上海粘性土平面應(yīng)變試驗(yàn)剪切帶形成的數(shù)值模擬研究.pdf

1、同濟(jì)大學(xué)碩士學(xué)位論文上海粘性土平面應(yīng)變試驗(yàn)剪切帶形成的數(shù)值模擬研究姓名：徐建明申請學(xué)位級(jí)別：碩士專業(yè)：巖土工程指導(dǎo)教師：董建國2003.3.1旦墮查蘭皇墮墮主蘭些堡奎一一一一一!!里ABSTRACTAtypicalphenomenonoffailureaboutgeotechnicalmaterialsisthattheformationofshearbands，whichcanbethoughtasthebifurcationphen

2、omenonofgcotechnicalmaterialsExperimentalinvestigationsindicatethat，shearbandsviiialwaysbeobservedduringplainstraincompressiontest，whicharcsimilartothebifurcationphenomenaAseriesofconsolidatedundrainedplanestraincompress

3、iontestsofShanghaiintactclayweremade，mostlyoflayer2，yellow—darksiltyclayDuringthecourseofshearing，thestressstrainresponseincludingpostfailurestrainsofteningandtheevolutionoflocallateralnon—homogeneousdeformationinthesamp

4、leswererecorded，andtheprocessofshearbandsformationwasobservedOnthebasisofbifurcationtheory’theobliquityofshearbandswascalculated，andreachestheconclusionthattheobliquityofshearbandsisclosetothetheoreticvalueofMohr—ColumbT

5、heoryOnthebasisofthecamclaymodel，workouttherate如rmationandthematrixofstressstrainrelationDeterminetheusedparameterinthemodelThenonthebasisofplainstrainanalysisofshearbandsbyFEM，thestressstraincurveofplainstraintests，thes

6、tartingofdetbrmationlocalization，thelocalizationofstabilitythepatternofshearbandsandtheevolutionofsoilsampleweremodeledundertheinfluenceofweakelements’position，confiningpressure，rateofloadingandsizeeffectKeywords：plainst