土工三軸試驗(yàn)中端部接觸和端部約束影響研究.pdf

1、大連理工大學(xué)碩士學(xué)位論文土工三軸試驗(yàn)中端部接觸和端部約束影響研究姓名：李云龍申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：工程力學(xué)指導(dǎo)教師：邵龍?zhí)?0070601端部接觸和端部約束對(duì)三軸試驗(yàn)的影響分析TheFormatCriterionofMaster’SDegreePaperofDUTAbstractTdaxialtestisonoofthemostcommonsoiltestswhichbringsoutthesoilconstitutemodelpar

2、ametersthroughthemeasu“釉entofaxialstrain，radialstrainandvolumestrainHowever，triaxialtestisinevitablyinfluencedbyendcontactandendrestriction，henceitisofgreatsignificancetodeterminetheinfluenceoftheendproblemsfortheimprove

3、mentoftriaxialtestequipmentandunderstandingthesoilconstitutelawInthispaperthestainlesssteelcylinderwithhigherstrengthisusedinthecompressiontestontheUiaxialtestequipmentThetestloadingsystemdeformationisstandardizedandload

4、ingsystemmechanicspropertyisanalyzedquantitativelybasedonwhichthewholemeas蝴lentmethodisadjusted，andtheresultsisconsistentwiththatofthedigitallinagemeasurementTheresultshowsthattheloadingsystemdeformationlaststhroughoutth

5、eloadingprocess，anditisobviousintheearlierstage，anditalsoillustratesthereasonwhythewholemeasurementmethodanddigitalimagelocaldeformationnleasurementmethodaredifferent，andfurtherstatestherationalityofdi百talimagemeasuremen

6、LThetriaxialtestisnumericallysimulaledtoanalyzcspecimeninteriorstressfieldvariationandtheeffectonspecimendeformationduringtheloadingprocessTheDuncanChangmodelisdevelopedalongwiththeapplicationconditionbasedOlltheplatform

7、ofABAQUSItisapplicableIntheearlierstageforthesimulationtest，and啪accuratelydisplaytheinfluenceoftheminimalprinciplestress011specimenlocalstrengthButitcannotshowtheplasticdeformationandstresssoftening，anditdegeneratestoapp

8、roximateelasticmodelinthelatestagesotheresultisnotreasonableInordertoillustratethesoilmechanicspropertyduringdifferentloadingstage，theMohrCoulombelastoplasticmodelisemployedinlatestageThenumericalresultsshowthat，duetoend

9、coustrietion，“hardcore’’appearsatthetwoendsofthespecimen，whichhavegreaterstrengthandstiffnessthanthemiddlepartUnderthecompressionofthehardcol“e)themiddlepartwillfirstyield，andthendevelopsintoplasticbandzoneTheaxialdeform

10、ationincreasesgreatly，andthespecimenlookslikeadrumintheappearanceThestateoftheplasticzoneisrelatedtotheendcoustrietionandsoilmaterialparameterThedeformationobtainedatthelatestageisinagreementwiththatofreality，andcanratio