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基于华丰煤矿4#煤层开采的覆岩离层注浆钻孔布置,采用理论分析、区域动力规划与室内相似模拟试验3种方法,分析现有技术受工作面长度短、留设煤柱与巨厚砾岩断裂步距判定有误等因素造成减沉效率低的问题,提出采用覆岩离层连续一体化注浆技术布置倾向注浆钻孔,区域动力规划划分断裂的基础上布置走向注浆钻孔。通过相似模拟试验发现,采用覆岩离层连续一体化注浆技术可改善覆岩采动不充分、煤柱失效造成采空区活化以及砾岩下方受工作面倾斜长度影响难以出现离层等现状。最后,提出在华丰矿巨厚砾岩下方沿倾斜方向布置连续一体化注浆钻孔,在工作面上巷外侧80 m沿走向布置6个注浆钻孔于断裂位置处,并对其进行分析认为,离层区下方岩层的采动程度充分,注浆减沉效率可达到44.6%,多回收煤炭资源9.4×107 kg及沿倾斜方向减少钻孔工程量930 m。
Based on theoretical analysis, regional dynamic planning and indoor simulation test, based on the layout of off-bed grouting drilling holes in 4 # seam in Huafeng Coal Mine, the existing technology is analyzed by three methods: short working face, It is proposed that adopting the continuous grouting technology of overburden strata to arrange the grouting borehole and the regional dynamic planning to divide the fractures, Drilling holes. Through similar simulation tests, it is found that the continuous overburden grouting technology can improve the overburden mining. The failure of coal pillar causes the goaf to be activated and the slope below the conglomerate to be affected by the slope length. . Finally, it is proposed that a continuous integrated grouting drilling be arranged along the inclined direction under the huge thick conglomerate of Huifeng Mine. Six grouting holes shall be arranged at the fracture site along the strike direction 80 meters away from the side of the tunnel, According to the analysis, the mining degree of rock strata beneath the sub-zone is enough, the efficiency of grouting can reach 44.6%, the recoverable coal resources 9.4 × 107 kg and the drilling amount 930 m along the inclining direction.