土工格柵處理路橋過渡段的模型試驗(yàn)研究.pdf

1、西南交通大學(xué)碩士學(xué)位論文土工格柵處理路橋過渡段的模型試驗(yàn)研究姓名：萬鵬申請學(xué)位級別：碩士專業(yè)：鐵路與鐵道工程指導(dǎo)教師：蔡英2001.3.1西南交通大學(xué)碩士研究生學(xué)位論文第l|頁AbstractSubgradedeformationplaysasignificantroleindesigninghigh—speedrailwayThedifferentialsettlementofbridgesubgradetransitionsecti

2、onisatypicalandsophisticatedproblemintherespectofsubgradedeformationInpractice，therearesomeempiricalmethodstocontroldifferentialsettlementButurlfortunatclytheoreticstudyhasbeengivenlessconsiderationEspeciallywithregardto

3、anewkindofreinforeedsollstructure。thestudvofbridgesubgradetransitionreinforeedbygeogridhasreceivedlittleattentionSothisthesisstudiestheinfluenceofgeogridtothedeformationcharacteristicofbridgesubgradetransitionsectionThis

4、thesisfirstlysummarizesthebasiccharacteristicofhighspeedrailwaysubgradeandtheapplicationofgeosyntheticonsubgradeengineeringAtthesametime，theharmnessandtheoriginofdifferentialsettlementarealsobeendescribedandseveraluseful

5、treatmentsbeencomparedSecondlythereinforcedmechanismofgeogridisanalyzedemphaticallyBasedontheoryanalysis，three—dimension10adingexperiments，whichcanreflectfieldconditions，wereperformedonlargespecimenswheregeogridandgradin

6、gcrushedstonearesimilartofieldconditionsAlsothesespecimenscBnembodYthedeformationcharacteristicandtheresponseofrealstructureunderstaticloadSWiththetheoryanalysisandexperimentresults，thethesisstudiesthemechanismforgeogrid

7、tochangethedeforillationcharacteristieofgradingcrushedstoneandtodecreasesettlementFinallycomputationalmodelandparametersforspecimensareputforwardThethesisindicatesthatdifferentia】settlementofb“dgesubgradesectioncanbewell

8、controlledbyusinggeogridReinforcedeffectofgeogriddependsonlayermembers，thedepth，thespacingofgeogridsandalsoonlateralpressureworkingonreinforeedsoilThemechanismforgeogridtoreducedifierentialsettlementliesinthattheshearstr

9、essesofgeogridsoilinterface，occurringunderaxialcompressivepressurechangethemagnitudeanddistributionofhorizontalnormalstressinreinforeedsoilThisthesisalsoDutsforwardPScurveofreinforeedgradingcrushedstoneidealizedbytwostra

10、ightlinesandthenbymeansofALGORafiniteelementmethodsoftware，calculatesthesettlementofreinforeedsoilcompoundofcompositemembranewhichstandSforgeogridTheresultsagreewimthemeasurementsandtheoryanalysiswellKeyworda：bridge—subg