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1、第35卷第4期煤炭学报Vo.l35No.42010年4月JOURNALOFCHINACOALSOCIETYApr.2010文章编号:0253-9993(2010)04-0580-06低透气性煤层群高瓦斯采煤工作面强化抽采卸压瓦斯机理及试验121232221卢平,袁亮,程桦,薛俊华,刘泽功,童云飞,王永,蔡如法,邓中(1安徽建筑工业学院土木工程学院,安徽合肥230022;2淮南矿业集团公司,安徽淮南232001;3安徽理工大学能源与安全工程学院,安徽淮南232001)摘要:针对低透气性高瓦斯煤层群首采卸压层瓦斯涌出量
2、大、瓦斯治理困难的现实条件,在模型试验和理论研究的基础上,揭示出煤层群首采关键卸压层开采后采动影响区内顶、底板岩层裂隙的动态演化规律和卸压瓦斯运移规律,发现采空区侧存在竖向裂隙发育区,弯曲下沉带和底板膨胀变形带内煤体发生膨胀变形,煤层的透气性显著增加。2371(1)工作面煤气共采实践表明,工作33面最大绝对瓦斯涌出量7046m/min,平均5671m/min,瓦斯抽采率达852%,其中抽采的高浓度瓦斯比例为6725%,抽采的低浓度瓦斯比例为3275%,保证工作面的安全回采,实现了煤与瓦斯安全高效开采。关键词:低透气性;煤层群;高瓦斯;强化抽采;卸压瓦斯
3、中图分类号:TD7126文献标志码:ATheoryandexperimentalstudiesofenhancedgasdrainageinthehighgasfaceoflowpermeabilitycoalmultiseams12123LUPing,YUANLiang,CHENGHua,XUEJunhua,LIUZegong,2221TONGYunfei,WANGYong,CAIRufa,DENGZhong(1SchoolofCivilEngineering,AnhuiUniversityofArchitecture,Hefei23002
4、2,China;2HuainanMiningGroupCo,Huainan232001,China;3InstituteofEnergyandSafetyEngineering,AnhuiUniversityofScienceandTechnology,Huainan232001,China)Abstract:Onthebasisofmodeltestandtheoryresearchfortheproblemofhighgasemissionwhenminingthekeycoalseaminthemultiseamscoalofthehighlyg
5、ascontentandlowpermeabilityandthedifficultactualconditionofgascontro,lthepermeabilityofthecoalseamsignificantlyincreasesbecauseoftheexistenceoftheverticalcrevassegrowthareabesidethemineddirection,thecurvingsubmergedbeltandthebulgydeformationbandinthemotherboardincoa,lwhichisverybene
6、fitforgasdrainage.Theresearchprovidestheoryfordisposingminingholesduringtheprocessofstressreliefandgasmininginthekeyminingstressrelieflayerofcoalmultiseams.ThekeyremoteminingofPanyiCoalMine2371(1)workfacegasminingontheworkingsurfacerevealsthatthemostgreatlyabsolutegase33missionquan
7、tityis7046m/min,average5671m/min.Thegasdrainagerateamountsto852%.Besides,highconcentrationgasdrainagerateupto6725%andlowconcentrationgasjustonly3275%.Theexperimentresultshowsthattheutilizationofcoalandgasminingtogethernotonlycontrolsworkfacegasemission,butalsoachievesminingclean
