成灌快铁路堤区段环境振动特性分析

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1、万方数据西南交通大学硕士研究生学位论文第1I页AbstractCurrently,high—speedrailwayhasbecomethemaintransportation．Asakindoftransportationwiththefastspeed，timeaccurate，safe，comfortable，itiswelladaptedtotheneedofmodemsocialandeconomicdevelopment．Therapiddevelopmentofhigh-speedrailwayhasbroughtenvironmentalproblemswhichbeignor

2、edanymore，especiallytheenvironmentalvibrationproblemwhichcausedbyhigh-speedtrains．Thegroundvibrationcausedbythehi曲speedrailtrainismainlyintheembankmentsectionandbridgesectionWhenitamplitudesatthesamedistancefromtherailway,thevibrationfromembankmentsectionislargerthanbridgesection．Sostudyingthecharac

3、teristicofembankmentvibrationhasgreatsignificance．Basedontheexistedstudiesofdomesticandinternationalrailtransportationsystemvibration，thisthesiscombinedthefieldtestdataofvibrationinducedbytheCheng--guanhigh--speedrailwayandanalyzethegroundvibrationcharacteristicsofCheng·-guanhigh-·speedrailwayembank

4、mentsectionThispapermeasuredthevibrationdataofCheng—guanK24+280embankment，thensummarizedthecharacteristicsofembankmentgroundvibrationresponsebyanalyzingthetime—accelerationcurveandspectrum—accelerationcurve，andcalculatingthepeakfactorofvibration．ThisthesisfittedtheZvibrationleveldatatoobtainempirica

5、lformulaofenvironmentalvibrationattenuation．Throughthisresearch，there’Stheconclusions：thegroundvibrationscausedbytrainsattenuatedwiththeincreasingdistanceoverall．Themeasuringpointsclosetovibrationsourcedecayfaster．Somedistanceoccurredthevibrationamplificationphenomenon．Byanalyzingcrestfactorofmeasur

6、ingpoint，wefoundthatitwasgenerallyeffectivetoevaluatethetrainvibrationoftheCheng—guanlinebythebasicevaluationmethod，there’Snoneedtouseotherevaluationmethods．Themeasuringpointsclosedtovibrationsourcearemainlyaffectedbyhighfrequencyvibration．Withtheincreaseofthevibrationtransmissiondistance，theimpacto

7、fthehighfrequencyvibrationonthemeasuringpointdecreases．Themainfrequencynearthevibrationsourceistheinherentvibrationfrequencyinducedbypassedtrains．Whenthedistanceexceedsacertainlimit，thetraininherentvi