煤岩动力灾害电磁辐射预测技术中力电耦合方法的研究及应用

2411Vol.24No.1120056ChineseJournalofRockMechanicsandEngineeringJune20052004021620040410(0423204238)(03JTY2005)(E50335)(1971)[e-mail]11221(1.4112012.221008)FLACFLAC(EME)TD713.1A10006915(2005)11188107STUDYANDAPPLICATIONOFCOUPLINGBETWEENEMEANDSTRESSINELECTRO-MAGNETICALEMISSIONPREDICTIONTECHNOLOGYFORCOALORROCKDYNAMICALDISASTERXIAOHong-fei1FENGTao1HEXue-qiu2WANGEn-yuan2ZHUChuan-qu1(1.CollegeofEnergyandSafetyEngineeringHunanUniversityofScienceandTechnologyXiangtan411201China2.CollegeofEnergyScienceandEngineeringChinaUniversityofMiningandTechnologyXuzhou221008China)AbstractThepresentsituationandprogresstrendofelectro-magneticemission(EME)predictiontechnologyforrockorcoaldynamicaldisastersareanalyzed.OnthebasisoftherelationshipbetweenEMEsignalandloadingstressduringdeformationandfractureofcoalorrockthecouplingmethodsbetweenEMEandstressarestudiedbasedonFLACsimulationforstressfieldandEMEpropagation.Theresultsshowthatthecouplingrelationshipcanbeexpressedbythricemultinomialapproximately.Theelectromagneticemissionsignalwillincreasewiththeincreaseofloadingstresswhichapproximatelyconformstothricemultinomial.TherearerelativelylargeinfluencesontheEMEintensityorpulseinloadingstressandloadingspeed.Thehigherthestressandloadingspeedarethestrongerthesignalofelectromagneticemissionproducedis.ThecouplingresultsofcalculationshowthattheEMEsignalsincreasewiththeincrementofloadingspeedorthestrengthofcoalorrock.ThecouplingmethodbetweenEMEandstressbasedonFLACanalogycanreliablyascertainthestressconcentrationfieldsandproperlysimulatethedistributionrulesofEMEsignalincoalorrockstratum.Itprovidesakindofnewapproachtoelectromagneticemissionmonitoringtechnologyforthepurposeoftheapplicationofmonitoring•1882•2005EMEtothepredictionofdynamicaldisasterphenomenasuchascoalorrockoutbursts.ItcanalsoprovidereliablytheoreticalbasisfortheuseofEMEmethodandtechnologytopredictandforecastrockorcoaldynamicaldisasters.IthasimportantmeaningforperfectingtheEMEmonitoringanddetectingtheoryandpromotingtherelateddisciplines.FinallyaprospectfortheresearchontheEMEpredictiontechnologyforrockorcoaldynamicaldisasterinthefutureispresented.KeywordsrockmechanicsrockorcoaldynamicaldisastersforecasttechnologycouplingbetweenEMEandstresselectro-magneticemission(EME)deformationandfractureofcoalorrock12002410000t60132003111517(6/)11()[12][35]22.1()()2()()qRDK20402411.•1883•MJY1[6]V30(V3030min)KVV309m3/tKV0.725m[7]2.2[8][9][10][11][12][13]RC[11][13]()[14](1)(2)()(3)EMEEMEEME[15](1)1MHz(2)•1884•200533.1[14](1)−=∑01NNEεσ(1)∑Nε∆0N[13]3.2FLAC11Fig.1Schematicdiagramofresearchingroute[16]0111m)(bbbbfEnnnn+∆+⋅⋅⋅+∆+∆==−−σσσσ(2)()()1(mV)(MPa)0.901yxTable1FittingequationsofEMEstrengthvs.axialstressR21#y=0.0093x3+0.4273x21.8869x+33.55600.95462#y=0.0029x3+0.0379x2+2.1787x+18.56500.96703#y=0.0045x30.1358x2+2.4442x+18.84800.96061#y=0.0063x3+0.0246x2+0.2494x+9.47370.94722#y=0.0167x30.2836x2+1.9758x+11.38400.91531#y=0.0012x3+0.0313x2+0.5400x+8.54490.95572411.•1885•)(i23imee)(eertrrtdcbaEEβωαγωσσσ−−−+++==(3))(mmtEE=t)(tσσ=tabcdEFLAC(fastLagrangiananalysisofcontinua)Itasca6a1992FLAC[17]FLACFLAC[16]25EMEEME35m2EME()Fig.2EMEvs.loadingtimeforcoalorrock3EMEFig.3ExperimentalresultsofEMEstrengthvs.loadingtime4EMEFig.4EMEdistributionalongexcavationdirectionofhead-on5EMEFig.5PracticalEMEvalueswithdifferentboringdepthsFLAC4303540455055600123456789/m/mV640062006000580056005400520050004800460044004200400038003600340032003000EME010000200003000040000246/EME0•1886•20052(1)(2)[17](1)(2)(3)5(1)1(2)(3)(4)(References)[1].[M].2002.(DouLinmingHeXueqiu.GeophysicsofMining[M].BeijingChinaScienceandCulturePress2002.(inChinese))[2].[M].2002.(DouLinmingHeXueqiu.TheoryandTechnologyofRockBurstPrevention[M].XuzhouChinaUniversityofMiningandTechnologyPress2001.(inChinese))[3].[M].2003.(HeXueqiuWangEnyuanNieBaishengetal.ElectromagneticDynamicsofCoalorRockRheology[M].BeijingSciencePress2003.(inChinese))[4]NieBaishengHeXueqiuWangEnyuanetal.Macroandmicro-mechanismofeffectofEMEonCBMadsorptionincoal[A].InProc.the1stMineEnvironmentandVentilationSymposium[C].IndiaSciencePress2000.121128.[5]HeXueqiuWangEnyuanLiuZhentang.Experimentalstudyontheelectromagneticradiation(EMR)duringthefractureofcoalorrock[A].InProceedingsofthe′99InternationalSymposiumonMiningScienceandTechnology[C].BeijingSciencePress1999.133136.[6].[J].199826(3)6065.(ShiXianxinCaiShuanrongFengHongetal.Thepredictionofcoalandgasoutburstusingtheacousticemissiontechnique[J].CoalGeologyandExploration199826(3)6065.(inChinese))[7].[J].1996(5)17.(SuWenshu.Probingintothepredictionofcoalandgasoutburstwithdynamicindexofgasemission[J].CoalEngineer1996(5)17.(inChinese))[8].[J].200113(3)2430.(MaYuhuWangPeilinWuHongyan.2411.•1887•Preliminarydiscussiononelectromagneticradiationandseismogenicprocess[J].PlateauEarthquakeResearch200113(3)2430.(inChinese))[9].[J].199113(2)254258.(XiongHao.Newprogressinelectromagneticradiationresearchofearthquake[J].ActaSeismologicaSinica199113(2)254258.(inChinese))[10].[J].198932(2)173177.(GuoZiqiangYouJunhanLiGaoetal.Modelofelectronemissio