高速铁路引起的环境振动与隔振分析

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1、西南交通大学硕士研究生学位论文第1I页wm————iNl——————一—————_—_一一⋯_i皇曼皇曼曼量曼量曼皇皇曼曼曼皇曼量曼皇曼曼曼皇曼曼AbstractWitlltheincreaseofrailwayspeed，axleload，roadnetworkdensityandtrafficdensity,therailwaytransportationhasaggravatedthepollutiontotheenvironment．111epollutiontotheenvironmentduetothemodemrailwaytransportat

2、ionliesinrailwaynoiseandenvironmentvibrationtransmittedbyground．Duringtheoperationofthevehicle，thedynamicloadcausedbymovingaxleloadandtrackirregularityleadsthevehicleandtracks仃ucturetovibrate．111evibrationofthetrackstructuretransmittedfromtracktogroundgeneratesthevibrationwave．髓einf

3、luenceofthevibrationontheresidentsaroundtherailway,neighboringconstructions，undergroundutilitiesandpreciseinstrumentsCan’tbeignored．Thereforeitisverymeaningfulandofappliedvaluetoanalyzetheenvironmentvibrationcausedbylligh-speedrailwayaswellashowtoreducethevibration．Basedontheexistin

4、gresearch,thefiniteelementmethodWasappliedtoestablishthevehicle-track--subgradeverticalmodelandthetrack·-subgrade··groundtwo··dimensionalmodelfordynamicanalysisrespectively,thusanalyzingthevibrationperformanceofthedoubleblockballastlesstrackwiththevehicleatthespeedof250km／h、300km／ha

5、nd350km／h．neisolationtrenchandconcreteundergrounddiaphragmwallwereconsideredasthevibrationisolationmeasuresintheresearch．Theinfluenceoftheburialdepth，thicknessandsettingpositionofisolationtrenchandconcreteundergrounddiaphragmwallonthevibrationisolationeffectwereanalyzed．111eresultss

6、howthat：(1)with110measuresofvibrationisolationortheisolationtrenchorconcreteundergrounddiaphragmwall，thethesupracrustalvibrationhaslittlechangeevencallbeignoreswhenthespeedrangesfrom250km／hto350km／h．(2)Witllintherangeof50mfromthecenterlineofthetrack,thesupracrustalvibrationlimitexce

7、eds80dBaccordingtotheCityRegionalEnvironmentVibrationStandard．(3)Thesupracrustalvibrationdecreases谢tlltheincreasingdistancefromthecenterlineofthetrack．Thevibrationmagnitudethatislargerthan20Hzisdampingrapidly,whilethatoflowerthan20Hzisdampingslowly．(4)Theisolationtrenchhasaprominent

8、e仔．ectonthesupracru