10-南非公路路面加速加载试验评估和创新技术领跑世界50

南非公路路面加速加载试验评估和创新技术领跑世界50年SouthAfricanAdvancedAPT(AcceleratedPavementTesting)InnovativeTechnologyLeadingWorldDuring50Years王于晨杨焕岭李梓迩YuchenWang,JanGrundling&LizlSteynbergSACTCC&CFE,TshwaneUniversityofTechnology(TUT)南非茨瓦尼理工大学TUT/南非-中国交通合作中心SACTCCBeijing2010年4月9日北京Introduction简介•Roadstransport80-90%GoodsandPeople•公路运输占货物和乘客的80-90%•NationalRoadAct:Implementedfrom1935•国家公路法于1935年起实行•NationalRoadPeakConstructionPeriods:1970-80&2010WorldCup公路大发展阶段•CurrentRoadNetworkMap南非公路网MainRoadNetworksinSouthAfricaMainRoadNetworksinSouthAfrica国家公路网路面状况SouthAfricanRoadNetworkLength(km2005)南非公路网里程kmClassificationsRuralUrbanTotalPrimary450003000075000Secondary200002500045000Tertiary29500011000405000Total360000165000525000BridgesofSouthAfrica公路桥梁•概况•建成时期•主要型式•新结构和新材料建设标准和规范(Specificationsandcodes)•共22套•具有鲜明特点---结合公路实际,以APT路面加速加载试验数据为基础,制订出标准和规范•超载重载运输管理立法•在中国科技部国外工程图书馆馆藏RoadManagement南非公路管理•分国家,省和地方三级•南非国家公路署(半政府机构)•收费公路•2010年世界杯足球赛路网交通更新管理APT路面加速加载1.Deflectionrelatedtostressandstrain2.Ruttingrelatedtodeformation3.Stiffnesschangesrelatedtoresponseandperformance4.DistressMechanismsandrelatedmodelsandtransferfunctionsa.Deformationruttingb.Flexuralperformancefatigueandcrackingc.Sheardeformation/crackingd.Environmentalresponseandperformancehot/cold/wet/dryWhatdowewanttoknowandwhy?(cont)续1.Loadingraterelatedtostressandstrain2.Rangeofvalidityofcharacteristicsrelatedtoextrapolationandpredictionofofresponseandperformance3.EffectofAgingrelatedtoresponseandperformance4.EffectofDensificationrelatedtoresponseandperformance5.EffectofMaterialPropertiesrelatedtoresponseandperformance6.Validationofanalyticaltools•第一代1960-1970•第二代1980-1990•第三代1990-2003•第四代2004-现在ApplicationsMMLSMMLS3LabsUSEuropeAfricaMLS(MobileLoadSimulator)•VaryingSizeofFacility不同比例MMLS3-1/3scale三分之一MLS10-full-scale足尺MLS66-full-scale足尺•MobileTestingFacility移动式测试多种工况InnovativeTechnologicalToolsforEvaluatingMLSAPTResponseandPerformance(cont)续•MultipleWheelTrains•LateralWander•VaryingTestLength•VaryingSpeedandFrequency•VaryingTyrePressures•VaryingTyreTread•VaryingLoadAmplitudeMMLS3-ScaledAPTDeviceMLS10–TestSetupMozambique同济大学和辽宁省交科院UNIQUEMLSCHARACTERISTICSCOMPAREDTOOTHERLINEARTRAFFICKINGDEVICESMLS的加载独特特点CHARACTERISTICCOMPARISONCONCLUSIONS/COMMENTSCumulativeloadapplicationsinunittimeMLSOTHER•MLSCapitalcostperloadapplication•MLSdependentonoverloadingforacceleration.oBeneficialfortestingstressdependentmaterialsUNIQUEMLSCHARACTERISTICSCOMPAREDTOOTHERLINEARTRAFFICKINGDEVICES续CHARACTERISTICCOMPARISONCONCLUSIONS/COMMENTSTimeperAPTtestbasedonnumberofloadapplicationsMLSgreaterthanorequaltoOTHERS•MLSOperationalcostperloadapplicationoMLSflexibilityforselectingtestprotocols•TestingofparallelsectionsinsequencepossibletoachievesimilarenvironmentalconditionsUNIQUEMLSCHARACTERISTICSCOMPAREDTOOTHERLINEARTRAFFICKINGDEVICES续CHARACTERISTICCOMPARISONCONCLUSIONS/COMMENTSRangeoffrequencyandspeedMLSOTHERS•Frequency,SpeedandLoadinfluencePorepressuresandpumpingoMLSscopeforstudyingwetsurfacetrafficking•Performanceofvisco-elasticmaterialsdiffersduetoloadfrequencyoMLSscopeforstudyingHMAUNIQUEMLSCHARACTERISTICSCOMPAREDTOOTHERLINEARTRAFFICKINGDEVICES续CHARACTERISTICCOMPARISONCONCLUSIONS/COMMENTSUni-directionaltraffickingwithlateralwanderMLSdoesnotusebi-directionaltraffickingtogainloadapplicationsassomeOTHERS•PorepressuresandpumpingaffectedoMLSsimulatesperformanceofjointedpavementsbetter•ResidualstressesinAsphaltaffectedoMLSsimulatesperformancebetterMMLS3TyrecontactstressesbeingmeasuredbySIMofCSIRReferdeBeerandSadzikSATC2007MMLS3TestinginconjunctionwiththeHVSonN4nearPretoriaMODIFIEDBENKELMANBEAM上海同济大学