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                              Unifiedhardeningconstitutivemodelconsideringtheinfluenceof
                                               temperatureonK coefficient
                                                                0
                                        KONGLingming,LIZiguang,ZHANGHaibing
                  (SchoolofCivilandTransportationEngineering,BeijingUniversityofCivilEngineeringandArchitecture,Beijing 102616,China)


                  Abstract:TheK 0 coefficientisanimportantgeotechnicalparameter.Investigatingitsinfluencingfactorsand
                  changelawisvitalfordetermininggroundstressstates.TheinfluenceoftemperatureontheK 0 coefficientwasin
                  vestigatedinthispaperusingexperimentalandtheoreticalmethods.Firstly,someconfinedcompressiontestsatdif
                  ferenttemperatureswereconductedonsaturatedmixturesamplesofstandardsandandbentonite.Thechangelawof
                  the K 0 coefficientwithtemperaturewasobtained,indicatingthattheK 0 coefficientofnormallyconsolidatedsoilsde
                  creasesbutthatofoverconsolidatedsoilsincreasesslightlyastemperatureincreases.Secondly ,aquantitativerela
                  tionshipbetweenthe K 0 coefficientandtheinclinationoftheelastoplasticyieldsurfacewasderived,whichwasthen
                  combinedwiththeresultsofthetemperature - controlledconfinedcompressiontest.Thus ,thevariationoftheincli
                  nationoftheyieldsurfacewithtemperaturewasobtained.Finally ,byintroducingtherelationshipbetweenthein
                  clinationofyieldsurfaceandtemperatureintothetheoreticalframeworkoftheunifiedhardeningconstitutivemodel,
                  anewelastoplasticconstitutivemodelforsaturatedclayeysoilsconsideringthetemperatureeffectontheK 0 coeffi
                  cientwasestablished ,whichcanwellsimulatevariouslaboratorymechanicaltests.
                  Keywords:clayeysoils;temperature;K 0 coefficient;constitutivemodel

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