孤岛工作面矿压规律及回采巷围岩控制研究

Mine Pressure Law and Surrounding Rock Control of Stoping Roadway in Isolated Working Face

孤岛工作面受相邻采空区及本工作面采动影响,工作面上覆岩层活动远比普通工作面剧烈,应力很高,围岩遭到严重破坏,给工作面安全高效开采带来严重挑战。如何延长孤岛工作面回采巷道的使用寿命是煤矿生产企业所面临的亟须解决的技术难题。针对燕家河煤矿8213孤岛工作面地层赋存特征和开采技术条件,采用理论分析、数值模拟的研究方法,通过弹性薄板理论,得到燕家河煤矿8213孤岛面基本顶初次来压步距、周期来压步距分别为10、35 m。采用数值模拟进一步对8213孤岛工作面覆岩运动规律及工作面围岩应力分布进行分析,明确上覆岩层结构失稳导致事故的机理,提出科学的工作面顶板管理措施。

The isolated working face is affected by the mining movement of the adjacent goaf and the working face,and the overlying strata activity on the working face is much more intense than that of the ordinary working face,the stress is high,and the surrounding rock is seriously damaged,which brings serious challenges to the safe and efficient mining of the working face.How to prolong the service life of the roadway of isolated working face is an urgent technical problem faced by coal mine production enterprises.According to the formation occurrence characteristics and mining technical conditions of 8213 isolated working face in Yanjiahe Coal Mine,the first pressing step and periodic pressing step of 8213 isolated working face in Yanjiahe Coal Mine were obtained to be 10 m and 35 m respectively by using the theory of elastic thin plate and theoretical analysis and numerical simulation.The motion rule of overlying rock and the stress distribution of surrounding rock on the working face of 8213 isolated working face were further analyzed by numerical simulation,the mechanism of the accident caused by the instability of overlying rock structure was clarified,and the scientific roof management measures of working face were put forward.