基于声发射定位的岩石裂纹动态演化过程研究-赵兴东

265Vol.26No.520075ChineseJournalofRockMechanicsandEngineeringMay20072006111620061226(50490270)(50474017505740225067402550504005)(2005038253)(2006018)(1975)[e-mail](110004)TU45A10006915(2007)05094407STUDYONCRACKDYNAMICPROPAGATIONPROCESSOFROCKSAMPLESBASEDONACOUSTICEMISSIONLOCATIONZHAOXingdongLIYuanhuiYUANRuifuYANGTianhongZHANGJianyongLIUJianpo(SchoolofResourcesandCivilEngineeringNortheasternUniversityShenyangLiaoning110004China)AbstractAcousticemission(AE)whichisproducedbythemicro-cracksoccurrenceorgrowthisaubiquitousphenomenonassociatedwithbrittlefractureinmanymaterials.AEtechniquecanbeusedtomonitorthemicro-cracksdevelopmentintherocksamplecontinuouslyandin-real-timewhichisbetterthanothermethods.AElocationtechniqueisemployedtostudyrockfailureprocess.ItisinvestigatedusinggranitesampleswithdifferentprecutcracksandAEsensorsaremountedonthesurfaceofthesample.AGeigerlocationalgorithmallowsAEeventlocationfromfirstarrivaltimestobedeterminedbyAEsensorswhichisappliedtostudythecrackinitiationandpropagationprocessalsotoanalyzethecrackspatialevolutionmodewithstresschangingduringthetotalloadingprocess.TheexperimentalresultsshowthatAEactivityrepresentsdifferentcharacterswithstress-strainchangingduringthetotalloadingprocessthequantityoftheAEeventsisverylittlefromtheinitialloadingtocrackinitiationwhentheinitialcrackgeneratesAEeventsapparentlyincreaseAEeventsareinquietperiodaftercrackinitiationuptothetimebeforecrackpropagationAEactivitysharplyincreasesfromcrackstablepropagationuptocrackunstablepropagationespeciallyincrackunstablepropagationstepAEevents265.•945•reachtothemostquantityinthedivisionstrain.ThereisvoidspaceofAEeventsduringtheAElocationresultsthevoidspaceofAEeventsisthepositionofmacroscopiccrackbreakthroughwhichcanbeusedtopredictthecrackbreakthroughpositionofrocksamples.MeanwhileAElocationresultsarealsodirectreflectionofinteriorstressfieldpropagationprocess.AElocationresultsalsoreflectdirectlythespatialpositiondirectionandspatialcurvedfaceofcrackpropagationintherocksamplewhichisverysignificanttostudythemechanismofrockfailure.Keywordsrockmechanicsacousticemission(AE)rockfailureuniaxialloadingcrackpropagationprocess1()[1][2]CT(computerizedtomography)[3][4]L.X.Wu[256][379]SEMCT[10][1113](acousticemissionAE)[1415][1625]K.Mogi[17][18][25]2P(S)[2631][32])()()()(P222ttzzyyxxiiii−=−+−+−ν(1)(1)1Fig.1LocationerrorofAEevents33.105mm•946•2007()70mm70mm150mm()32123Fig.2Threekindsofgranitesampleswithdifferentprecutcracks1Table1Physico-mechanicalparametersofgranite/MPa/MPaP/(m·s1)S/(m·s1)558237600.2239202840(3)3(1)(NYL5005000kN)(2)(3)3Fig.3AEexperimentalsystem3.2ESG(4)810MHz100mV125750kHz40dB020dBAEAE4Fig.4AEmonitoringsystemanditsdataprocessingsystem44.1535(0%20%)20%30%12330%60%123(60%80%)1(a)1(b)2(c)330mm30mm30mm5mm5mm5mm8A/D3D265.•947•20%30%30%60%60%80%80%100%(a)120%30%30%60%60%80%80%100%(b)220%30%30%60%60%80%80%100%(c)353Fig.5TestingresultsofAEeventslocationofthreekindsofrocksampleswithdifferentprecutcrocksduringcrackpropagationprocesses234.263641(OA)2(AB)Kaiser3(BCENUENUENU•948•200763Fig.6CumulativeAEeventswithstress-strainchangingofthreekindsofrocksampleswithdifferentprecutcracks)80%90%4(CD)5()(7)0.032.6MPa(7(a))32.6MPa(7(b))52.0MPa71.4MPa(7(c))(75.5MPa)(7(d))(a)32.6MPa(b)46.9MPa(c)71.4MPa(d)75.5MPa7Fig.7TestingresultsofAEeventslocationduringcrackpropagationprocess7(d)(8)ENUADCB0510152025303540450.0000.0020.0040.0060.0080.0100.0120.014/µε(b)2/MPa50010001500200025000OABCD0246810121416180.0000.0020.0040.0060.008/µε(a)1/MPa5001000150020002500300035000O0510152025303540450.0000.0020.0040.0060.0080.0100.012/µε(c)3/MPa0500100015002000250030003500BCDA265.•949•8Fig.8AEeventsvoidspaceandcrackpropagationzone6(1)(2)(3)(4)(References)[1]SCHEDLAKRONENBERGAKTULLISJ.DeformationmicrostructuresofbarregraniteanopticalSemandTemstudy[J].Tectonophysics1986122(1/2)149164.[2]WULXCUICYGENGNGetal.Remotesensingrockmechanics(RSRM)andassociatedexperimentalstudies[J].Int.J.RockMech.Min.Sci.200037(6)879888.[3].[J].199211(3)284294.(ZHAOYonghongWANGRen.Real-timeobservationofmicrofracturingprocessinrockduringcompressiontest[J].ChineseJournalofRockMechanicsandEngineering199211(3)284294.(inChinese))[4].[J].199716(4)368374.(TANGChun′an.NumericalsimulationofAEinrockfailure[J].ChineseJournalofRockMechanicsandEngineering199716(4)368374.(inChinese))[5].[J].200120(2)139146.(WULixin.Remotesensingrockmechanicsanditsrecentachievementsandfuturedevelopment[J].ChineseJournalofRockMechanicsandEngineering200120(2)139146.(inChinese))[6]WULXLIUSJWUYHetal.Changesininfraredradiationwithrockdeformation[J].Int.J.RockMech.andMin.Sci.200239(4)825831.[7].[J].19866(4)1621.(XUJiangLIHe.Experimentalresearchonmicrofractureprocessofsandrockunderuniaxialcompression[J].MechanicsandPractice19866(4)1621.(inChinese))[8].[J].199312(4)304312.(LINGJianmingSUNJun.Onmesocrackdamageofbrittlerockanditstime-dependentcharacteristics[J].ChineseJournalofRockMechanicsandEngineering199312(4)304312.(inChinese))[9].CT[J].199618(2)1920.(YANGGengsheXIEDingyi.CTidentificationofcoalandrockdamagepr