石门揭煤钻孔布置优化分析及应用.pdf

摇 第36卷第2期 煤摇 摇 炭摇 摇 学摇 摇 报 Vol.36摇 No.2摇 摇 2011年 2月 JOURNAL OF CHINA COAL SOCIETY Feb.摇 2011摇 摇 摇 文章编号:0253-9993(2011)02-0283-05 石门揭煤钻孔布置优化分析及应用 卢义玉,刘摇 勇,夏彬伟,张摇 赛 (重庆大学 西南资源开发及环境灾害控制工程教育部重点实验室,重庆摇 400030) 摘摇 要:为优化突出煤层石门揭煤钻孔布置,在理论分析射流割缝影响半径的基础上,提出基于高 压脉冲水射流割缝技术的钻孔布置的新工艺。 在理论分析圆形紊动射流结构的基础上,研究了射 流冲击破碎煤体时射流速度分布,基于动量守恒定律得出射流作用于煤体的应力分布。 并选取重 庆某煤矿K1煤层煤体制作原煤煤样进行孔隙率测试和单轴压缩实验,得出煤体的初始损伤和煤 体力学参数,基于损伤力学对煤体发生损伤破坏的门槛值进行了计算,得出射流冲击煤体的最大深 度和钻孔切缝后影响半径,并应用于重庆某煤矿+175N2 号石门揭煤工程。 应用结果:钻孔数量减 少32 个,减少钻尺718郾4 m,钻进工程量减少35郾7%。 关键词:石门揭煤;钻孔;影响半径;高压脉冲水射流 中图分类号:TD713郾3摇 摇 摇 文献标志码:A The novel technology of drilling arrangement of rock cross鄄cut coal uncovering basing on theoretical analysis LU Yi鄄yu,LIU Yong,XIA Bin鄄wei,ZHANG Sai (Key Laboratoryfor the Exploitation of South West Resources the Environmental Disaster Control Engineering,Ministry of Education,Chongqing University, Chongqing摇 400030,China) Abstract:To optimize the drilling arrangement of rock cross鄄cut coal uncovering,a novel technology which was using high pressurewaterjettoslotcoal seamwaspresentedbasedontheoreticalanalysisof influenceradius.Themaincon鄄 tentswere asfollowed,the velocity and stressdistributionwasanalyzedwhenwaterjet,whichwasviewed asturbulent jet,slottedcoal.Andthentestedthemechanicalpropertiesandporosity of coal sampleof K1coal seaminaChongqing coalmine.Basedontheparametersof coalsampleanddamagemechanicsgotbyuniaxialcompressionandporositytest experiments,threshold of coal damage failure and influence radius of slotting were developed.Finally,experimentized in a rock cross鄄cut coal uncovering of a Chongqing coal mine,the application results show that the drilling number is reduced32,th