低透气性厚煤层综放开采瓦斯抽采关键技术

Modern Mining(2016)

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Abstract
针对彬长矿区下沟煤矿侏罗纪4#煤层厚度大、透气性差,本煤层预抽效果不佳,综放开采瓦斯涌出量大等难题,综合采取"本煤层扇形钻孔+平行钻孔"采前预抽和边采边抽,专用瓦斯抽放巷抽采采空区瓦斯等技术,上隅角瓦斯浓度稳定在0.35%左右,回风顺槽瓦斯浓度稳定在0.3%左右,风排瓦斯量为3.5 m3/min,工作面瓦斯抽采取得了明显效果,保证了工作面安全回采.
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