瀝青混合料細觀結構初步分析.pdf

1、III]IILIilllllllllllllllllll：HIIIII[IY1526343分類號：U41；U2壤鄉(xiāng)太海碩士學位論文瀝青混合料細觀結構初步分析張愛霞導師姓名職稱鄭傳超教授申請學位級別項士學科專業(yè)名稱道路與鐵道工程論文提交日期學位授予單位2009年4月28日論文答辯日期2009年5月21日長安土學答辯委員會主席王選倉教授學位論文評聞人冷培義教授李煒光副教授AbstractTraditionaldesignmethodfora

2、sphaltpavementphenomenologicallyfocusesonthemechanicalpropertiesofasphaltconcretematerialsfromamacroperspective，withanassumptionthatthematerialisisotropicandhomogeneous，whichisdifficulttevealthephysicalmechanismofmateria

3、ldeformationanddistressTheasphaltmixtureismuchmorecomplicatedInthispaperasphaltmixtureisregardedasamulti—phasecompositematerialsystem，anditsmesostructureispreliminarilysimulatedinthefollowingthreeaspectsFirstlytwodimensi

4、onalfmiteelmentmodelisestablishedforthemesostructureofasphaltmixtureinthecasesofbothsingleaggregateandmultipleaggregates，theeffectsofaggregateswithdifferentsizes，shapes，andlocationssubjectedtodifferentloadingconditionsar

5、estudiedResultsshowthatinternalstressesofdifferenttypesofasphaltmixturedependmainlyonthematerialgradationAllofthesewillprovideabasisforasphaltmixturedesignandaggregatesselectionSecondlysurfacetexturestructurehasallimport

6、antroleinthepavementperformanceThesimplemodelforstrippingofasphaltmixtureisproposedtolocatethestressdistributionsontheinterfacebetweenasphaltmaxtureandanaggregateofdifferentshapesanddepthsunderdifferentloadingsFinallythi

7、spapercomparesthenonhomogeneousMarshallspecimensandthehomogeneousMarshallspecimensthroughsplittingtestandnumericalsimulationtestdatademonstrateAthatnonhomogeneityinducesanisotrpicpropertiesForagivensegregationformularfor

8、elasticmodulusofasphaltmixtureMarshallspecimenintwodirectionsperpendicularareobtained，whichisofreferencevalueforthesegregationanalysisKeywords：asphaltmixture，meso—structure，numericalsimulationpavementsurfacetexturespliRi