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论述了悬顶对采煤工作面顶板管理及造成底板突水的危害，并着重介绍了陶阳矿９９０４ 工作面泥灰岩顶板进行人工放顶的一些经验及作法。
The roof control of coal mining face and the water inrush from the floor are discussed. Some experiences and practices of manual roofing of marl roof in 9904 working face of Taoyang Mine are emphatically introduced.