该文通过对皖北刘桥矿区4、6煤层顶板部分钻孔岩芯裂隙统计,基于岩石质量指标并不能很好反映沿钻孔裂隙间距(结构面密度)的变化、块度的大小以及对小于10cm薄弱带的信息反映不够,该文运用分形理论的方法对刘桥矿区4、6煤层顶板岩体质量进行了定量评价。结果表明,分维值能够较好地反映煤层顶板的岩体质量。 Based on the statistical analysis of rock core fissures in the roof of 4 and 6 coal seams in Liuqiao mining area in northern Anhui, the change of fissure spacing along the borehole (structural plane density), the size of block and The information of weak zone less than 10cm does not reflect enough. This paper uses fractal theory to quantitatively evaluate the rock mass quality of 4,6 seam roof in Liuqiao mining area. The results show that the fractal dimension value can well reflect the rock mass quality of coal seam roof.