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1、GeoFlorida2010:AdvancesinAnalysis,Modeling&Design(GSP199)©2010ASCE307ShearStrengthofUnsaturatedSoil-GeotextileInterfaces123CharbelN.Khoury,GeraldA.Miller,KianooshHatami1Ph.DCandidate,SchoolofCivilEngineeringandEnvironmentalScience,UniversityofOklahoma,202W.Boyd,Room334,Norman,OK73019;PH(4
2、05)3259244;FAX(405)325-4217;email:ckhoury@ou.edu.23Professor,AssistantProfessor,SchoolofCivilEngineeringandEnvironmentalScience,UniversityofOklahoma,202W.Boyd,Room334,Norman,OK73019;PH(405)3255911;FAX(405)325-4217;email:gamiller@ou.edu,andkianoosh@ou.edu.ABSTRACTGeotextilesarewidelyusedin
3、variousapplicationsincludingearthenstructures,whichareoftenbuiltinunsaturatedsoilconditions.Thedesignoftheseearthenstructuresisoftendominatedbytheshearstrengthoftheinterfacebetweensoilandreinforcement(i.e.geotextile)layers.However,theunsaturatedsoil-geotextileinterfaceinteractionsarenotco
4、mpletelyunderstood.Thispaperexaminestheshearingbehaviorofunsaturatedsoil-geotextileinterfaces.Directsheartestresultsareusedtodefinefailureenvelopesforunsaturatedsoilandsoil-goetextileinterfaces.Experimentalresultsrevealanonlinearrelationshipbetweenthesoil-geotextileinterfacestrengthandmat
5、ricsuction.Thepaperdemonstratesthatthisnon-linearfailureenvelopecanbemodeledusingtheSoilWaterCharacteristicCurve(SWCC)andsaturatedeffectivestress-strengthparameters.Thepaperalsocomparestheshearingbehaviorofunsaturatedsoilandunsaturatedsoil-geotextileinterfaces.INTRODUCTIONANDBACKGROUNDMec
6、hanicallystabilizedearth(MSE)wallsandreinforcedsoilslopes(RSS)areusedextensivelyintheUnitedStatesandworldwide.Thebehaviorofthesestructuresisoftendominatedbytheshearstrengthoftheinterfacebetweenreinforcementlayersandsoil.Sincethesestructuresarebuiltinunsaturatedsoilconditions,astabilityana
7、lysisbasedonthemechanicsofunsaturatedsoilswouldprovideapropercharacterizationoftheinterfacebehaviorandmoreaccurateperformancepredictions.Thus,experimentalobservationsofinterfacebehaviorplayacrucialroleinbetterunderstandingthisbehaviorandprovideresearchersvaluableinf
