Mechanistic-empirical
JournalofModernTransportation
V olume19,June2,January2011,Page114—133
Journalhomepage:jmt.swjtu.edumI#^10r●b￡■l^,Sit^
sdfgMechanistic?empiricalpavementdesignguide(MEPDG):
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QiangLI,DannyX.XIAO,KelvinC.P.WANG,KevinD.HALL,Y anjunQru
i.DepartmentofCivilandEnvironmentalEngineering,UniversityofDelaware.Newark,DE 19711.USA
2.DepartmentofCivilEngineering,UniversityofArkansas,Fayetteville,AR72701,USA
3.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China Abstract:Pasteditions
oftheAmericanAssociationofStateHighwayandTransportationOff icials(AASHTO)Guide forDesignofPavementStructureshavervedwellforveraldecades;nevertheless.manys eriouslimitationxist
fortheircontinueduasthenation'sprimarypavementdesignprocedures.Rearchersaren owincorporatingthelat—estadvancesinpavementdesignintothenewMechanistic—EmpiricalPavementDesignGuide(MEPDG),developed
undertheNationa1CooperativeHighwayRearchProgram(NCHRP)1—37Aprojectandadoptedandpublishedby
AASHTO.TheMEPDGprocedureoffersveraldramaticimprovementsoverthecurrentpa vementdesignguideand prentsanewparadigminthewaypavementdesignisperformed.However,MEPDGissubst antiallymorecomplex thantheAASHTODesignGuidebyconsideringtheinputparametersthatinfluencepavemen
tperformance,including
困境的意思
traffic,climate,pavementstructureandmaterialproperties,andapplyingtheprinciplesofeng ineeringmechanicsto
predictcritica1pavementrespons.Itrequiressignificantlymoreinputfromthedesigner.So meoftherequireddata areeithernottrackedpreviouslyorarestoredinlocationsnotfamiliartodesigners.andmanyd atatsneedtobepre-
headcountsdousrearchworkhasbeenconductedan dstillmorechallenges
needtobetackledbothinfedera1andstate1evelsfortheful】implementationofMEPDG.Thispaper,forthefirsttime, providesacomprehensivebird'yeviewfortheMEPDGprocedure.includingtheevolveme ntofthedesignmethod-
ology.anoverviewofthedesignphilosophyanditscomponents,therearchconducteddurin gthedevelopment,im—
provement.andimplementationphas,andthechallengesremainedandfuturedevelopmen tsdirections.Itisantici- patedthattheeffortsinthisPaDeraidinenhancingthemechanistic—empiricalbadpavementdesignforfuturecon—tinuousimprovementtokeepupwithchangesintrucking,materials,construction,designcon cepts,computers,andsoon.
Keywords:designofpavementstructures;mechanistic—empiricalpavementdesignguide(MEPDG);localcalibration; implementationchallenges
◎2011JMTAllrightsrerved.
1.Intr0ducti0n
1rheAmericanAssociationofStateHighwayOffi一
上cials(AASH0,RoadTestwasamilestoneforen. gineerstounderstandhowpavementsperforln,badon
wchthecurrentAmericanAssociationofStateHigh—wavandTransportation0fficials(AASHTO)pavement designproceduresweredeveloped.However.thede. signproceduresareinsu伍cientforthetraffic.materials andconstructiontechniquestodaysincetheempirica1 equationsinnaturewere
derivedfromtheRoadTestin asinglegeographiclocation,onetypeofsubgrade,one hotmixasphaltmixtureandonePortlandcementcon—ReceivedMrdy4,2011;revisionacceptedJun.7,2011 Correspondingauthor.Te1.：十l一302—831?7002 E—mail:************(Q.LI)
doi:10.39694.issn.2095—087X.2011.02.007 cretemixture,twounboundba,andunderslightly
over1millionaxleloadapplicationsf1].
Itisunti1now.ahalfcenturyaftertheRoadTest.that piricalmethod.DevelopedundertheNa—tionalCooperativeHighwayRearchProgram(NCHRP), theMechanistic—EmpiricalPavementDesignGuide (MEPDG)prentsanewparadigmforpavementdesign andanalysis.TheGuideconsidersinputparametersthat influencepavementperformance.includingtrafile,cli- mate,andpavementstructureandmaterialproperties,and appliestheprinciplesofengineeringmechanicstopredict criticalpavementrespons[1】.Incorporatinghundreds ofnewvariables,newparameterstocharacterizemateri. alsandthecomplexityoftheimplementation.MEP
DG prentsmanyrearchtasksandchallengesforthe pavementcommunity. SincetheAASHTOJointTaskForceonPavement函授报名
okc(JTFOP)initiatedtheMEPDGdevelopmentefforts, JournalofModernTransportation201119f2):114—133 numerousrearchprojectsrelatedtoMEPDGhave beenconducted.Althoughawiderangeoftopicshave beeninvestigatedandfindingshavebeendisminated byreports,Papersandprentations,there1snopaper comprehensivestudycatalogingtherearch achievements.ThisPaperisintendstofillthisgap.The outlineofthepapercomesasfollows.First,thehistory ofpavementdesignmethodsisreviewed,followedbya briefintroductionofMEPDGanditscomponents.Sec—ond.theart—of-staterearchconductedduringthede—velopment,improvement,andimplementationphasof MEPDGareexploredandanalyzed.Finallychallenges andfuturedevelopmentsareprented.
2.EvolvementofpavementdesigninU.S. Theempiricalbadandthemechanistic—empirical badpavementstructuraldesignapproachesarethetwo principalmethodswidelystudiedandudintheUnited Statestoday.
2.1.Empiricalmethod."AASHTOpavementdesign method Manypavementdesignproceduresadoptane
mpiri—calapproach.Therelationshipsamongdesigninputs, suchas1pads.materials.1ayerconfigurationsandenvi. ronment,andpavementfailurewereobtainedthrough engineeringexperience,experimentalobrvations,ora combinationofboth. TheAmericanAssociationofStateHighwayand TransDonation0fficialsfAASHTO)GuideforDesign
story什么意思ofPavementStructures『21istheprimarydocument udtodesignnewandrehabilitatedhighwaypave. mentsintheUnitedStatestoday.TheFederalHighway Administration'sfFHWA,l995.1997NationalPave—mentDesignReviewfoundthatmorethan80%ofstates uthe1972,1986,orl993AASHTOGuides『3].A1l versionsoftheAASHTOdesignguidearebadonem. piricalmodelsdrawnfromfieldperformancedatameas. uredattheAASHOroadtestinthelate1950slocatedat iustnorthwestofOttawa,Illinois,about80milessouth. westofChicago.alongwithsometheoreticalsupportfor 1ayercoefficientsanddrainagefactors.Theoverallr—viceabilityofthepavementisquantifiedbytheprent rviceabilityindex(psi),acompositeperformance measurecombiningcracking,patching,rutting,and otherdistress.Roughnessisthedominantfactorgov—erningPSIandisthereforetheprincipalcomponentof pavementperformancemeasure. Thevariousversi
onsoftheAASHTOguidehave rvedtheindustrywell,buthavedeficienciesdueto someofthelimitationsoftheAASH0RoadTest[1]: 115
(1)Today'strafficloadsaremuchhigherthanthey weresixdecadesago;
(2)Rehabilitatedpavementswerenotmonitored;
(3)Onlyoneclimaticconditionandonesubgrade typewereincludedintheroadtest;
(4)Onlyonehot—mixasphaltandonePCCmixture werestudied;
怎么能快速美白亚洲基础设施投资银行>tarty(5)Testpavementsdidnotincludedrainage;
