻近层采用底板穿层钻孔抽采底臌断裂带和底臌变形带内的卸压解吸瓦斯。通过保护层卸压开采配合卸压瓦斯强化抽采方法，降低了卸压煤层瓦斯含量，消除了被保护层煤与瓦斯突出危险性。

Research of Gas Emission Rule and Extraction Scheme for Close Protective Coal Seam in Multiple Seam of Guizhou

In order to ensure mining safety of short distance protective seam face, using gas points source prediction method to analyze the gas emission law of first mining face of Luozhou Coal Mine, the research shows that the coal seam gas emission accounted for 16.9%, on the adjacent layer gas emission accounted for 50.7%, next adjacent layer gas emission accounted for 32.4%. On this basis, we optimize Luozhou Coal Mine gas extraction plan, the first mining face using the coal bedding parallel oblique drilling, goaf buried pipe drainage combined with ventilation dilution gas, on the adjacent layer using high pumping lane extraction ring crack circle high density gas, the next adjacent layer using penetrating boreholes extraction relief desorption gas in the floor heave fracture zone and deformation zone. Through the cover pressure relief mining with pressure relief gas strengthening extraction method, it reduces the pressure relief coal seam gas content, eliminates the protective layer coal and gas outburst danger.