Designation:D4015−15´1StandardTestMethodsforModulusandDampingofSoilsbyFixed-BaseResonantColumnDevices1ThisstandardisissuedunderthefixeddesignationD4015;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditoriallycorrectedEq28inFebruary2017.1.Scope*1.1Thesetestmethodscoverthedeterminationofshearmodulusandsheardampingasafunctionofshearstrainamplitudeforsolidcylindricalspecimensofsoilinintactandremoldedconditionsbyvibrationusingresonantcolumnde-vices.Thevibrationofthespecimenmaybesuperposedonacontrolledstaticstateofstressinthespecimen.Thevibrationapparatusandspecimenmaybeenclosedinatriaxialchamberandsubjectedtoanall-aroundpressureandaxialload.Inaddition,thespecimenmaybesubjectedtoothercontrolledconditions(forexample,pore-waterpressure,degreeofsaturation,temperature).Thesetestmethodsofmodulusanddampingdeterminationareconsiderednondestructivewhentheshearstrainamplitudesofvibrationarelessthan10–2%(10–4in.⁄in.),andmanymeasurementsmaybemadeonthesamespecimenandwithvariousstatesofstaticstress.1.2Twodeviceconfigurationsarecoveredbythesetestmethods:DeviceType1whereaknowntorqueisappliedtothetopofthespecimenandtheresultingrotationalmotionismeasuredatthetopofthespecimen,andDeviceType2whereanuncalibratedtorqueisappliedtothetopofthespecimenandthetorquetransmittedthroughthespecimenismeasuredbyatorquetransduceratthebaseofthespecimen.Forbothdevices,thetorqueisappliedtotheactiveend(usuallytop)ofthespecimenandtherotationalmotionalsoismeasuredattheactiveendofthespecimen.1.3Thesetestmethodsarelimitedtothedeterminationoftheshearmodulusandsheardamping,thenecessaryvibration,andspecimenpreparationproceduresrelatedtothevibration,etc.,anddonotcovertheapplication,measurement,orcontroloftheaxialandlateralstaticnormalstresses.Thelatterproceduresmaybecoveredby,butarenotlimitedto...
