无砟轨道路基结构动力特性与影响因素的-研究

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1、西南交通大学硕士研究生学位论文第1I页AbstractBallastlesstrackiswidelyappliedinthebuildingofhighspeedrailwayandpassengerdedicatedlinewithitsadvantagesofhighstability,highridecomfortandfewmaintenance．Asthebasisfortheballastlesstrack，soilsubgrade，especiallythebedding，holdsuptheloadinggeneratedwhenthetrai

2、nrunsathighspeed．Theballastlesstrack-subgradedynamicalresponsegeneratedbythevibrationloadingoftrainisacomplexdynamicprocess，involvedthreefactorswhicharevehicles，trackandsubgrade．Therefore，wemustresearchdynamiccharacteristicsofthebedding，determinethedisciplineofdynamicstress，deformmio

3、nandaccelerationinthebedding．Inthisway,wecanguiderationaldesignofballastlesstrack-subgradestructure．Thispaperisbasedonthegroundoftheexperimentlineofsui—yurailway．Theauthoradoptstheoreticalanalysis，integratingfieldinvestigationandnumericalsimulation，studyingonthedynamicalresponseofbal

4、lastlesstrack-subgradestructure．Themainresearchworkandconclusionasfollows：(1)Thispapercomprehensivelysummarizesthestatusandproblemsofvehicles-track—subgradestructure’Sdynamicalresponse，overviewstheballastlesstrackstructurestylesandtheircharacteristic，discoursesthesubgradestiffnesswhi

5、chmatchsballastlesstrack—subgradestructure，(2)Itsimulatesthehighmovingtrainloadbythreefunctionthroughanalyzingthemechanismproducingbytrain．Itoverviewssoil’Sdynamicstress-strainfeaturesandelastoplasticconstitutiverelation．(3)Itbrieflyintroducesthelarge-scaletestmodelofballastlesstrack

6、subgradeandthecomprehensivefieldtest．(4)Itestablishes3Dnumericalmodelofslabballastlesstrack-subgradestructurebysoftwareFLAC-3D，anddoesdynamicsimulationbyusingthenumericalmodel．Itanalyzestheinfluencefeatureofsubgradestructurallay’Sstiffnessandthicknesstothedynamicalresponseofslabballa

7、stlesstrack—subgradestructure；italsoanalyzestheinfluencefeatureofthedifferenttrainaxleandspeed．西南交通大学硕士研究生学位论文第T11页(5)Throughcomparingthecalculationresultswithmeasuredresults，thenumericalmodelandcalculationparametersaleprovedtobereasonable．Therefore，wecangraspthedynamicalcharacterist

8、icofballastl