半剛性基層瀝青混凝土路面反射裂縫形成擴(kuò)展機(jī)理與基層預(yù)裂技術(shù)研究.pdf

1、河北工業(yè)大學(xué)碩士學(xué)位論文半剛性基層瀝青混凝土路面反射裂縫形成擴(kuò)展機(jī)理與基層預(yù)裂技術(shù)研究姓名：岳福青申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：楊春風(fēng)20040101半剛性基層瀝青路面反射裂縫形成擴(kuò)展機(jī)理與基層預(yù)裂技術(shù)研究STUDYONTHEINITIATIONANDPROPAGATIONMECHANISM0FREFLECTIVECRACKINASPHALTPAVEMENTANDINDUCEDCRACKTECHNoLOGYABSTRACTR

2、eflectivecrackingwhichseriouslyaffectpavementfatiguelifeanddrivingsafetyiswidelyexistedinourcountry’shighwayandbecomeintoahardproblemtodealwithTr蕊cloadandtemperatureloadaretwomainfactorsaccountingforitsformationandpropag

3、ationInthispaperlinearfracturemechanicsisemployedtogiveafullanalysistothemechanismofreflectivecrack’spropagationandthereasonablespacingoftheinducedcracktechnologyisstudiedaswellFirstlyafterdepictingthesingularityofstress

4、fieldatthetopofcrack，thefiniteelementmethodtocalculatestressintensityfactorofplainfractureproblemsisfoundedSecondlythestructuralresponseofpavementsufferingreflectivecrackingisdeeplyanalyzedintermsoftrafficloadandthermall

5、oadAsfor枉蕊cloadtwosituationwereanalyzed。symmetricalIoadandasymmetricload，ineachofthem，cracktop’stensionstreSS，shearstressandstressintensityfactorwerecalculatedalsotheefrcctofstructuralparameterswereanalyzedPavement’stemp

6、eraturedistributionfieldwhensufferingsuddentemperaturedroppingwasnumericalsimulatedCracktop’stensionstressandstressintensityfactorcausedbvthermalstresswerecomputedstructuralparameters’sensitivityanalysisweremadeaswellThe

7、nreflectivecrack’spropagationmodelundertrafficloadcoupledwithtemperature10adwasanalyzedAtlast，reflectivecrack’spropagationspeedofdifferentpavementstructuralcombinationwasanalyzedtooTheanalyzingresultindicatedthatreflecti

8、vecrack’spropagationmodelisdecidedbythestressattopofthecrackwhichoftenisacompoundpropagationmodelByparameteranalysis，reflectivecrack’spropagationpotentialandspeedarealsoclearedThirdlytakingintoaccountthermalstress師ctionb

9、etweensurfaceandbaseandfrictionbetweenbaseandsoftamechanicalmodelrepresentingthepavementincludinginducedcrackisfoundedThemaximaltensionstressesinsurfaceandbasebetweeninducedcrackhavebeenobtainedbyparametricanalysisThellt

10、akingthemaximaltensionstressinsurfaceandbaseandthestressintensityfactoratthetopoftheinducedcrackasrestrainingindexes，methodtodeterminethereasonableinducedspacinghasbeendeterminedKEYWORDS：pavementstructure，reflectivecrack