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1、ColdRegionsScienceandTechnology60(2010)154–160ContentslistsavailableatScienceDirectColdRegionsScienceandTechnologyjournalhomepage:www.elsevier.com/locate/coldregionsThestrengthcriterionandelastoplasticconstitutivemodeloffrozensoilunderhighconfiningpressuresYuguiYang,
2、YuanmingLai⁎,YuanhongDong,ShuangyangLiStateKeyLaboratoryofFrozenSoilEngineering,ColdandAridRegionsEnvironmentalandEngineeringResearchInstitute,ChineseAcademyofSciences,Lanzhou,730000,ChinaarticleinfoabstractArticlehistory:Aseriesoftriaxialcompressivetestsoffrozensoi
3、lhasbeenconductedatatemperatureof−6°CunderhighReceived6July2009confiningpressures.TheresultsverifythatthestrengthoffrozensoilincreasestoapeakvaluewithincreasingAccepted8September2009confiningpressure,butwithafurtherincreaseinconfiningpressure,thestrengthdecreasesforcru
4、shingandpressuremeltingphenomenaunderhighconfiningpressures.InordertomeettheneedsoftheengineeringKeywords:activitiesinundergroundworks,wherethefrozensoilisunderhighconfiningpressures,anewfailurecriterionisFailurecriterionproposedbasedontheexperimentalresults.Toanalyze
5、thedeformationoffrozensoilunderhighconfiningFrozensoilHighconfiningpressurespressures,anelastoplasticconstitutivemodelhastobeestablished.Inthisstudy,theyieldconditionisproposedConstitutivemodelbyemployinganellipticalyieldsurface.Theplasticpotentialsurfacedependsonthes
6、amearguments,butanonassociatedflowruleisused.Allparametersofthemodelareidentifiedbytests.Thevalidityofthemodelisverifiedbycomparingitsmodelingresultswiththecorrespondingexperimentalresults.©2009ElsevierB.V.Allrightsreserved.1.Introductionwithincreasinghydrostaticconfini
7、ngpressuretoabout34MPa,thendecreasedwithfurtherincreaseinpressureandthemaximumvalueWiththewideuseoftheartificialgroundfreezingmethodtowas19.7MPaataconfiningpressureof34MPa.Theyconsideredthatmetroengineering,tunnelsandotherengineeringactivitiesintheinitialincreaseinstr
8、engthwithincreaseinhydrostaticconfiningundergroundworks,thestabilityoffrozensoilengineeringunderpressurecouldbeduetotheclosureofvoidsandmic
