土工數(shù)值方法分析加筋邊坡等土體穩(wěn)定問題的研究

1、一畋85DI)Dg]J⑧天率大薯碩士學位論文學科專業(yè)：巖土工程作者姓名：宋飛指導教師：I]N旺教授廣21上出t1T七止口占2004年12月ABSTRACTThesoilslopestabilityisaclassictopicofsoilmechanicsThelimitequilibriummethodisawidelyusedmethodinengineeringpracticeforstabilityanalysisandpeop

2、lehaveaccumulatedabundantandreliableexperiencesaboutitButthisstillneedstobeimprovedand如rtherstudiedWiththedevelopmentofournationalhighwayconstructionbuildingembankmentsonsoftsoilfoundationisusuallyencounteredPreloadingan

3、dgeogridreinforcementarefeasibleandeffectivemethodsforweakfoundation訂eatmentofembankmentsHoweverthereinforcementtheoryofthegeogridisnotveryclear111eresearchstilllagsbehindthedevelopmentofengineeringpracticewhichlimitsits

4、applicationInthispaperbyemployingtheprincipleofengineeringmechanicsandthetheoryoflimitequilibriumofsoil，ageneralmethodforslopestabilityreinforcedembankmentandbearingcapacityofthefoundationisprovided，whichtheequilibriumof

5、forcesandmoments，andtheyieldconditionsontheslidingplanewillbereachedAndiftheslidingsurfaceisalogarithmspiralcurvedsurface，allaccurateformulacanbeobtainedAfterthistheconceptofsoiIfailurewit量1inmeslidingplaneisgivenandcorr

6、espondingequationsareformulatedThecomputationofearthpressureonaretainingwallisdiscussedwiththehorizontalslicemethodandacombinationplaneofplanelogarithmspiralcurvedsurfaceBecausethelimitequilibriumtheorymakestIleasstnrlpt

7、ionthatstress—strainrelationshipofsoilisrigidorrigidplasticthedeformationofthesoilcannotbeobtainedTherefore，byemployingelastic—plasticfiniteelementmethod，ageogridreinforcedembankmentisanalyzedinthisPaDerMohrCoulombmodeli

8、susedtosimulatethesoil’sstressstrainbellavior‘a(chǎn)ndonedimensionelasticbarunittoimitatethegeogridAcontactinterfaceunitisintroducedtosimulatetheinteractionbetweenthesollandthereinforcementmaterial耵lemagnitudeofsettlementunev

9、ensettlementandstresslevelinthesoilmassarecomparedwithtwodifferentcasesThefirstcaseisthenaturnIfoundationwithoutreinforcementandtheotheristhereinforcedsoil、villlgeogrid。Andbycomparisonthemechanismandsignificanteriectsofg

10、eogridreinforcementarediscussedForexampleitcanreducetheunevensettlementoftheembankment，decreaseitsdeformationandincreaseitsstabilityTheinfluenceofthemodulusofreinforcementmaterialandthefrictionfactorofinterfaceonreinforc

11、ementeffectsisanalyzedInadditiontreatmentofsoftsoilfoundationbygeogridreinforcementandpilesisalsostudiedFurthermore，byemployingthePLAXISsoftwareincombinationwithBiot’sconsolidationtheorygeogridreinforeedandplasticboard，d

12、rainedfoundal[ionisanalyzed111eresultsshowthatthegeogridreinforcementcooperatedbyplasticdrainboardscanquickentheconsolidationrateofsoftsoilfoundation，increasetheshearingstrengthofsoftsoilTheresearchandcorrespondingconclu