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A constitutive model of frozen saline sandy soil based on energy dissipation theory

冻土本构

InternationalJournalofPlasticity78(2016)84e113

ContentslistsavailableatScienceDirect

InternationalJournalofPlasticity

journalhomepage:www.elsevie

A constitutive model of frozen saline sandy soil based on energy dissipation theory

http://doc.xuehai.net/locate/ijplas

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.

A constitutive model of frozen saline sandy soil based on energy dissipation theory

A constitutive model of frozen saline sandy soil based on energy dissipation theory

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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