Designation:D4015−15StandardTestMethodsforModulusandDampingofSoilsbyFixed-BaseResonantColumnDevices1ThisstandardisissuedunderthefixeddesignationD4015;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.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,TestMethodD2850,D3999/D3999M,D4767,D5311/D5311M,or...
