Review of fundamental principles in modelling unsaturated soil behaviour

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1、ComputersandGeotechnics38(2011)757–776ContentslistsavailableatScienceDirectComputersandGeotechnicsjournalhomepage:www.elsevier.com/locate/compgeoReviewReviewoffundamentalprinciplesinmodellingunsaturatedsoilbehaviourDaichaoSheng⇑CentreforGeotechnicalandMaterialsModelling,School

2、ofEngineering,TheUniversityofNewcastle,NSW2308,AustraliaarticleinfoabstractArticlehistory:Anunsaturatedsoilisastateofthesoil.Allsoilscanbepartiallysaturatedwithwater.Therefore,consti-Received5February2011tutivemodelsforsoilsshouldideallyrepresentthesoilbehaviouroverentirerange

3、sofpossibleporeReceivedinrevisedform18April2011pressureandstressvaluesandallowarbitrarystressandhydraulicpathswithintheseranges.ThelastAccepted9May2011twodecadesorsohaveseensignificantadvancesinmodellingunsaturatedsoilbehaviour.Thispaperpresentsareviewofconstitutivemodelsforuns

4、aturatedsoils.Inparticular,itfocusesonthefundamentalprinciplesthatgovernthevolumechange,shearstrength,yieldstress,waterretentionandhydro-Keywords:mechanicalcoupling.Alternativeformsoftheseprinciplesarecriticallyexaminedintermsoftheirpre-Unsaturatedsoilsdictivecapacityforexperi

5、mentaldata,theconsistencybetweentheseprinciplesandthecontinuityConstitutivemodellingVolumechangebetweensaturatedandunsaturatedstates.ShearstrengthÓ2011ElsevierLtd.Allrightsreserved.YieldstressWaterretentionHydro-mechanicalcouplingContents1.Introduction.........................

6、................................................................................7572.Netstressandsuction.................................................................................................7583.Volumechangebehaviour..................................................

7、............................................7593.1.Separatestressandsuctionapproach...............................................................................7593.2.Combinedstress–suctionapproach..............................................................................

8、...7603.3.SFGapproach........................................