保护层开采卸压瓦斯抽采技术研究

为防止被保护层中瓦斯大量涌向保护层工作面,造成其工作面上隅角和回风巷瓦斯超限,基于采空区上覆岩层"三带"中瓦斯运移规律,利用高位钻孔抽放被保护层卸压瓦斯。通过在羊东矿8458工作面应用实践,采用理论计算与数值模拟确定裂隙发育带的高度,并对高位钻孔参数进行优化设计,结果表明:该工作面单孔纯瓦斯抽采量由0.5m3/min提高到0.8m3/min,回风巷瓦斯浓度由0.9%降低到0.4%,上隅角瓦斯浓度由1.2%降低到0.6%,提高了瓦斯抽放率,保证了工作面安全回采。

Pressure Relief Gas Extraction Technology Research in Protective Layer Mining

To prevent protected gas flooding to protective working face, cause its top corner and return air roadway gas overrun , based on gas migration rule in “three zones” of goaf overling strata, took use of high drilling to draiage prssure relief gas from proteccted seam; Through practical application in Yangdong mine 8458 working face, adop theoretical calculation and numerical simulation to determine the height of the fracture zone and desingn high drilling parameter; Results show that every drilling of the working face pure gas drainaging quantity increased from 0.5 m3 / min to 0.8 m3 / min, gas concentration of return air roadway reduced from 0.9% to 0.4% and gas concentration of the upper corner reduced from 1.2% to 0.6%, improved gas drainnage rate, ensured the safety and efficiency of recovery.