晋城矿区下保护层开采覆岩运移及裂隙演化规律研究  

Overburden strata movement and fissure evolution in lower protective layer in Jincheng mining district

作　　者：焦振华[1] 陶广美[2] 王浩[1] 卢志国[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]山西晋城无烟煤矿业集团有限责任公司,山西晋城048000

出　　处：《采矿与安全工程学报》2017年第1期85-90,共6页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2010CB226801;2010CB226804);国家自然科学基金项目(51174213)

摘　　要：针对晋城矿区开展下保护层开采试验,采用模拟试验,现场实测等手段研究下保护层开采覆岩运移、裂隙动态演化特征及被保护层变形规律。模拟结果表明:伴随基本顶的周期破断,采动裂隙呈梯形演化,贯通的竖向裂隙没有连通至上被保护层。保护层开采后,被保护层下沉平缓连续,膨胀变形率保持在0.5%左右。深基点位移计动态监测下保护层94302工作面开采覆岩运动全过程,得到了监测岩层的移动曲线,掌握了上覆岩层横向三区、纵向三带离层裂隙时空演化规律。通过钻孔电视观测覆岩裂隙分布特征及被保护层煤体结构变化,得到冒落带高度2.2~4.5 m,裂隙带高度20.0~25.7 m,发现被保护层煤体受采动影响产生水平方向为主的小角度次生裂隙。With the lower protective seam mining test in Jincheng mining district as engineering back- ground, the overburden strata movement, fissure evolution characteristics, and the deformation law of the protected layer in the lower protective layer were studied through simulation test and field test. The simulation results have shown that with periodic breaking of the main roof, mining fissure evolves with the shape of trapezium, and the vertical cracks are not connected to the protected layer; after protective seam mining, the protected seam sinks smoothly and continuously, and the expansion of the deformation rate remains around 0.5%; deep displacement meter was used to monitor the movement laws of over- burden strata in the whole mining process of working face 94302, the moving measured curve of the strata monitored was obtained, and the spatial and temporal evolution law of the three horizontal zone and vertical belt distribution scope in mining overlying strata of the protective seam were grasped. Through the analysis of the fissure distribution characteristics and structural damage observed on the protected seam with borehole television, the caving zone height was measured to be about 2.2~4.5 m, and the fracture zone height about 20~25.7 m; micro horizontal cracks mainly with small angle appeared in the protective layer under the influence of mining.

关 键 词：下保护层 岩层移动 覆岩“两带” 裂隙演化 深基点位移计 

分 类 号：TD32[矿业工程—矿井建设]