综放面顶板覆岩走向长钻孔卸压抽放瓦斯研究

Pressure releasing and gas drainage with long bore hole in roof overburden of fully mechanized caving face

通过理论分析和现场实际考察分析了煤炭开采顶板覆岩垮落变形动态变化规律 ,分析了覆岩关键层的层位及岩体特性对煤层回采后顶板岩层的垮落区、裂隙区的扩展影响特征 ;结合现场工程实际 ,提出了针对低渗透性煤层提高煤层瓦斯抽放率的一种新的顶板覆岩卸压抽放技术 ,分析影响瓦斯抽放量的因素 ,给出了顶板卸压钻孔的合理布置区域。

With theory and site practical study, the paper analyzed the dynamic change deformation law of roof overburden falling in coal mining face. The paper analyzed the position and rock characteristics of overburden key layer affected to the falling zone and cracking zone after coal mining operation. With the site practical operation, the paper provided a new pressure releasing and gas drainage technology base on a low permeability seam in order to improve a gas drainage rate. Base on factors affected to the gas drainage quantity, the paper provided rational arrangement zone for roof pressure releasing bore holes.