锚杆的分析模型 毕业论文外文翻译

《锚杆的分析模型 毕业论文外文翻译》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

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

2、idualrockjoints.Thedevelopmentofthemodelshasbeenbasedonthedescriptionofthemechanicalcouplingattheinterfacebetweentheboltandthegroutmediumforgroutedbolts,orbetweentheboltandtherockforfrictionallycoupledbolts.Forrockboltsinthepullouttests,theshearstressofth

3、einterfacesexponentiallywithincreasingdistancefromthepointofloadingwhenthedeformationiscompatibleacrosstheinterface.Decouplingmaystartfirstattheloadingpointwhentheappliedloadislargeenoughandthenpropagatetowardsthefarendoftheboltwithafurtherincreaseintheap

4、pliedload.Themagnitudeoftheshearstressonthedecoupledboltsectiondependsonthecouplingmechanismattheinterface.Forfullygroutedbolts,theshearstressonthedecoupledsectionislowerthanthepeakshearstrengthoftheinterfacewhileforfullyfrictionallycoupledboltsifisapprox

5、imatelythesameasthepeakshearstrength.Forrockboltsinstalledinuniformlydeformedrock,theloadingprocessoftheboltsduetorockdeformationhasbeentakenintoaccountindevelopingthemodel.Modelsimulationsconfirmthepreviousfindingsthataboltinsituhasapick-uplength,anancho

6、rlengthandneutralpoint.Itisalsorevealedthatthefaceplateplaysasignificantroleinenhancingthereinforcementeffect.Injointedrockmasses,severalaxialstresspeaksmayoccuralongtheboltbecauseoftheopeningofrockjointsintersectingthebolt.1.IntroductionRockboltshavebeen

7、widelyusedforrockreinforcementincivilandminingengineeringforalongtime.Boltsreinforcerockmassesthroughrestrainingthedeformationwithintherockmasses.Inordertoimproveboltingdesign,itisnecessary:tohaveagoodunderstandingofthebehaviourofrockboltsindeformedrockma

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