In Situ Vane Shear Test | Geoengineer.org

Vane shear testing is one of the most common in-situ methods for the estimation of the undrained shear strength of the soil. The photos shown in this page ... TheInternationalInformationCenterforGeotechnicalEngineersOurSponsorsAdvertisingAdvertisingGeomapLOGINREGISTERHomeEducationSiteCharacterization&In-situTesting(General)InSituVaneShearTest PileDynamics,Inc.'sSPTHammerEnergyMeasurementsWebinarbeginsonApr19th2022MoreCreateafreeaccountandviewcontentthatfitsyourspecificinterestsingeotechnicalengineeringLearnMoreRegisterInSituVaneShearTestSiteCharacterization&In-SituTesting(General)Contents[hideshow]DescriptionSelectedTopicsWebClassAssignmentsVanesheartestingisoneofthemostcommonin-situmethodsfortheestimationoftheundrainedshearstrengthofthesoil.ThephotosshowninthispagearetakenduringthesitecharacterizationofasiteintheBayAreaaspartofthe"AdvancedSoilMechanicsLaboratory"courseinstructedbyProfessorR.B.SeedandM.RiemerattheUniversityofCaliforniaatBerkeley.TheFigureclosebesideillustratesthevanesheartipusedinthetests.Thetiphasadiameterof7.5cmandaheightof11.2cm.Typicallytherationofheighttodiametershouldbe2.TheVaneisintroducedintotheboreholetothedepthwherethemeasurementoftheundrainedshearstrengthisrequired.Thenitisrotatedandthetorsionalforcerequiredtocauseshearingiscalculated.InthefollowingFigure,youcanseeamanualvaneshear.Thebladeisrotatedataspecifiedratethatshouldnotexceed0.1degreespersecond(practically1degreeevery10sec).TheamountofrotationisspecifiedinthegreenarrowwhereastheredarrowhasadevicethatmeasurestherequiredTorque.TheprocedureandtheequipmenttypicallyshouldfollowtheproceduressuggestedbytheASTMD2573-72.TheshearstrengthofthematerialiscalculatedfromtheTorquebydividingbyaconstantKwhichdependsonthedimensionsandtheshapeofthevane.MorecanbefoundinASTMD2573-72.Itmustbenotedthatwhenthestrengthisrequiredforslopestabilityissues,thestrengthsfactorproposedbyBjerrum(1972),whichaccountsforthedifferentmodeoffailure,disturbancefactorproposedbyBjerrum(1972),whichaccountsforthedifferentmodeoffailure,disturbanceandrateeffects.ThecorrelationofthecorrectionfactorasafunctionofthePlasticityIndex(PI).ItcanbeseenthatforaPlasticityIndexof50,whichistrueforYoungBayMud,μ=0.8.ItcanbeseenthatforaPlasticityIndexof50,whichistrueforYoungBayMud,μ=0.8.TheresultsofthecorrectedVaneShearStrengthmeasuredin-situareshowninthefollowingplot.Theplotisshearstrength(corrected)vstimeandthetestwasperformedinarateof1degreeper10sec.Youcanseeintheplotthepeakshearstrengthandtheresidual.Afterthecompletionofthetestthevanewasrotatedtwiceandthentheresidualstrengthwasmeasured.References:ASTMD2573-72,"StandardtestmethodforFieldvanesheartestincohesivesoil". CoursenotesduringtheCE270L"AdvancedSoilMechanicsLaboratory"instructedbyProfessorM.RiemerandR.B.Seed,attheGeoengineeringProgramoftheUniversityofCaliforniaatBerkeley. 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