锚杆的分析模型 毕业论文外文翻译

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1、第13页Analyticalmodelsforrockbolts.C.L*,StillborgAbstractThreeanalyticalmodelshavebeendevelopedforrockbolts:oneforboltssubjectedtoconcentratedpullloadinpullouttests,oneforboltsinstalledinuniformlydeformedrockmasses,andoneforboltssubjectedtotheopeningofindividualrockjoints.Thedevelop

2、mentofthemodelshasbeenbasedonthedescriptionofthemechanicalcouplingattheinterfacebetweentheboltandthegroutmediumforgroutedbolts,orbetweentheboltandtherockforfrictionallycoupledbolts.Forrockboltsinthepullouttests,theshearstressoftheinterfacesexponentiallywithincreasingdistancefromth

3、epointofloadingwhenthedeformationiscompatibleacrosstheinterface.Decouplingmaystartfirstattheloadingpointwhentheappliedloadislargeenoughandthenpropagatetowardsthefarendoftheboltwithafurtherincreaseintheappliedload.Themagnitudeoftheshearstressonthedecoupledboltsectiondependsonthecou

4、plingmechanismattheinterface.Forfullygroutedbolts,theshearstressonthedecoupledsectionislowerthanthepeakshearstrengthoftheinterfacewhileforfullyfrictionallycoupledboltsifisapproximatelythesameasthepeakshearstrength.Forrockboltsinstalledinuniformlydeformedrock,theloadingprocessofthe

5、boltsduetorockdeformationhasbeentakenintoaccountindevelopingthemodel.Modelsimulationsconfirmthepreviousfindingsthataboltinsituhasapick-uplength,ananchorlengthandneutralpoint.Itisalsorevealedthatthefaceplateplaysasignificantroleinenhancingthereinforcementeffect.Injointedrockmasses,

6、severalaxialstresspeaksmayoccuralongtheboltbecauseoftheopeningofrockjointsintersectingthebolt.1.IntroductionRockboltshavebeenwidelyusedforrockreinforcementincivilandminingengineeringforalongtime.Boltsreinforcerockmassesthroughrestrainingthedeformationwithintherockmasses.Inordertoi

7、mproveboltingdesign,itisnecessary:tohaveagoodunderstandingofthebehaviourofrockboltsindeformedrockmasses.Thiscanbeacquiredthroughfieldmonitoring,laboratory第13页tests,numericalmodelingandanalyticalstudies.Sincethe1970s,numerousresearchershavecarriedoutfieldmonitoringworkonrockboltsin

8、stalledinvariousrockformations.Fr