摘要
坚硬顶板具有硬度大、整体性好、难垮落等特点,但同时也导致综放工作面末采期间诸多围岩控制与安全问题.本文以潞安集团漳村煤矿2505综放工作面为工程背景,利用工作面末采切顶护巷水压致裂控制技术,人为控制顶板垮落,改变保护煤柱覆岩结构,得到了最优保护煤柱宽度为70 m,最佳切水力切顶顶板合理破断位置为停采线前方5 m处.现场监测结果表明,切顶后20 d内采区准备巷道顶底板最大下沉量为446 mm,两帮最大移近量为350 mm,支架载荷平均降低了38.8%,达到了保护采区准备巷道、缩小保护煤柱、安全高效回采的目的,为同类型矿井提供借鉴和指导.
Hard roof has the characteristics of high hardness,good integrity and difficulty to collapse,which leads to many surrounding rock control and safety problems during the final mining period of fully mechanized caving face.Based on the engineering background of 2505 fully mechanized top coal caving face in Zhangcun Coal Mine of Lu'an Group,this paper uses the hydraulic fracturing control technology to control the roof collapse artificially and change the overburden structure of protective pillars.The optimum width of protective pillars is 70 m,and the optimum location of reasonable breakage of hydraulic roof cutting is 5 m ahead of the stopping line.The field monitoring results show that the maximum subsidence of roof and floor is 446 mm,the maximum approach of two sides is 350 mm,and the support load is reduced by 38.8% on average within 20 days after roof cutting.The purpose of protecting roadways,reducing protective pillars and safe and efficient mining is achieved,which provides references and guidances for similar mines.
作者
杨计先
Yang Jixian(Zhangcun Coal Mine of Lu'an Group,Changzhi 046100,China)
出处
《矿业工程研究》
2019年第1期30-39,共10页
Mineral Engineering Research
关键词
坚硬顶板
水压致裂
综放工作面末采
切顶护巷
保护煤柱
hard roof
hydraulic fracturing
end mining of fully mechanized caving face
roof cutting and roadway protection
coal pillar protection
