原位錨桿載荷狀態(tài)分析-畢業(yè)設計外文資料翻譯

1、英文原文ANALYSISOFINSITUROCKBOLTLOADINGSTATUSD.H.S.ZouDept.ofMiningEngineeringDalhousieUniversityCanadaAbstract:Rockboltsarewidelyusedinrockengineeringfgroundstabilization.Theanchagequalitytheloadingstatustheboltintegrityare

2、ofmostconcerninthefield.Rockboltsperfmanceiscurrentlyassessedbypullouttquewrenchtests.Thesemethodsaredestructiveinaccuratecannotprovidealltherequiredinfmation.Consequentlysomeresearchisdirectedtonondestructivetestingmeth

3、ods.Howeverduetothecomplexgroundconditionstheloadingmechanismofrockboltsitisstillachallengetomonittherockboltperfmanceinsituquantitativelyaccurately.Thetensiondistributionalongaboltfvarioustypesofboltsisoftennotwellunder

4、stood.Theconditionofthesurroundingrockmassthevaryingfieldstressesfurthercomplicatetheproblem.Thisarticlewillthoughlyanalyzemobilizationoftheanchingfcedistributionofthebolttensionfmechanicallyanchedgroutedpretensionedunte

5、nsionedrockbolts.Thetermsloadbearingcapacityanchagequalityofrockboltswillbeclarified.Theeffectsofgroundmovementwillalsobeexaminedwithaninsightintothefuturedirectionfrockbolttestingmoniting.Keywds:rockbolttensionnondestru

6、ctivetestloadcapacityanchagequality.1.IntroductionRockboltsarewidelyusedfgroundsupptinrockengineeringsuchasinhighwayslopeshydrodamsundergroundminewkingsopenpithighwalls.Basedoninstallationrockboltsmaybeclassifiedasmechan

7、icallyanchedfullypartiallygrouted(withresincement)frictionbolts.Thegroutedboltsmayalsohaveabearingplatewithinitialtension.Theprimaryfunctionofrockboltsistoholdtherockmasstogetherincreasemaintainthegroundstability.Inthefi

8、eldtheanchagequalitytheloadingstatustheboltintegrityaremostconcerned.Atpresentthecommonpracticeofassessinganchagequalityisbypullouttest(Choquet1991)sometimesbytquewrenchtest(Seeber1992).Bothmethodshavelimitedcapabilityca

9、nnotprovidealltheneededinfmation.Theyaretimeconsumingdestructiveinaccurate.Otherresearchers(Thurner1988Hiraoetal2001BeardLowe2003)havebeentryingtousenondestructivetesttechniquetomonitrockboltsinthefield.Howeverduetotheco

10、mplexgroundconditionstheloadingmechanisminarockboltsystemthetechnologycannotbeapplieddirectly.Itisstillachallengetomonittherockboltperfmancequantitativelyaccurately.Firstofallmobilizationoftheanchingfcedistributionoftheb

11、olttensionfvarioustypesofrockboltsarenotwellunderstood.TheconditionoftheFailureofaboltcanbeavoidedbyinglargerdiameterboltsinstallingmebolts.Ffullygroutedboltstheanchagecapacityincreaseswiththelengthofthegroutedsegmentcan

12、exceedtheboltbreakingfce.Failureofagroutedboltmaynotleadtothecompletefailureoftherockboltsystem.3.DeterminationofanchagestrengthcapacityTheanchagestrengthofagroutedboltdependsonthegroutmaterialthegroutingquality.Assumeth

13、egroutingqualityisthesamearoundthebolttheanchagestrengthcanbedeterminedbythefollowingequation:(1)()assTdx???whereistheboltdiameteristhegroutshearstrengthwhichmayd()sx?varywiththelocationalongthebolt.xTheanchagecapacityof

14、agroutedboltistheaccumulatedanchagestrengthovertheentiregroutedlengthisdeterminedbyintegration:(2)0()()gLacsTdxdx????whereLgisthegroutedlength.IfthegroutingqualityisunifmthroughoutthelengthwithequalanchagestrengthEquatio

15、n(2)issimplifiedas:()sx?(3)acsgTdL???Itshouldbepointedoutthattheanchagecapacitymaybedeterminedoverasegmentofthegroutedlengthinsomecases.FbothmechanicalgroutedboltsTaccanbedeterminedbypullouttestifthefailureisthroughthean

16、chage.Fgroutedboltstheaverageanchagestrengthcanthenbedeterminedby:(4)asacgTTL?theaveragegroutshearstrengthby:(5)sacgTdL???4.EensionmobilizationdistributioninunifmmediaThegrouttherockmassareassumedtobeunifmthegroundmoveme