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大同矿区二号煤层顶板是坚硬顶板中(岩石压强80～160MP_a)最典型的难冒煤层,一直被迫采用刀柱开采法,从而造成了顶板大面积来压、自然发火、煤柱集中应力等安全隐患。限制了综合机械化的发展和生产效率的提高。因此,大同矿务局在总结过去对坚硬顶板处理经验的基础上,与有关单位合作,在云岗矿二号煤层8143工作面首次对厚砾
Datong Coal Mine No.2 seam roof is a hard roof (rock pressure 80 ~ 160MP_a) the most typical hard to take coal seam, has been forced to adopt the method of pillars, resulting in a large area to the roof pressure, spontaneous combustion, pillars stress concentration Security risks. Limiting the development of integrated mechanization and production efficiency. Therefore, on the basis of summarizing the past experience of handling hard roofs, Datong Mining Bureau, in cooperation with the relevant units, conducted the first large-gravel