摘要
针对大社矿回采工作面结束后应力分布发生变化、卸压区域内煤层存在突出风险的问题,通过取样测定煤层瓦斯含量W、钻屑解吸指标Δh_(2),分析瓦斯含量、压力特征,结合保护煤柱和掘进工作面宽度,研究采空区边缘在煤体瓦斯压力平衡状态遭到破坏后形成的卸压范围。应用结果表明,92623工作面开采后对相邻区段的卸压保护,有效范围为距采空区边缘实体煤测法线距离15 m,在保留宽度较小的安全煤柱和合理的支护前提下,保证了沿采空区掘进的安全性和可靠性。
Aiming at the problem that the stress distribution changes after the end of the mining face in Dashe Mine and the risk of coal seam outburst in the pressure relief area,the gas content W of the coal seam and the desorption index Δh_(2) of the drilling cuttings were measured by sampling,and the gas content and pressure characteristics were analyzed.Combined with the width of the protective coal pillar and the heading face,the pressure relief range formed by the edge of the goaf after the destruction of the gas pressure balance of the coal body was studied.The application results showed that the effective range of the pressure relief protection of the adjacent section after the mining of No.92623 Face was 15 m from the normal line of the solid coal measurement at the edge of the goaf.Under the premise of retaining the safety coal pillar with smaller width and reasonable support,the safety and reliability of the driving along the goaf were ensured.
作者
马杰
Ma Jie(Dashe Mine Jizhong Energy Fengfeng Group Co.,Ltd.,Handan 056201,China)
出处
《煤炭与化工》
CAS
2023年第10期119-122,共4页
Coal and Chemical Industry
关键词
采空区卸压
沿空掘巷
瓦斯含量
钻屑解析指标
卸压范围
goaf pressure relief
gob-side entry driving
gas content
analysis index of drilling cuttings
pressure relief range
