低透气性突出煤层群首采层掏心无煤柱开采卸压消突与瓦斯治理试验研究

Experimental research on low permeability coal seams group of first layer hollow out coal mining without pillars for release of eliminate the highlight and gas control

针对深井高瓦斯低透气性突出煤层群消突和首采层开采卸压瓦斯治理难题,以谢桥煤矿11426工作面开采为例,设计首采中间层无煤柱开采、实现上下突出煤层均消突的技术方案,研究了Y型通风工作面采空区瓦斯及风压分布规律,结合煤层群开采巷道布置条件,提出并实施留巷侧井下暗立眼回风阶段留巷Y型通风技术,强化留巷墙体封闭和留巷采空侧回风立眼封闭等卸压瓦斯抽采技术,实现了深井煤层群首采层工作面的安全高效回采和邻近突出煤层的全面消突。11426工作面回采期间,绝对瓦斯涌出量最大47.67 m3/min,工作面瓦斯抽采率高达65%以上,研究成果为今后类似深井煤层群开采的卸压瓦斯抽采和治理提供技术指导。

As for the problem of deep gas low permeability outburst coal seam group of release of eliminate the highlight and pressure relief and the gas control of first layer mining,based on Xeqiao mine 11426 working face mining as an example,the design of first layer without coal pillar mining,realize technical proposal on up and down coal seams of eliminate the highlight,research laws of goaf gas and wind pressure distribution on Y type ventilation working face,combinate condition on multi-seam mining of roadway layout,innovation present and implementation technology of the side for downhole dark set eyes return air phase for Y type ventilation,strengthen technology of the walls closed and the goaf side return for eye closed on pressure relief gas extraction,realized the working face of deep coal seam group of first floor safe and efficient mining and adjacent coal seams outburst elimination。During the 11426 mining face,the absolute gas emission maximum 47. 67 m3/ min,the working face gas extraction rate as high as 65% above,provide technical guidance on research of pressure relief gas extraction and government from similar deep well multi-seam mining for the future。