Vane Shear Test: Apparatus and Procedure | Soil Engineering

Vane Shear Test: Apparatus and Procedure | Soil Engineering · 1. The specimen in the mold should be at least 30 mm in diameter and 75 mm long. · 2. If the ... BusinessManagementIdeas Home Home AboutUs ContentQualityGuidelines Upload&Share Disclaimer PrivacyPolicy TermsofService ContactUs ReportSpellingandGrammaticalErrors SuggestUs UsersTestimonials ProhibitedContent Copyrightinfringementtakedownnotificationtemplate ImageGuidelines ContentFiltration UploaderAgreement AccountDisabled PlagiarismPrevention Home Copyright ThankYou HowtoReportAPolicyViolation Home2 ReturntoContent Articlesharedby: ADVERTISEMENTS: Inthisarticlewewilldiscussabout:-1.ApparatusforVaneShearTest2.ProcedureforVaneShearTest3.Observations4.Calculations5.FieldVaneShearTest. Apparatus forVaneShearTest: Atypicalvaneshearapparatusconsistsofthefollowingcomponents: 1.Vane-Thevaneconsistsoffourbladeseachfixedat90°totheadjacentblades.Thevaneformsacircleofdiameter10mmwhenrotatedaboutthecentralaxis.Theheightofthevanesis24mm. ADVERTISEMENTS: 2.Thevanebladesareweldedtoacentralrod,ofdiameter2.5mm. 3.Arrangementforloweringthevaneintothesoilspecimengraduallyandvertically. 4.Arrangementforrotatingthevanesteadilyatarateofapproximately6°perminute(0.1°pers)andformeasur­ingtherotationofthevane. 5.Atorqueapplicatortorotatethevaneinthesoilandadeviceformeasuringthetorqueappliedtoanaccuracyof0.05kgf.cm ADVERTISEMENTS: 6.Asetofspringscapableofmeasuringshearstrengthof0.5kgf/cm2. 7.Acylindricalmoldinwhichthesoilspecimenisplaced. Procedure forVaneShearTest: 1.Thespecimeninthemoldshouldbeatleast30mmindiameterand75mmlong.Mountthespecimencontainerwithspecimenonthebaseofthevaneshearapparatusandfixitsecurelytothebase. 2.Ifthespecimencontainerisclosedatoneend,itshouldbeprovidedatthebottomwithaholeofabout1mmdiameter.Lowerthevanesintothespecimentotheirfulllengthgraduallywithminimumdisturbancetothesoilspecimensothatthetopofthevaneisatleast10mmbelowthetopofthespecimen.Notethereadingsofthestrainandtorqueindicators.Switchonthemotorandallowthevanetorotateatauniformrateapproximately0.1°persecond(6°perminute)untilthespecimenfails. ADVERTISEMENTS: 3.Notethefinalreadingofthetorqueindicator.Torquereadingsandthecorrespondingstrainreadingsmayalsobenotedatdesiredintervalsoftimeasthetestproceeds. ObservationsRecordedduringVaneShearTest: Followingobservationsarerecordedduringthetest: 1.Diameterofthevane,D(mm). 2.Heightofthevane,H(mm). ADVERTISEMENTS: 3.Watercontentofthesoilspecimen,ω(%). 4.Bulkdensityofsoilspecimen,γ(kN/m3). 5.Drydensityofsoilspecimen,γ(kN/m3). 6.Initialdialreading,D1(degrees). ADVERTISEMENTS: 7.Finaldialreading,D2(degrees). 8.Springconstant,k(kgf.cm). Calculations madeinVaneShearTest: 1.CalculatetheTorqueappliedusing– whereTisthetorqueatfailure,D2isthefinaldialreadingandD1istheinitialdialreading. 2.Calculatetheshearstrengthofthesoilusing– whereTisthetorqueatfailure,Dtheoverallwidthordiameterofthevane,andHistheheightofthevane.Hereτuistheshearstrengthinkgf/cmandTthetorqueinkgf.cm. Note: Equation(13.52)isbasedonthefollowingassumptions: 1.Shearingstrengthsinthehorizontalandverticaldirectionsarethesame. 2.Atthepeakvalue,shearstrengthisequallymobilizedattheendsurfaceaswellasatthecentre. 3.Theshearsurfaceiscylindricalandhasadiameterequaltothediameterofthevane. FieldVaneShearTest: Thevanesheartestismorecommonlyconductedinthefieldtodeterminetheinsituundrainedshearstrengthofsoftclays.Thefieldvaneis5-10cmindiameterand10-20cminheight.Toconductthetest,thevaneisfixedtothedrillrodoftheboringequipmentinthefieldandloweredintotheboreholetotherequiredleveltodeterminetheinsitustrength.Thevaneispushedverticallydownintothesoilandthenatorque(T)isappliedtotherodtocauseshearfailureofthesoiloverthesurfaceandends.Theundrainedshearstrengthisobtainedfromtheexpression– whereTisthetorqueatfailure;Dtheoverallwidthofthevane;Htheheightofthevane;anda=2/3foruniformendshear,2/5forparabolicendshear,and1/2fortriangularendshear. Theremoldedshearstrengthmaybedeterminedafterremoldingthesoilbyrotatingthevaneseveralrevolu­tions.Fromtheundisturbedandremoldedshearstrength,thesensitivityofthesoilcanbedetermined. Home››SoilEngineering››SheerStrength››Determination››Tests››VaneShearTest ReletedArticles: HowtoDeterminetheShearStrengthofSoil?|SoilEngineering SoilEngineering,SheerStrength,Determination,Tests,VaneShearTest DirectShearTest:ApparatusandProcedure|ShearStrength|SoilEngineering ShearFailureofSoil:3Modes|SoilEngineering Commentsareclosed. StartUploadingYourArticlesNow. 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