路面結(jié)構(gòu)層應(yīng)力非線性特性反演研究.pdf

1、大連理工大學(xué)博士學(xué)位論文路面結(jié)構(gòu)層應(yīng)力非線性特性反演研究姓名：梁新政申請(qǐng)學(xué)位級(jí)別：博士專業(yè)：水工結(jié)構(gòu)指導(dǎo)教師：孔憲京20000101AbstractTherehasbeenabout20yearsforthestudyofpavementIayerpropertiesbackanalysisbasedonFallingWeightDeflectometer(FWD)deflexiontesting，fromwhichsomeresear

2、cheshavebeenusedprogressivelyinactualengineeringAt廿1esalTletimemostofpresentbackanalysistheoriesRrebasedonmultilayerediinearelastichypothesisandquasistaticanalysismethod，whichnonlinearcharacteristicanddynamiceffectarejgn

3、oredAtpresenLmultileveledIoadregressionanalysisisusedtoreflectthenonlinearperformanceapproximatelybutbiggisherrormaybeintroducedforgreatdifferencebetweenthemethodandactualpavementlayerpropertiesSoitisnecessarytodevelopdy

4、namicbackanalysismethodbysimulatingnonlinearcharacteristicrationallyInthispaperpavementlayerpropertiesbackanalysisisstudiedsystemicallyintegratedwithdefiniteoptimizationtechniqueThemainresearchresultsateasfollows：1Thenon

5、linearleastsquareoptimizationtechniqueisimprovedtoofferbeaerperformanceonstabilityandspeedofconvergenceAlso，itisutilizedinthebackcalculationofpavementlayerproperties2nlreenonlinearconstitutivemodelsincludingvolumestressm

6、odel，k，～^，modelandbilinearmodelarechosentosimulatedifferentmaterialsThenquasi—staticdeformationandS仃eSSunderFWDloadiscomputedFurthermorenonlinearstaticbackanalysistheoryofpavementlayerpropertiescombiningwithnonlinearleas

7、tsquareoptimizationtechniqueisputforwardThroughbackanalysisoftheoreticandactualdeflectionbasin，rationalityandnumericalstabilityareprovedThus，thebackanalysismethodofthispapercartgivesatisfactoryresultinidentifmgpavementla

8、yernonlinearproperties3DynamicequilibriumequationofpavementstructureresponseunderFWDpulse10adisestablishedbymeansofvolumestressmodelandbilinearmodelSurfacedeflectionhistoryisobtainedthrourghstepbystepintegrationprocedure

9、NonlineardynamicbackanalysistheoryofpavementlayerpropertiesisresearchedinwhichimprovednonlinearleastsquareoptimizationtechniqueisintegratedAnalysisofexamplesdemonstratesthatmorerationalandreliableresultcanbereachedfoTnon

10、linearcharacteristicanddynamiceffectbeingconsideredsimultaneously4FWDdeflectiontestingandlinearstatic，nonlinearstatic，lineardynamicandnonlineardynamicbackanalysisareconductedoneachlayerofoneselectedpavementduringconstruc

11、tionActualapplicationindicatesthatinsomecaseslinearstaticbackana]ysismayresultinunreasonablyvalues，whereasnonlineardynamicbackanalysiscangiverationalresultFinallyapplicabilityofeachmethodisanalyzed，whichcanbeusedasrefere