大同煤田是我国顶板最坚硬、难冒落、难控制的矿区之一。我国从70年代初推广综合机械化以来,通过对国外引进和国内仿制研制的多种支架架型的使用,结合生产实践作了许多机械支护与顶板合理控制和管理的试验研究,积累了一些经验。1986年采用我国研制的TZ720型强力支架,在云岗煤矿厚层砾岩顶板中辅以顶板注水措施,首次实现了坚硬顶板下的综合机械化,为我国坚硬顶板下 Datong Coalfield is China’s roof the most hard, difficult to fall, difficult to control one of the mines. Since the promotion of the comprehensive mechanization in the early 1970s, our country has made a lot of experimental research on mechanical support and rational control and management of the roof through the use of a variety of support frames imported from abroad and domestic imitation, and accumulated some experiences . In 1986, TZ720-type strong support developed by our country was used, which was supplemented by the roof water injection in the thick conglomerate of Yungang Coal Mine. It realized the comprehensive mechanization under hard roof for the first time,