基于坚硬顶板和近距离煤层群耦合开采条件作业空间安全隐患较大的问题,采用离散元软件对该条件下采动覆岩运移规律及顶板应力演化特征进行了研究。结果表明:老顶及上下层位坚硬顶板的垮落形态分别呈“W”型、“V”型和“U”型;开采初期,上下层位坚硬顶板协同弯曲运动,工作面回采70 m后,二者间出现离层并随工作面推进(90 m和110 m)出现2次突然垮落;顶板岩块水平应力与垂直应力的变化决定其运动状态。 Based on the large potential safety hazard in the working space due to the coupled mining conditions of hard roof and close distance coal seam group, the discrete element software was used to study the law of overlying strata movement and the roof stress evolution characteristics. The results show that the caving patterns of the hard roof at the top of the roof and the upper and lower floors are “W”, “V” and “U”, respectively. In the initial stage of mining, After 70 m of working face was demolished, the two layers suddenly separated from each other and fell suddenly with the working face (90 m and 110 m). The horizontal and vertical stress of roof rock changed its motion state.