摘要
为解决顶煤破坏区下破碎围岩巷道变形大、破坏严重的难题,以韩咀矿32103工作面辅运巷为研究对象,采用现场实测及理论分析相结合的方法对巷道围岩应力分布及变形机理进行研究。结果表明:32103辅运巷道顶板存在的顶煤破坏区呈非连续分布,32103辅运巷道围岩应力环境调整及顶煤遗留煤柱与区段煤柱有效承载宽度减小是导致巷道矿压显现明显的主要原因。基于上述探测及理论分析结果,提出以“深浅孔注浆+锚网索”联合支护为主的巷道围岩控制技术及以“架棚+底板卸压”为主的加固技术。现场应用结果表明:采用新支护方案后,32103辅运巷道围岩最大顶底板移近量为70mm,最大两帮收敛量为48mm,支护锚杆未出现破断现象,且锚杆受力与围岩变形均在合理区间,巷道支护效果良好。
In order to control the large deformation and serious damage of broken surrounding rock roadway under the top coal failure area, taking the auxiliary transportation roadway of 32103 working face of Hanzui Mine as the research object, the stress distribution and deformation mechanism of roadway surrounding rock are studied with field measurement and theoretical analysis. The results show that the top coal failure area in the roof of 32103 auxiliary transportation roadway is discontinuous. The adjustment of surrounding rock stress environment of 32103 auxiliary transportation roadway and the reduction of effective bearing width of top coal pillar and section pillar are the main reasons for the obvious mine pressure behavior in the roadway. Based on the above detection and theoretical analysis results, the roadway surrounding rock control technology based on “deep and shallow hole grouting+anchor mesh cable” combined support and the reinforcement technology based on “shed+floor pressure relief” are proposed. The field application results show that, with the new support scheme, the maximum roof and floor displacement of surrounding rock in 32103 auxiliary transportation roadway is 70 mm, the maximum convergence of two sides is 48 mm, the supporting bolt is not broken, and the bolt stress and surrounding rock deformation are in a reasonable range, the roadway support effect is favorable.
作者
乔志
孙华清
王聪
刘建华
王旭锋
QIAO Zhi;SUN Hua-qing;WANG Cong;LIU Jian-hua;WANG Xu-feng(China Coal Huajin Group Hanju Coal Industry Co.,Ltd.,Linfen 042100,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤炭工程》
北大核心
2022年第6期95-100,共6页
Coal Engineering
关键词
顶煤破碎
采动影响
变形机理
应力环境
控制技术
broken top coal
mining influence
deformation mechanism
stress environment
control technology
