竖向荷载作用下钻孔灌注长桩单桩承载变形特性研究

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1、西南交通大学硕士学位论文竖向荷载作用下钻孔灌注长桩单桩承载变形特性研究姓名：徐丽芬申请学位级别：硕士专业：岩土工程指导教师：马建林20081201西南交通大学硕士研究生学位论文第1I页AbstractTheadvantageofboredpileissimpleconstruction，smallimpactonenvironment，largebearingcapacityandSOon．Itisthemainfoundationofhigh—risebuildingsandbridges．Forexam

2、ple，thefoundationofbridge,onJing—Jindedicatedpassengerline’Strafficismostlymadeupofboredpilesandthebridgeslengthislongerthan80％ofthe1ine．Becauseofthecomplexity,uncertaintyandregionalityofrockandsoilsurroundingpile，nowthereisnoaccuratemethodtocalculatebeari

3、ngcapacityofsinglepile．Researchonpilefoundationtodayisactive，butingeneral，thetheoryisbehindthepractice．Soresearchonbearinganddeformationcharacteristicsisofgreatsignificance．ThisthesisisbasedontheStaticLoadTestingoffoundationpileOilJing—Jindedicatedpassenge

4、rline’StraffictestsectionDK93+650．Itresearchesonloadtransfercharacteristicsofsinglepileunderverticalloadingandanalyzethemainfactorsofsidefrictionresistanceofpile．Intheexistingcalculationmethodsofsinglepile‘Ssettlement，Loadtransferfunctionmethodhasclearconc

5、ept，simplecalculation，greatpracticability．Therefore，itismostwidelyused．Researchershavemadeavarietyofloadtransferfunctions．SatouTakesimethodwhosetransferfunctionisf一万andconstitutivemodelsiSelasticperfectly—plasticbehaviorcanbeusedtoanalyzedifferenttypesofpi

6、leandloadtransferofhomogeneoussoilandnonhomogeneoussoil．Butthereisstillsomemistakesinthederivationofformula，forexample，pileandsioi’Srelativedisplacementandpile’scompressionsettlementisconfused．Onthebasisofexistingtheoreticalresearch，thisthesismodifiesSatou

7、Takesimethod，considerssedimentanddeptheffectofsidefrictionresistanceandmakesreasonablecalculationmethodofload—settlementofpilefoundation．Atlast，Usinganexamplevalidatetheanalyticalsolutionsuggestedbythisthesis．Inaddition，mudskinofboredpilecharactershaveanim

8、pactonbearingcapacityforcommonlong／ultra-longboredpiles．Groutingonthesideofpileisaneffective西南交通大学硕士研究生学位论文第1

9、l页waytOincreasesidefrictionresistanceandreducetheimpactofmudskinofboredpile．Therefore，thisthesisre