一維應(yīng)力狀態(tài)下飽和黏土熱應(yīng)變響應(yīng)本構(gòu)研究（文ResearchonThermo-Visco-ElasticConstitutiveModelofSaturatedClayinOne-DimensionalStressStateInordertostudythethermaldeformationresponseofsaturatedclayunderone-dimensionalstressstate,athermo-visco-elasticconstitutivemodelisestablishedbasedonthermodynamicsandrheologyprinciples.Themodeltakesintoaccounttheeffectsoftemperature,porewaterpressure,andstressonthedeformationbehaviorofsaturatedclay.Themodelisthenverifiedthroughcomparisonwithlaboratorytestdata.Resultsdemonstratethattheproposedmodelcanaccuratelypredictthedeformationbehaviorofsaturatedclay.Keywords:Saturatedclay,thermo-visco-elastic,one-dimensionalstressstate,constitutivemodel.Saturatedclayiswidelyusedingeotechnicalengineeringincludingdams,embankments,andexcavationsupportstructures.However,temperaturechangesduringconstructionandoperationmayleadtoconsiderablethermaldeformationoftheclay.Thus,itisessentialtoinvestigatethethermaldeformationbehaviorofsaturatedclayinordertoensurethestabilityanddurabilityofthestructures.Theconstitutivemodelisafundamentaltoolforpredictingthedeformationbehaviorofclay.However,fewconstitutivemodelscanaccuratelydepictthethermo-visco-elasticbehaviorofsaturatedclay.Therefore,itisnecessarytoestablishanewconstitutivemodelthatcanaccuratelypredictthethermaldeformationbehaviorofsaturatedclay.Thermo-Visco-ElasticConstitutiveTheproposedconstitutivemodelcomprisestwoparts:thevisco-elasticconstitutivemodelandthethermalconstitutivemodel.Visco-ElasticConstitutiveThevisco-elasticmodelisdeterminedbytheKelvin-Voigtmodel,inwhichthestressrelaxationfunctionisdefinedas:σ(t)=E1ε(t)+E2ε(t-whereσ(t)isthestressattimet,ε(t)isthestrainattimet,ε(t-tε)isthestrainattimet-tε,E1istheinstantaneouselasticmodulus,andE2isthevisco-elasticmodulus.Thestrainrateisdefineddε/dt=λ(σ-σw)/(E1+whereλistheviscositycoefficient,σwistheporewaterpressure,andE1andE2aretheelasticandvisco-elasticmoduli,respectively.ThermalConstitutiveThethermalconstitutivemodelisbasedontheassumptionthatthetemperature-dependentdeformationbehaviorofclaycanbedescribedbyaArrhenius-typeequation:εt=αtexp(-whereεtisthethermalstrainattemperaturet,αtisthethermalactivationfactor,Eistheactivationenergy,Risthegasconstant,andTistheabsolutetemperature.Theporewaterpressureandtheeffectivestressareincorporatedinthethermalconstitutivemodel,suchas:εt=αtexp(-E/RT)/(1-wheregistheeffectivestresscoefficient,whichdescribesthestressdependenceofthethermaldeformationbehavior.ValidationoftheTheproposedmodelwasvalidatedwithlaboratorytests.Thetestswereperformedonsaturatedclaysamplesunderone-dimensionalstressstateanddifferenttemperatureconditions.Thelaboratorytestsincludedstress-straintests,constantstrainratetests,andconstanttemperaturetests.Themodelwascalibratedusingthetestdata.Resultsshowthattheproposedmodelcanaccuratelydescribethedeformationbehaviorofsaturatedclayunderone-dimensionalstressstateandtemperatureTheproposedthermo-visco-elasticconstitutivemodelisabletoaccuratelypredictthedeformationbehaviorofsaturatedclayunderone-dimensionalstressstateandtemperaturechange.Themodeltakesintoaccounttheeffectsoftemperature,porewaterpressure,andstressonthedeformationbehavioroftheclay.Itiscrucialforthedesignandconstructionofgeotechnicalstructuresthatinvolvesaturatedclay.Anewthermo-visco-elasticconstitutivemodelforsaturatedclayunderone-dimensionalstressstatehasbeenestablishedinthisstudy.Themodeltakesintoaccounttheeffectsoftemperature,porewaterpressure,andstressonthedeformationbehaviorofsaturatedclay.Themodelwasvalidatedwithlaboratorytests,andther