Shear Strength of Soil by Vane Shear Test - The Constructor

Test procedure of vane shear test contains following steps: ... Lower the vane gradually into the soil specimen until the top of vane is at a ... Join JoinTheConstructortoaskquestions,answerquestions,writearticles,andconnectwithotherpeople.Whenyoujoinyougetadditionalbenefits. 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Search AskAQuestion Mobilemenu Close AskaQuestion ShearStrengthofSoilbyVaneShearTest Home/ GeotechnicalEngineering/ GELabTests/ShearStrengthofSoilbyVaneShearTest Doyouneedtoremovetheads?Joinnow! 🕑Readingtime:1minuteVanesheartestisusedtodeterminetheundrainedshearstrengthofsoilsespeciallysoftclays.Thistestcanbedoneinlaboratoryorinthefielddirectlyontheground.Vanesheartestgivesaccurateresultsforsoilsoflowshearstrength(lessthan0.3kg/cm2). Contents:ShearStrengthofSoilbyVaneShearTestApparatusProcedureofVaneShearTestObservationsandCalculationsofVaneShearTestResultofVaneShearTestAdvantagesofVaneShearTestDrawbacksofVaneShearTest ShearStrengthofSoilbyVaneShearTest Apparatus Apparatusrequiredforvanesheartestare: Vaneshearapparatus Soilspecimencontainer Verniercallipers Fig1:VaneShearApparatus Vaneshearapparatusconsistshightensilesteelrodtowhichfoursteelblades(vanes)arefixedatrightanglestoeachotheratthebottomofrod. Fig2:SteelRodwithVanes AlsoRead: ShearingStrengthofSoilsanditsTests ProcedureofVaneShearTest Testprocedureofvanesheartestcontainsfollowingsteps: Cleanthevaneshearapparatusandapplygreasetotheleadscrewforbettermovementofhandles. Takethesoilspecimenincontainerwhichisgenerally75mminheightand37.5mmindiameter. Levelthesoilsurfaceonthetopandmountthecontaineronthebaseofvanesheartestapparatususingscrewsprovided. Lowerthevanegraduallyintothesoilspecimenuntilthetopofvaneisatadepthof10to20mmbelowthetopofsoilspecimen. Fig3:LoweringVaneintotheSoilSpecimen Notedownthereadingofpointeroncirculargraduatedscalewhichisinitialreading. Rotatethevaneinsidethesoilspecimenusingtorqueapplyinghandleatarateof0.1opersecond. Whenthespecimenfails,thestrainindicatorpointerwillmovebackwardsonthecirculargraduatedscaleandatthispointstopthetestandnotedownthefinalreadingofpointer. ThedifferencebetweenInitialandfinalreadingsisnothingbuttheangleoftorque. Repeattheprocedureontwomoresoilspecimensandcalculatetheaverageshearstrengthvalue. MeasurethediameterandheightofvaneusingVerniercallipers. Sensitivityofgivensoilsampleisdeterminedbyrepeatingtheabovetestprocedureonremoldedsoilwhichisnothingbutsoilobtainedafterrapidstirringofvaneintheabovetest. Sensitivityofsoil=undisturbedshearstrength/remoldedshearstrength. ObservationsandCalculationsofVaneShearTest Shearstrengthofgivensoilsampleiscalculatedfrombelowobservations. Diameterofvane,D=___cm Heightofvane,H=____cm Torque,T=(Springconstant/180)*(initialreading-finalreading) Shearstrengthofsoil(S)iscalculatedfrombelowformula. S.No InitialReading FinalReading (InitialReading–finalreading) Torque(T) Shearstrength(S) 1 2 3 ResultofVaneShearTest Shearstrengthofsoilspecimen=________kg/cm2. AdvantagesofVaneShearTest Advantagesofvanesheartestareasfollows: Vanesheartestiseasyandquick. Thistestcanbeperformedeitherinlaboratoryorinthefielddirectlyontheground. In-situvanesheartestidealforthedeterminationofundrainedshearstrengthofnon-fissured,fullysaturatedclay. Shearstrengthofsoftclaysatgreaterdepthscanalsobefoundbyvanesheartest. Sensitivityofsoilcanalsobedeterminedusingvanesheartestresultsofundisturbedandremoldedsoilsamples. DrawbacksofVaneShearTest Drawbacksofvanesheartestareasfollows: Vanesheartestisnotsuitableforclayswhichcontainsandorsiltlaminationsinit. Itcannotbeconductedonthefissuredclay. Ifthefailureenvelopeisnothorizontal,vanesheartestdoesnotgiveaccurateresults. AlsoRead: ShearStrengthofSoilbyDirectShearTest Previousarticle 21TypesofDamsinConstruction Nextarticle MethodsofFinishingHardenedConcreteSurface SadanandamAnupojuEDITOR RelatedPosts WhatisLongitudinalSkinReinforcementinaBeam? 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