超固結黏土三維本構模型分叉理論分析與數(shù)值模擬.pdf

1、上海大學碩士學位論文超固結黏土三維本構模型分叉理論分析與數(shù)值模擬姓名：段博申請學位級別：碩士專業(yè)：巖土工程指導教師：孫德安20091201上海大學碩士學位論文ABSTRACTThephenomenonofstrainlocalizationexistswidelyinvariousgeotechnicalengineeringpractices，whichhasacloserelationwiththedamagetomaterials

2、andstructureinstabilityAccidentscommonlyhappenedinpracticalconstructionengineeringsuchasthecollapseoffoundationpits，mountainlandslidefoundationdestabilizationandSOforthhavethesamefailuremechanismthatsoilislocallydeformed

3、underthespecialexternalload，andgraduallyformsvisibleshearbandsalongwiththedevelopmentofstrainlocalizationultimatelyresultingininstabilityandfailureofstructuresThereforetheresearchwithregardtotheformationmechanismofthestr

4、ainlocalizationisofgreatlypracticalsignificancetothestabilityanalysisofpracticalengineeringAtpresentamongmanytheoreticalresearchesregardingthephenomenonofstrainlocalization，bifurcationtheoryisoneofthemostattractiveissues

5、inthefieldofgeotechnicalengineeringWithregardtothebifurcationtheorythefundamentalproblemconcerningthephenomenonofstrainlocalizationistheconditionfortheoccurrenceofbifurcationBifurcationstronglyreliesontheconstitutivefeat

6、ureofmaterials，andarationalconstitutivemodelingcouldnotonlybeableteflectthestressstrainpropertiesofmaterialstruthfullybutalsopreciselydescribetheprocessofformationanddevelopmentofthestrainlocalizationInthispaperbasedonth

7、eHvorslevenvelopebasedthreedimensionalelastoplasticconstitutivemodelforoverconsolidatedclayproposedbyYaoetal，anthree—dimensionalanalyticalsolutiontothebifurcationandtheexpressionoftheinclinationangleforshearbandcausedbys

8、trainlocalizationarededucedThereafterthesolutiontobifurcationofthemodelalongdifferentstresspathsisresolvedonthebasisofthethree_dimensionalanalyticalsolutionMeanwhiletheinfluenceofOCR(OVerconsolidationratio)ontheanalytica