【摘要】 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。更多还原

【Abstract】 Changes of roof rock composite and the layer thickness,the difference of stability are significant.According to the layered composite roof roadway conditions,composite roof problem on the changed thickness are studied through the geological investigation,drilling peep instrument testing field and the theory analysis and calculation method. Research shows that it will be divided into 4 categories in accordance with the layer thickness of gangue size,namely stable roof,medium stable roof, unstable roof and extremely unstable roof.更多还原