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一、引言 近十年来,由于煤和瓦斯突出及大量的瓦斯涌入工作面,越来越多的矿井在生产和安全上受到影响。通过煤层钻孔预排煤层瓦斯已被证明是减少瓦斯涌出和降低突出事故的有效方法。在煤层内打长排放钻孔(孔长200米以上)预排瓦斯可降低瓦斯排放成本。澳大利亚煤层为近水平厚煤层,根据美国和南非的经验,在澳大利亚进行长钻孔瓦斯排放是可行的。
I. INTRODUCTION In the past decade, more and more mines have been affected in production and safety due to the outburst of coal and gas and the influx of large amounts of gas into the work surface. Predrying coal seam gas through coal seam boreholes has been proved to be an effective way to reduce gas emission and reduce accidents. Long-run drilling in the coal seam (hole length 200 meters) pre-drainage gas can reduce gas emission costs. The coal seam in Australia is a nearly horizontal thick seam. Based on the experiences of the United States and South Africa, it is feasible to carry out long-hole gas drainage in Australia.