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丰城石溪煤矿区地层较复杂，上覆地层厚，松散易坍，砾岩坚硬且胶结性弱。灰岩岩溶裂隙发育，钻孔漏水严重。长兴下部含燧石结核灰岩含硅质量高，达88％岩石可钻性9～10级，部分11级。煤系地层软硬相间，频繁迭换。煤层薄、层次多，夹矸多，见煤位置不易掌握。老山段水敏性地层极不稳定易造成垮坍，超径和缩径，常发生多种复杂事故。整个矿区地
The strata of Fengshi coal mine in Fengcheng are more complicated with overlying strata thick, loose and prone to collapse, and conglomerate hard and with weak cementing. Limestone karst fracture development, serious drilling leaks. Changxing lower chert-containing limestone with high silicon content, up to 88% rock drillability 9 to 10, part of 11. Coal strata between soft and hard, frequent Diego. Seam thin, multi-level, more than Gangue, see the location of coal is not easy to grasp. Laoshan section of the water-sensitive formation is very unstable and easily lead to collapse, over diameter and diameter, often a variety of complex accidents. The entire mining area