采动影响区被保护煤层渗透率分布规律  

Permeability distribution law of protected coal seam in mining-affected zone

作　　者：程斌 赵龙 李志梁[2] CHENG Bin;ZHAO Long;LI Zhiliang(Xi’an Research Institute, China Coal Technology and Engineering Group Corp., Xi’an 710077, China;College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710077 [2]西安科技大学能源学院,陕西西安710054

出　　处：《煤田地质与勘探》2017年第3期77-81,86,共6页Coal Geology & Exploration

基　　金：中煤科工集团西安研究院有限公司科技创新基金项目(2015XAYQN14)~~

摘　　要：为了更好地进行采动影响区被保护煤层瓦斯抽采工作,以淮南矿区某矿某工作面为例,使用物理相似模拟、FLAC3D数值模拟、采动区渗透率历史拟合等方法,探讨上部被保护煤层采动影响范围及渗透率变化规律。结果表明:被保护煤层有着明确的区域划分,走向剖面工作面前方卸压区长约20 m,工作面后方卸压区长约30 m,裂隙张开区长约30 m,裂隙张开区之后为重新压实区;明确了各区域的渗透率变化范围,工作面前、后方卸压区渗透率为(150~250)×10^(-3)μm^2,裂隙张开区渗透率为(400~800)×10^(-3)μm^2,重新压实区渗透率为(15~100)×10^(-3)μm^2,采动区被保护煤层渗透率在采动过后,较原始渗透率增大32~1 600倍。In order to better conduct the gas drainage in a mining-affected zone,a working face and its protected coal seam of a mine in Huainan mining area were used as the research object.Physical similarity simulation,FLAC3D numerical simulation,historical fitting have been used to discuss the variation of the permeability of the protected coal seam on the target working face.The results show that for the protected coal seam in strike section,the length of the pressure relief area in the front of the working face is about20m,and the length of the pressure relief area in the back of the working face is about30m,the length of the fracture zone is about30m,and the rest is the re-compaction area.The permeability in pressure relief area is150×10-3μm2to250×10-3μm2,the permeability of the fracture zone area is400×10-3μm2to800×10-3μm2,and the permeability of re-compaction area is16×10-3μm2to100×10-3μm2.The permeability of the protected coal seam in the mining area increased by32~1600times compared with the original permeability.

关 键 词：采动区 渗透率 保护层开采 瓦斯抽采 

分 类 号：TD313[矿业工程—矿井建设]