层间接触对半刚性沥青路面力学响应的影响

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1、西南交通大学硕士学位论文层间接触对半刚性沥青路面力学响应的影响姓名：刘红坡申请学位级别：硕士专业：道路与铁道工程指导教师：邱延峻20060501西南交通大学硕士研究生学位论文第

2、l页AbstractThecurrentSpecificationsfbrDesignofHighwayAsphaltPavement(JTJ014—97)(SDHAP)isbasedlayeredelastictheory，whichassumesthattheimerfacebetvreen1ayerscantransferforceanddenectionfunv．However，itisproVedd

3、uringengineeringpracticethatmeadhesionbetweenmelayersofthepaVementstructureispoor，theadhesionqualityisbetweenabsolutelyslipperya11dwholecontinuous，andt11einterfacetraIlsferforcebvcontact．Then．thedesignpointofpavememisnotcoincidentwithitsactivestate，whichw订1influencetheaccuracyoftheperfornlance’

4、sevaluation．Itisbettertousecomactmodeltoanalysisthemechanicalresponseofpavementthantraditionalcontinuousnlodel．Generally，aunifomcircularverticalcontactstressiscommonIyassumedinrepresentingwheelloadsinpavementanalysisprocedures．However’experimentalmeasurementshaVeshownmatanon-uniformrectangularv

5、enicalcomactstressismore印propriate，especi甜lywhenthevehicleisoverloaded．TheobjectiVeofthepaperwastopresentthedi任brenceofmechanicalresponseoftwokindsofmodelapplieddi船rentloads．Tbcarryoutthjsobjective，three—dimensional(3D)finiteelement(FE)programisusedtopredictthemechanicalresponseofsemi—rigidbase

6、pavement．The3DFEpmgranlpermitstoinputnon—unifonnvenicalrectangularcontactpressureatvariousa)(1eIoadandhorizontalstressflomthetireswhenvehiclesstartorbrake．Intheseanalvses．thedenectiononthepavementsurface，themaximumprincipalstressatthebottomOftheasphaltlayerandsemi—rigidbase，theminimuInprincipal

7、strain0nthetopofsubgradeandthemaximumshearingstressatthebottomoftheasphaltlayerwerepredicted．Theremarkabledi丘brenceisthemaximumprincipalstress，whichresultsf}omthetraditionalcontinuOusmodelistoosmalltoworktheitemabouttensilestressoftheexistingSDHAPmatmemaximumDrincipalstressatthebottomoftheaspha

8、ltlayerandsemi．rigidbaseshouldneverexcesstheperrnissibletensilestressofcorrespondingmaterial．0nthecontrary，themaximumprincipalstress矗om廿1econtactmOdelismuchbiggerandmore西南交通大学硕士研究生学位论文第6页数据较为离散，标准误差较大。不过，这些公式可以表明各种因素对路面性能的影响程度。由于这