针对金岭煤矿采取的瓦斯治理措施———开采保护层,基于该矿井的地勘瓦斯资料,探讨了开采保护层的合理性,介绍了下保护层开采和底板穿层抽放的方法,评价了开采保护层的效果。结果表明:在高瓦斯矿井中实施保护层开采措施后,煤体得到卸压且产生大量裂隙,瓦斯含量最大值和压力最大值均降低到临界值8.00 m3/t和0.74 MPa以下,改变了煤层瓦斯赋存规律,增加了煤层透气性,提高了抽放效果,从而大幅降低了煤与瓦斯突出危险性。

According to the gas control measures made for the protective seam mining in Jinling Mine, based on the mine geological gas exploration information, th e paper discussed the rationality of the protective seam mining.The paper introduced the mining method for the below protective seam and the gas drainage method wit h boreholes through the floor strata and evaluated the effect of the protective seam mining. The results showed that after the mining measures made in the protective se am of the high gassy mine, the seam pressure would be released and great cracking would be occurred in the seam.The max gas content value and the max gas press ure would be all reduced below the critical values individually as 8.00 m3/t and 0.74 MPa.Thus the seam gas deposit law would be changed, the seam permeability woul d be improved, the gas drainage effect would be improved and the coal and gas outburst danger would be highly reduced.