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煤层顶板岩性复合及分层厚度变化大,稳定性差异显著。针对巷道层状复合顶板条件,通过地质调查、现场钻孔窥视仪测试、理论分析计算等方法,对变化的复合顶板问题进行了研究。按照夹矸厚度的大小,将顶板分为4类:稳定顶板、中等稳定顶板、不稳定顶板及极不稳定顶板。
The top layer of the coal seam has a large variation of lithologic compound and delamination thickness with significant difference in stability. Aiming at the conditions of lamellar composite roof, the problems of the complex composite roof are studied through the methods of geological investigation, field drilling penetrometer test, theoretical analysis and calculation. In accordance with the thickness of gangue gangue, the roof is divided into four categories: stable roof, medium stable roof, unstable roof and very unstable roof.