下保护层开采对上覆工作面矿压显现的影响研究

 依据淮南矿区顾桥矿下保护层的地质和开采技术条件，采用计算机数值模拟（FLAC5.02D）系统和现场工程实践相结合的方法对保护层开采后被保护层在增压区、卸压区矿压显现规律异同研究。研究结果表明：充分采动后卸压区内被保护层垂直、水平应力集中系数降低为0.31和0.34，而增压区应力集中系数最大为1.68和1.55，卸压区被保护层顶板破坏程度较增压区大。工程实践结果表明，被保护工作面增压区的周期来压步距是卸压区1.6倍，巷道围岩变形量比卸压区小。

Study on the Infulence of Lower Protective Seam Mining to the Strata Behaviors at Overlying Working Face

Based on geological and mining technical conditions of protective layer mining in Huai Nan mining area Gu Qiao Mine，in the same time，by using method of combining computer numerical simulation (FLAC5.02D) systems and on-site engineering practice，the similarities and differences of the strata-pressure behavior between pressurized area and distressed zone in the protected layer after mining the protective layer are studied．The results showAfter efficiently mining，the protected layer’s vertical and horizontal stress concentration factor in distressed zone decreased to 0.31 and 0.34，however the utmost stress concentration factor in the pressurized area is 1.68 and 1.55；The destructiveness of the protected roof in the distressed zone is more serious than that in the pressurized area．The practice results show that the distance of periodic weighting in the pressurized area is 1.6 times as the one in the distressed zone，and the deformation of surrounding rock is smaller than the one in the distressed zone．