大直徑樁豎向荷載作用下承載性能理論分析

1、南京工業(yè)大學(xué)碩士學(xué)位論文大直徑樁豎向荷載作用下承載性能理論分析姓名：賀嘉申請學(xué)位級別：碩士專業(yè)：巖土工程指導(dǎo)教師：陳國興20060501IIABSTRACTAlongwiththeeconomicrapiddevelopmentofourcountrytheappearanceofmoderatehighhighbuildingslargespanbridgesmaketheuseoflargediameterpilefoundatio

2、nwhichhastheadvantageofhighbearingcapacitypopular.Buttheloadtransfermechanismofthistypeofpileisnotdistinct.Bynowthereisnomethodwhichagreewithpracticalsituation.Thedesignmethodoflargediameterpileintheapplicablecodesstards

3、cannotreflectthemechanismofloadbearingdefmation.Therefethestudyontheloadbearingpropertiesofthelargediameterpileisimptanttomeettherequirementsofthetheythereality.Atfirstthemethodswhichhavebeenusedtodecidethebearingcapacit

4、yoflargediameterpiletheirrespectiveadvantagesdisadvantagesaresummarizedthebearingbehavioflargediameterpileloadtransfermechanismofsinglepilearediscussedinthispaper.Inthenextplacefthethreedimensionfiniteelementcalculationo

5、fthesinglelargediameterpileundertheverticalloaditcanbesimplifiedtotheaxisymmetricproblems.Thequarterofthepilehasbeenchosentoanalyze.Theelasticconstitutivemodeltheelastoplasticconstitutivemodelshavebeenadoptedtosimulateth

6、epilesoilsrespectively.ithasbeenadoptedthemasterslavecontactsurfacemodelwhensimulatingthecontactbehavibetweenthepilesoils.ThereintotoassuretheshapeoftheextendedDruckerPrageryieldsurfaceconvexwhenitapproachedtotheMohrCoul

7、ombyieldsurfacethefrictionangleofsoilsislessthanequalto22degreeiftheextendedconstitutivemodelhasbeenadoptedasthesoilmodel.Ifthefrictionangleofsoilsismethan22degreeitcanadopttheMohrCoulombmodelasthesoilmodel.Theanalysisof

8、theseexamplesdemonstratethatthemethodhasbeenprovedtobeeffectivewhendeterminingthecapacityoflargediameterpile.Thirdlythelargediameterpileloadbearingpropertiesinisotropicsoilslayeredsoilrockaresimulatedbytheaxisymmetricfin

9、iteelementmethod.Theloadsettlementrelationshipcurvetheexertionofthelateralfrictionresistancethetransferoftheaxialfcethechangeofthedisplacementofpileareanalyzedinthisthreesituations.Meanwhileithasdiscussedthefactswhichcan