特厚煤层覆岩力学性能及“两带”高度影响分析

Analysis on the Mechanical Properties of Overlying Rock in Extra Thick Coal Seam and the Influence of "Two Belts" Height

大同矿区存在双系煤层开采,煤层顶板多为坚硬岩层。中煤塔山煤矿现开采石炭系3-5^(#)号煤层,面临极近距离煤层群15 m以上特厚煤层综放开采覆岩破坏复杂的问题,通过采取力学测试、现场实测、理论分析等方式,研究该矿井覆岩力学性质测试,分析得出岩层控制的主、次关键层,为中煤塔山煤矿未来开采工作面的水害防治、矿压控制等提供依据。

In Datong mining area,there are double coal seam mining,and the roof of coal seam is mostly hard rock.In China Coal Tashan Coal Mine,the 3-5^(#)coal seam of Carboniferous system is currently being mined,which is faced with the complex problem of overburden failure in fully mechanized caving mining of extremely close coal seam group over 15 m thick coal seam.By means of mechanical test,field measurement and theoretical analysis,mechanical property test of overburden rock in the mine is studied,the primary and secondary key strata controlled by rock strata are analyzed.It provides the basis for water damage control and mine pressure control of China Coal Tashan Coal Mine in the future.