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采用理论分析、数值计算、相似模拟以及现场实测相结合的方法,分析了厚及特厚煤层工作面采空区顶板垮落高度.研究表明,关键层理论计算分析适用于岩性坚硬、结构完整的顶板条件;考虑顶板挠曲与矸石碎胀影响的采空区顶板垮落高度计算方法具有一定的普适性,得到了影响采空区顶板垮落高度的因素为煤层开采高度、顶板破断块体碎胀系数以及顶板分层极限挠曲变形量;2种理论分析结果给出大同矿区同忻煤矿8105工作面采空区坚硬顶板的垮落高度分别在143m与76~141m,实测得到的顶板垮落高度为80~120m,理论值与实测值基本一致,验证了2种理论分析方法的正确性.
The roof caving height of goaf in thick and ultra-thick coal seam face is analyzed by the method of theoretical analysis, numerical calculation, similarity simulation and on-the-spot measurement.The results show that the calculation and analysis of key layer theory is suitable for the hard rock with intact structure The calculation method of the roof caving height considering the deflection of the roof and the broken of waste rock has a certain generality and the factors affecting the roof caving height of the goaf are the coal mining height, The coefficient of body expansion, and the ultimate delamination deformation of roof; the theoretical analysis results show that the caving height of hard roof in the gob of 8105 working face in Datong Mine is 143m and 76 ~ 141m, respectively. The measured roof The collapse height is 80 ~ 120m, the theoretical and measured values are basically the same, verify the correctness of the two theoretical analysis methods.