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382Vol.38No.220093JournalofChinaUniversityofMining&TechnologyMar.2009:2008205227:(50427401);(973)(2005cb221505);(863)(2006AA06Z119);(2006BAK03B02204,2007BAK29B01);(NCET20620477);(2007A002);(07KF12):(19782),,,,,.E2mail:leezhonghui@163.comTel:0516283884695,,,,(,,221008):,.,,,016019,;,.,.,.:;;;;:TD713;P319.1+9:A:100021964(2009)0220187206StudyonCharacteristicsandRulesofSurfacePotentialDuringCoalFractureLIZhong2hui,WANGEn2yuan,LIUZhen2tang,SONGXiao2yan,LIYan2na(SchoolofSafetyEngineering,StateKeyLaboratoryofCoalResourcesandMineSafety,ChinaUniversityofMining&Technology,Xuzhou,Jiangsu221008,China)Abstract:Thesurfacepotentialofcoalwasstudiedduringdifferentfracturemodes,includinguniaxialcompression,tensilefractureandthree2pointbending.Theresultsshowthatasurfacepotentialisproducedduringthefractureofcoalandthatthesurfacepotentialhasagoodcorre2spondencetotheload:thecorrelationcoefficientbetweenthemcanbeasgreatas0.6to0.9.Thechangeinloadinducesthechangeinthesurfacepotential.Thelargertheloadthehigherthesurfacepotentialbecomes,andviceversa.Themagnitudeofthesurfacepotentialisnotthesameatelectrodeslocatedindifferentpositionsonthecoalsample.Thedifferencesalsochangealongwiththechangeinloadandthefracturestateofthecoalsample.Basedonthecorrelationbetweensurfacepotentialandload,thestatusofacoalfracturingunderloadmaybedeter2minedfromthesurfacepotential.Keywords:coal;fractureunderload;surfacepotential;rules;rnechanisms,.,[127].©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[8211].,.,,().,,,.A.B.[12].[13],.[14215],.EnomotoY[16].TakeuchiA[17],40mV35pA.,..,,?[18].,.11111a,.1Fig.1Surfacepotentialexperimentsystem1b,,,,:1)16,16bit;2)2,1100Hz,1001000Hz,1200s,;3),40db;4)50,4,,5M,,1,2,4,84;5),..,50mm100mm50mm50mm,,;50mm50mm100mm,,.112:1),881©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.),,,,..3),,0(0),,,.4),.5),,.221150mm100mm,,.2.3.,,,9mV.().3b135131s,,,1#,2#,3#,4#,,5#.,230s,.,,.2Fig.2Electrodesarrangementoncoalsampleofuniaxialcompression3Fig.3Surfacepotentialexperimentresultsofcoalsampleunderuniaxialcompression212,4.4Fig.4Electrodesarrangementoncoalsampleoftensiletest.5,,,.5a,2,1.2,,,2,2.5b,,,,,(1981©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.),,15mV;,1#6#,,.,(),.5Fig.5Surfacepotentialexperimentresultsofcoalsampleintensilefracture2136,,.6,,3,2,1.7..,.65s,,4mV.,,,.,,1#,2#,4#,;3#,5#,6#,,.6Fig.6Electrodesarrangementoncoalsampleofthree2pointbendingtest7Fig.7Surfacepotentialexperimentresultsofcoalsampleunderthree2pointbending2148.8,,016019,,,.,()(),,019.091©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.),,,,,,;,,,,;,,,,,,.2),.,,,,,,,,,.,,,,;,,,,.3),5%10%,,,,[19]..41),,,.,,,,,,;,.,,,,,,,.2),016019,,;,,019.3).,.4),.,,.191©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[1],.[M].:,1999:1082111.[2],,,.[J].,1998,26(3):60265.SHIXian2xin,CAIShuan2rong,FENGHong,etal.CoalandgasoutburstforecastwithAEtechnology[J].CoalGeology&Exploration,1998,26(3):60265.[3],.[J].:D,1998,28(1):41246.WULi2xin,WANGJin2zhuang.Experimentalstudyofinfraredradiationfeaturesofcoalandrocksunderloading[J].ChinaScience:D,1998,28(1):41246.[4].[J].,2000,27(5):17219.FANShuan2bao.Newmethodsforcoalandgasout2burstforecastinhomeandabroad[J].MiningSafety&EnvironmentalProtection,2000,27(5):17219.[5]FRIDVI,SHABAROVAN,PROSKURYAKOVVH,etal.Formationofelectromagneticradiationincoalstratum[J].JMiningScience,1992,28(2):1392145.[6],.[M].:,1995:22238.[7].[D].:,1997.[8],,,.[M].:,2003:3892407.[9]FRIDV.Rockbursthazardforecastbyelectromag2neticradiationexcitedbyrockfracture[J].RockMe2chanicsandRockEngineering,1997,30(4):2292236.[10],,,.[J].,2000,29(3):2252229.WNAGEn2yuan,HEXue2qiu,NIEBai2sheng,etal.Principleofpredictingcoalandgasoutburstu2singelectromagneticemission[J].JournalofChinaUniversityofMining&Technology,2000,29(3):2252229.[11],,,.[J].,2003,28(4):3662369.WANGEn2yuan,HEXue2qiu,LIUZhen2tang,etal.Electromagneticradiationdetectorofcoalorrockdynamicdisastersanditsapplication[J].JournalofChinaCoalSociety,2003,28(4):3662369.[12].[C]//MA..,,,,.:,1993:80287.[13],,.[J].,1990,33(2):2082211.WUXiao2ping,SHIXing2jue,GUOZi2qiang.Studyontheelectrificationofgranitesamplesundercompression[J].ChineseJournalofGeophysics,1990,33(2):2082211.[14],,,.[J].,2004,47(3):4752482.HAOJin2qi,LIULi2qiang,LONGHai2li,etal.Newresultoftheexperimentonself2potentialchangeofrocksunderbiaxialcompression[J].Chi2neseJournalofGeophysics,2004,47(3):4752482.[15].[D].:,2003.[16]ENOMOTOY,SHIMAMOTOT,TSUTUMIA,etal.Rapidelectricchargefluctuationpriortorockfracturing:itspotentialuseforanimmediateearth2quakeprecursor[C]//HAYAKAWAM,FUJINA2WAY.ProceedingsofInternationalWorkshoponE2lectromagneticPhenomenaRelatedtoEarth2quakePrediction.Tokyo:TerraScientificPublishingCo,1993:64265.[17]TAKEUCHIA,BOBBYWSL,FRIEDEMANNTF.Currentandsurfacepotentialin