列车荷载作用下无砟轨道路基动应力特性分析.pdf

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1、第35卷第9期铁道学报Vo1．35NO．92013年9月】0URNALOFTHECHINARAIIWAYS0CIETYSeptember2013文章编号：1001—8360(2013)090086—08列车荷载作用下无砟轨道路基动应力特性分析刘钢，罗强，张良，陈虎，陈坚(西南交通大学高速铁路线路工程教育部重点实验室，四川I成都610031)摘要：以现场实测数据为基础，结合理论分析与有限元计算，对列车荷载通过无砟轨道传递到路基面的动应力分布模式及频响特征、动应力沿路基深度的衰减规律等进行讨论，可得出以下结论：(1)无砟轨道具有良好的荷载扩散作用，路基面动应力的

2、一次加卸载过程由1个转向架的2个轴载共同作用完成，并可简化为纵向梯形、横向均匀的分布模式；(2)双轴转向架荷载作用下的动应力沿深度衰减较慢，至基床底部的衰减率约为5o％，较实测值偏大约1O；(3)路基面承受的动应力作用频率由列车荷载激振引起，主要受车长及转向架间距控制，转向架轴距对应的频响特征已不明显，最大作用频率约为车长频率的4倍。关键词：无砟轨道；路基；列车荷载；动应力；频响特征中图分类号：U213．1文献标志码：Adoi：10．3969／j．issn．1001-8360．2013．09．014AnalysisontheDynamicStressChar

3、acteristicsoftheUnballstedTrackSubgradeunderTrainLoadinglIUGang，LUOQiang，ZHANGIiang，CHENHu，CHENJian(MOEKeyLaboratoryofHigh—speedRailwayEngineering，SouthwestJiaotongUniversity，Chengdu610031，China)Abstract：Takingdatameasuredonsiteasthebasisandcombiningwiththeoreticalanalysisandfinite

4、elementcalculation，referringtothesituationwhenloadsofarunningtrainweretransmittedfromunballastedtrackstosubgradesurface，thedistributionpatternandfrequencyresponsecharacteristicsofdynamicstressesandtheat—tenuationlawofdynamicstressesalongthesubgradedepthwereinvestigated．Thefollowing

5、conclusionsaredrawn：(1)Becauseunballastedtrackspossessgoodloaddiffusioneffect，oneloadingandunloadingcycleofdy—namicstressesonsubgradesurfaceiscompletedbyCO—actionoftwoaxleloadingofonebogie，anditissimpli—fiedintodistributionoftrapezoidsinthelongitudinaldirectionanduniformdistributio

6、ninthelateraldirection；(2)dynamicstressesattenuateslowlyalongthesubgradedepthundertwo—axleloading，andtheirattenuationrateiSdecreasedto50atthebottomoffoundation，about10morethanthemeasuredvalue；(3)thefre—quenciesofdynamicstressesactingonsubgradesurfaceareexcitedbytrainloadsandaremain

7、lycontrolledbyvehiclelengthsandbogieintervals，thefrequencyresponsecharacteristicscorrespondingtOthebogiepitcharegone，andthemaximumactingfrequencyis4timesthefundamentalfrequencygeneratedbythevehiclelength．Keywords：unballastedtrack；subgrade；trainload；dynamicstress；characteristicsoffr

8、equencyresponse无砟轨道用强度高、刚度