胶济客运专线水泥土搅拌桩复合地基承载特性研究

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1、西南交通大学硕士学位论文胶济客运专线水泥土搅拌桩复合地基承载特性研究姓名：俞伟申请学位级别：硕士专业：岩土工程指导教师：邓荣贵20090501西南交通大学硕士研究生学位论文第1I页Asthenationaleconomyincreases，theprojectofconstructionmakesrapidprogress．Inordertomeetthedemandofgroundsillintension,deformationandanti．seismicetc，thecrudesoftsoilmustbedearwithartificially．Composit

2、efoundationwithcementmixingpilesiswidelyusedinvariesprojectsduetoitsremarkableeconomicalbenefits，convenientconstructionandnocircumstancepollution．However,thehistoryofcementmixingpilesreinforcementtechniqueisonlyabouttensyears．Notonlymechanismsofreinforcementbutalsodesignandcomputingmetho

3、dshavesomefaultiness．Somearestillindiscussion．Basedonthecementmixingpiles’fieldtestresultsatQingzhouStraightenedSection(DKK225+950～DKK238+890)ofJinan—QingdaoDedicatedLine，thispaperfocusesonthequestionsasfollowings：(1)Thecementmixingpilecompositefoundation'sbearingcapacityanddeformationbe

4、haviorarestudiedbythefieldtestandtheoreticanalysis．Thebearingcapacityaswellastheelasticmodulusofeachpileandcompositefoundationisobtainedbyfieldtestsonoriginalsoil，thesoilbetweenpiles，singlepileandone-pilecompositefoundation．Theresultsshowthattheloessialsiltyclayreinforcedbycement-soilpil

5、eshasbetterperformanceinbearingcapacityanddeformation．Thestrengthandelasticmodulusofsoilareobviouslyimproved．(2)Numericalmodelissetup．Themodeloftheinteractionbetweenpilesandsoilisbuiltbased011theinteractionbetweenpilesandsoil．Numericalsimulationsarecarriedoutonthebearingperformancesofthe

6、cementmixingpilecompositefoundation，onepilegroupand4×4pilesgroup，respectively,byusingthefinitesoftwarecalledFLAC3D．Then，byanalyzingtheinfluencesofsuchfactorsasload，cushionmodulus，cushionthickness，theratiooflength--radiusofthepile，themodulusofpileandthereplacementratioonthesettlementofcom

7、poundfoundationandthestress西南交通大学硕士研究生学位论文第1II页ratiobetweenpileandsoil，itisfoundthattherehavethebestmodulusofpile，thebestratiooflength-radiusofthepileandthebestreplacementratio．Basedonthecomparisonbetweentheresultsofcomputinganalysisandtheexperiment,itisdemonstratedthatth