土质路基无碴轨道基床动态特性的模型试验研究

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1、西南交通大学硕士学位论文土质路基无碴轨道基床动态特性的模型试验研究姓名：冯立臣申请学位级别：硕士专业：道路与铁道工程指导教师：蒋关鲁20070301西南交通大学硕士研究生学位论文第1页AbstractFollowedourcountryordinarytrainspeedisraisingintherecentyears，aswellastheforwarddevelopmentandtheconstructiontendencyofhigh—speedrailroad．Theroadconditionsand

2、thedrivingconditionswerechangingmoreandmoreimportanttoenhancethedrivingsecurityandthecomfort．Unballastedtrackstructurehasobtainedthewidespreadapplicationontheoverseashigh·speedrailroadconstructionbecauseofitsflatnessandthefewservicesaswellasthehil曲comprehens

3、iveeconomicefficiency．Becausethehi曲-speedrailroadconstructionjuststartedinourcountry，thereferencematerialandthedesignexperienceareveryfew，moreoverthedesigningofthesoilsubgradebedonthetmballastedtrackconstructionisattheblankcondition．Basedontheabovereason，the

4、essentialengineeringresearchonthedesigningofthesoilsubgradebedseemedtobeextremelyurgentandimportant．TheindoorgreatproportionsubgradebedmodeltestwasdoneinthisarticlebasedontheconstructionpracticeofunballastedtrackonsoilsubgradeofSui-YuRailwayLine．Thefilleroft

5、hesurfacelayerofsubgradebedisgradedbrokenstoneandthebottomlayerofsubgradebedisA、Bgroupfilling．Thismodeltestaltogetherisdividedthreegroups：Thethicknessofsurfacelayeris0．4meterandthethicknessofbottomlayeris1．8meterinthefirstgroup；Thethicknessofsurfacelayeris0．

6、3meterandthethicknessofbottomlayeris1．8meterinthesecondgroup；thethirdgroupisraintest．ThefillerofthesurfacelayerofsubgradebedisgradedbrokenstoneandthebottomlayerofsubgradebedisA、Bgroupfilling，allthepaddinghavebeentakenfromtheSui-YuRailwayLineexperimentsection

7、worksite．Themodellingprocessandtestconditionanddataprocessingwereintroducedindetail．Analyzedthechangingruleofthedynamicstress，deformation，accelerationandprogressivesettlementinthesubgradebedunderthetraindynamicloadfunction．Obtainedthedataofthedynamicperforma

8、nceofsoilsubgradesbedforUnballastedTrack,whichwillprovidethebasisforfurtherimprovingsubgradesbeddesign．Keywords：soilsubgrade：unbaUastedtrack：subgradebed：dynamicperformance：modeltest．西南交通大学硕士研究生学