高速列车荷载作用下cfg桩复合地基动力特性分析与桩体疲劳寿命预测

《高速列车荷载作用下cfg桩复合地基动力特性分析与桩体疲劳寿命预测》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、西安建筑科技大学硕士学位论文mainlyvertical;thefasterincreasedpeakdynamicstressofpilesandsoilalongthelongitudinaldirectionsofthesubgradebyincreasingthespeeds,thefasteritdecays,andthenumberofthelinetrainsrunnsisrelatedtothelaw;soildynamicstressdecayfasterthanthepilealongdepthofthepile,thedistributionofpiledynamic

2、stressalongthelengthofthepiledepthpresentsmorecomplex;thedynamicstressattenuationofpileandsoilalongthepilelengthisnotobviouswithtrainspeed.4.Vibrationonthesiteofthetrainrunningmainlyinthescopeoftheembankment,butthevibrationcausedbythevenuesoutsidetheembankmentshouldalsobegivendueattention;asthedep

3、thincreases,thevibrationatcompositefoundationcausedbytrainsfocusedinthepilebody;theinfluencedepthofvibrationcausedbytheimpactofthetrainrunningincreasesbecauseofCFGpilesexist;5.Withincreasingheightofsubgrade,thepeakdynamicstressontopofthepilecontinuedtodecline,whichshowsalinearrelationbetweenthem;t

4、heincreaseintrainlines,dynamicstressgrowthrateofcompositefoundationpileisfasterthansoil;theheightofsubgradeincreaseswithinacertainrangeforcompositeFoundationwithreducedaccelerationeffectismoreobvious,butwiththeincreasingheightofsubgrade,thistrendofdecreasemaygraduallyslowdown;6.Thefatiguelifecalcu

5、latedwiththemethodofcombiningthecriticalsurfacewithenergyislargerthanusingthevalueoflocalstress-strainmethod;themethodofcombiningthecriticalsurfacewithenergyisspecificallyclearbydefiningthedamagevariableisapplicabletotheanalysisofconcretefatiguelifewithmultiaxialstate,andcangivethelocationoffatigu

6、efailure.Keywords:High-speedrailway,ABAQUS,CFGpilecompositefoundation,traindynamicloading,fatiguelifeFundproject:1.TheresearchprojectinShaanxiProvince.“Thecomprehensivestudyofgeotechnicalandgeo-environmentalinXi’anconstruction”Issuefour:thesuitabilityandevaluationmethodofvariouspile.Itemnumber:201

7、1KTZB.2.Shaanxicoinnovationprojectsprojects.SettlementofrailtransportoperationsinXi'anintelligentdeviceformonitoringandevaluationofresearchanddevelopment.Itemnumber:2013KTCQ.万方数据西安建筑科技大学硕士学位论文3.Studyonlong-termst