锚杆的分析模型 毕业论文外文翻译

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1、第10页Analyticalmodelsforrockbolts.C.L*,StillborgAbstractThreeanalyticalmodelshavebeendevelopedforrockbolts:oneforboltssubjectedtoconcentratedpullloadinpullouttests,oneforboltsinstalledinuniformlydeformedrockmasses,andoneforboltssubjectedtotheopeningofind

2、ividualrockjoints.Thedevelopmentofthemodelshasbeenbasedonthedescriptionofthemechanicalcouplingattheinterfacebetweentheboltandthegroutmediumforgroutedbolts,orbetweentheboltandtherockforfrictionallycoupledbolts.Forrockboltsinthepullouttests,theshearstress

3、oftheinterfacesexponentiallywithincreasingdistancefromthepointofloadingwhenthedeformationiscompatibleacrosstheinterface.Decouplingmaystartfirstattheloadingpointwhentheappliedloadislargeenoughandthenpropagatetowardsthefarendoftheboltwithafurtherincreasei

4、ntheappliedload.Themagnitudeoftheshearstressonthedecoupledboltsectiondependsonthecouplingmechanismattheinterface.Forfullygroutedbolts,theshearstressonthedecoupledsectionislowerthanthepeakshearstrengthoftheinterfacewhileforfullyfrictionallycoupledboltsif

5、isapproximatelythesameasthepeakshearstrength.Forrockboltsinstalledinuniformlydeformedrock,theloadingprocessoftheboltsduetorockdeformationhasbeentakenintoaccountindevelopingthemodel.Modelsimulationsconfirmthepreviousfindingsthataboltinsituhasapick-upleng

6、th,ananchorlengthandneutralpoint.Itisalsorevealedthatthefaceplateplaysasignificantroleinenhancingthereinforcementeffect.Injointedrockmasses,severalaxialstresspeaksmayoccuralongtheboltbecauseoftheopeningofrockjointsintersectingthebolt.1.IntroductionRockb

7、oltshavebeenwidelyusedforrockreinforcementincivilandminingengineeringforalongtime.Boltsreinforcerockmassesthroughrestrainingthedeformationwithintherockmasses.Inordertoimproveboltingdesign,itisnecessary:tohaveagoodunderstandingofthebehaviourofrockboltsin

8、deformedrockmasses.Thiscanbeacquiredthroughfieldmonitoring,laboratory第10页tests,numericalmodelingandanalyticalstudies.Sincethe1970s,numerousresearchershavecarriedoutfieldmonitoringworkonrockboltsinstalledinvariousrockformations.Fr