冻土本构
InternationalJournalofPlasticity78(2016)84e113
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InternationalJournalofPlasticity
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Aconstitutivemodeloffrozensalinesandysoilbasedonenergydissipationtheory
YuanmingLaia,b,*,MengkeLiaoa,c,KaiHua
a
StateKeyLaboratoryFrozenSoilEngineering,ColdandAridRegionEnvironmentalandEngineeringInstitute,ChineseAcademyofSciences,Lanzhou,Gansu730000,Chinab
SchoolofCivilEngineering,LanzhouJiaotongUniversity,Lanzhou,Gansu730070,Chinac
UniversityofChineseAcademyofSciences,Beijing,100049,China
articleinfo
Articlehistory:
Received3February2015
Receivedinrevisedform10October2015Availableonline2November2015Keywords:B:Anisotropy
B:MechanicalpropertiesB:PlasticdeformationB:ThermomechanicalFrozensalinesoil
abstract
AseriesoftriaxialcompressiontestsarecarriedoutforfrozensalinesandysoilwithNa2SO4contents0.0,0.5,1.5,and2.5%undercon ningpressuresfrom0MPato16MPaatÀ6 C,respectively.Thetestresultsindicatethat,theCriticalStateLine(CSL)offrozensalinesandysoiliscurveandisnotthroughtheoriginin(p,q)plane,andthesoilparticleshavethepropertiesofinitialanisotropicrotationalangleandloadedanisotropyinprocessofloading.Inordertodescribethedeformationpropertiesoffrozensalinesandysoil,anewdoubleyieldsurfaceconstitutivemodelisproposedbasedonthetriaxialcompressiontestsinthispaper.Theproposedmodelcontainsthein uenceofsaltcontentsonme-chanicalcharacteristics,soitissuitablefordescribingthestressestrainrelationoffrozensalinesoil.Theproposedmodelhasthefollowingproperties:(1)Byde ningamodi edeffectivestressp*,acriticalstatestrengthenvelopefunctionisestablishedaccordingtotheModi edCamClaymodel.Theenvelopeapproximatesastraightlineunderlowcon ningpressures,butitiscurvedownwardunderhighcon ningpressuresduetopressuremelting.(2)Theeffectoftheinitialanisotropicrotationalangleandloadedanisotropy,duringprocessofloadingunderplasticvolumetriccompressionmechanism,onyieldsurfaceofrotationalhardeningistakenintoaccount.(3)Aparaboloidyieldsurfacefunction,includingtherotationalhardeninglawinducedbyloading,isproposedunderplasticshearmechanism.Theuniversalityoftheproposedmodelisveri edbythetestresultsoffrozensalinesandysoilunderdifferentstresspaths.Finally,inordertofurtherstudytheapplicabilityoftheproposedmodelinthispaper,thestressestrainrelationofthecementedclayissimulatedbyit.Andthein uencesofthepressuremeltingphe-nomenonandtherotationalhardeningruleonthecalculatedresultsoftheproposedmodelareinvestigated.TheresearchresultsindicatethattheproposedmodelcansimulatenotonlythemechanicspropertiesofmaterialswhoseCSLisstraightbutalsothoseofmaterialswhoseCSLiscurved,otherthanpredictthedeformationregularityoffrozensalinesandysoilwell.
©2015TheAuthors.PublishedbyElsevierLtd.ThisisanopenaccessarticleundertheCC
BY-NC-NDlicense(http://doc.xuehai.net/licenses/by-nc-nd/4.0/).
*Correspondingauthor.StateKeyLaboratoryFrozenSoilEngineering,ColdandAridRegionEnvironmentalandEngineeringInstitute,ChineseAcademyofSciences,Lanzhou,Gansu730000,China.Tel.:þ869314967288.
E-mailaddress:ymlai@http://doc.xuehai.net(Y.
Lai).http://doc.xuehai.net/10.1016/j.ijplas.2015.10.008
0749-6419/©2015TheAuthors.PublishedbyElsevierLtd.ThisisanopenaccessarticleundertheCCBY-NC-NDlicense(http://doc.xuehai.net/licenses/by-nc-nd/4.0/).
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