摘要
为实现煤与瓦斯突出煤层的安全高效开采,运用现场实测、力学分析与数值模拟的方法,研究了保护层与被保护层间有完整厚"屏障"岩层时,该完整厚岩层对瓦斯释放作用的影响。分析了上保护层开采过程中,完整厚"屏障"岩层的应力变化规律和破坏规律。研究结果表明:保护层开采后,该岩层中应力减小到原岩应力的43%,岩层通透性增大;底板塑性区穿过完整厚"屏障"岩层,深度超过20m,岩层出现的新裂隙与旧裂隙贯通形成"瓦斯通道",一般破坏发生在煤壁后方5m左右的底板中;说明了保护层作用不受该完整厚岩层控制,被保护层在开采过程中,采空区残留的解析瓦斯可能造成工作面上隅角瓦斯积聚,生产过程中要加强瓦斯监控。
To achieve the safe and efficient mining in coal and gas outburst seam,field measurement and numerical simulation was applied,to study the liberating effect gas with intact thick stratum between the protective and protected seams.The law of stress variation and stratum failure were analyzed.The results show that,after mining of protective seam,stratum stress is released to 43% of in- situ rock stress,the permeability is increased; and the floor plastic zone crosses the barrier stratum,to the depth over 20 m,with formation of new fractures cutting through the old ones,which forms gas passages; failure occurs at 5m behind coal wall.The effect of protective seam is not affected by the barrier stratum,but in mining process,goaf residue gas may accumulate in the top corner of working face,calling for strong gas monitoring.
出处
《煤炭工程》
北大核心
2015年第1期81-84,共4页
Coal Engineering
基金
陕西省自然科学基金资助项目(2011jy005)
陕西省岩层控制重点实验室项目(13JS066)
