本文通过地面钻孔电视观测资料的分析,指出难冒坚硬顶板前期活动、相对暂时稳定,同时叙述了后期活动特点与关系。结合浅部开采地表塌陷资料,重点论述了顶板后期活动时作用层位高度与切冒特殊型式。介绍了难冒坚硬顶板冒落极限范围统计资料得出长宽比例和边缘支撑的重要作用,说明应用“板”的结构形式的必要性。并从薄板理论的适用条件,上覆岩层破坏参数,分析指出采场难冒坚硬上覆岩层的结构应按厚板考虑。 Based on the analysis of ground borehole TV observation data, this paper points out that it is difficult to take the hard roof early activities and is relatively temporary stable, at the same time it narrates the characteristics and relations of later activities. Combined with the information of surface subsidence in shallow mining, the paper mainly discusses the function of the bedding height and the special type of cut-off when the roof is in late stage. This paper introduces the important role of aspect ratio and edge support in the calculation of the ultimate limit of failure of hard roof, and shows the necessity of applying the “plate” structure. According to the applicable conditions of the thin plate theory, the failure parameters of overlying strata are analyzed. It is pointed out that the sturdy sturdy stratum structure should be considered as thick slab.