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1、英文原文ANALYSISOFINSITUROCKBOLTLOADINGSTATUSD.H.S.ZouDept.ofMiningEngineering,DalhousieUniversity,CanadaAbstract:Rockboltsarewidelyusedinrockengineeringforgroundstabilization.Theanchoragequality,theloadingstatusandtheboltintegrityareofmostconcerninthefiel
2、d.Rockboltsperformanceiscurrentlyassessedbypulloutortorquewrenchtests.Thesemethodsaredestructiveorinaccurateandcannotprovidealltherequiredinformation.Consequentlysomeresearchisdirectedtonon-destructivetestingmethods.However,duetothecomplexgroundconditi
3、onsandtheloadingmechanismofrockbolts,itisstillachallengetomonitortherockboltperformanceinsituquantitativelyandaccurately.Thetensiondistributionalongaboltforvarioustypesofboltsisoftennotwellunderstood.Theconditionofthesurroundingrockmassandthevaryingfie
4、ldstressesfurthercomplicatetheproblem.Thisarticlewillthoroughlyanalyzemobilizationoftheanchoringforceanddistributionofthebolttensionformechanicallyanchored,grouted,pre-tensionedandun-tensionedrockbolts.Thetermsloadbearingcapacityandanchoragequalityofro
5、ckboltswillbeclarified.Theeffectsofgroundmovementwillalsobeexaminedwithaninsightintothefuturedirectionforrockbolttestingandmonitoring.Keywords:rockbolttension,non-destructivetest,loadcapacity,anchoragequality.1.IntroductionRockboltsarewidelyusedforgrou
6、ndsupportinrockengineering,suchasinhighwayslopes,hydrodams,undergroundmineworkingsandopenpithighwalls.Basedoninstallation,rockboltsmaybeclassifiedasmechanicallyanchored,fullyorpartiallygrouted(withresinorcement)andfrictionbolts.Thegroutedboltsmayalsoha
7、veabearingplatewithinitialtension.Theprimaryfunctionofrockboltsistoholdtherockmasstogetherandincreaseormaintainthegroundstability.Inthefield,theanchoragequality,theloadingstatusandtheboltintegrityaremostconcerned.Atpresentthecommonpracticeofassessingan
8、choragequalityisbypullouttest(Choquet1991)andsometimesbytorquewrenchtest(Seeber1992).Bothmethodshavelimitedcapabilityandcannotprovidealltheneededinformation.Theyaretimeconsuminganddestructiveorinaccurate.Otherresearchers(Thurner1988,Hir
