Shear vane test - Wikipedia

The shear vane test is a method of measuring the undrained shear strength of a cohesive soil. The test is carried out with equipment consisting of a rod ... Shearvanetest FromWikipedia,thefreeencyclopedia Jumptonavigation Jumptosearch Symbolusedindrawings Diagramshowingtherodandvaneinsertedintothesoil USArmyCorpsofEngineerspersonnelcarryingoutashearvanetest Theshearvanetestisamethodofmeasuringtheundrainedshearstrengthofacohesivesoil.Thetestiscarriedoutwithequipmentconsistingofarodwithvanesmountedtoitthatisinsertedintothegroundandrotated.Agaugeonthetopoftherodmeasuresthetorquerequiredtocausefailureofthesoilandprovidesaconversiontoshearstrength.Theequipmenthasbeeninusesinceatleast1948.Theequipmenthasalsobeenusedsinceatleast1967toassesstheshearstrengthofpacksofsnowatriskofformingaslabavalanche. Equipmentused[edit] Theshearvaneconsistsofastraightrodwithfourvanesononeend,arrangedinacruciformpattern,andacombinedhandle/torquegauge.Therodisinsertedintothesoiltoadepthof500mmandrotatedatarateofbetween6and12degreesperminute.Oncethesoilfailsinshearthegaugeshowsthemaximumtorqueapplied.Thegaugeismarkedwithascalethatconvertsthetorqueintoashearstrength(measuredinkiloNewtonspersquaremetre).Therearetwoscalesforusewithtwodifferentsizesofvane–150-by-75-millimetre(5.9 in× 3.0 in)vanesareusedforsoilswithshearstrengthsupto50 kN/m2and100-by-50-millimetre(3.9 in× 2.0 in)vanesforstrongersoils.IntheUnitedKingdomthemethodologyisgovernedbyBritishStandard1377(Methodsoftestforsoilsforcivilengineeringpurposes).[1] Theshearvaneisasimpleandportablepieceofequipment.[2]Thetestissuitableforclaysoilsclassifiedassofttofirm.Byremouldingthesampleandretestinganindicationofthesensitivityoftheclaycanalsobefound.[1]Thetesthasalsobeenusedtomeasuretheshearstrengthofmortarmixes,whereithasbeenshowntocorrelatewiththeslumpvalue.[2]Theequipmenthasalsobeenusedsinceatleast1967toassesstheshearstrengthofpacksofsnowatriskofformingaslabavalanche.[3] Historyandresearch[edit] ThetestwaspioneeredbyLCarlsonandAWSkemptonin1948.Therehasbeensomedisputeoveritsaccuracysincethen.CarlsonandSkemptonbelievedthatitprovidedahighervaluethanthatindicatedbyunconfinedcompressivetestsandinfactagreedbetterwiththevaluesexpectedingeotechnicaltheory.However1973researchclaimedthatthetestactuallyprovidedanunder-estimateofshearstrengthcomparedtocompressivetestswhereagoodqualityofsampleisobtainable.Thediscrepancyhasbeenattributedtothedisturbanceofthesamplecausedbytheinsertionoftheshearvane.[1] References[edit] ^abcBell,F.G.(2013).FoundationEngineeringinDifficultGround.Elsevier.p. 243.ISBN 9781483102320.Retrieved27September2018. ^abAustin,SA;Robins,PJ;Goodier,CI."Workability,shearstrengthandbuildofwet-processsprayedmortars"(PDF).SpecialistTechniquesandMaterialsforConcreteConstruction[ProceedingsoftheInternationalCongressonCreatingwithConcrete,Dundee,Scotland,September1999]:317–329.Retrieved27September2018. ^Halsegger,M."DevelopmentofaRotationalShearVaneforuseinAvalancheSafetyWork(MastersThesis)"(PDF).DepartmentofMechanicalEngineeringUniversityofCanterbury.Retrieved27September2018. vteGeotechnicalengineeringOffshoregeotechnicalengineeringInvestigationandinstrumentationField(insitu) Coredrill Conepenetrationtest Geo-electricalsounding Permeabilitytest Loadtest Static Dynamic Statnamic Porepressuremeasurement Piezometer Well Ramsounding Rockcontroldrilling Rotary-pressuresounding Rotaryweightsounding Sampleseries Screwplatetest Deformationmonitoring Inclinometer Settlementrecordings 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