Designation:D7499/D7499M−09(Reapproved2014)StandardTestMethodforMeasuringGeosynthetic-SoilResilientInterfaceShearStiffness1ThisstandardisissuedunderthefixeddesignationD7499/D7499M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddetailshowcyclicloadingisappliedtogeosyntheticsembeddedinsoiltodeterminetheapparentstiffnessofthesoil–geosyntheticinterface.1.2Resilientinterfaceshearstiffnessdescribestheshearstiffnessbetweenageosyntheticanditssurroundingsoilunderconditionsofsmallcyclicloads.1.3Thistestmethodisintendedtoprovidepropertiesfordesign.Thetestmethodwasdevelopedformechanisticem-piricalpavementdesignmethodsrequiringinputoftheresilientinterfaceshearstiffness.Theuseofthisparameterfromthistestmethodforotherapplicationsinvolvingcyclicloadingshouldbeevaluatedonacase-by-casebasis.Itcanalsobeusedtocomparedifferentgeosynthetics,soiltypes,etc.,andtherebybeusedasaresearchanddevelopmenttestprocedure.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Thisstandardmayinvolvehazardousmaterials,andequipment.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD653TerminologyRelatingtoSoil,Rock,andContainedFluidsD3080/D3080MTestMethodforDirectShearTestofSoilsUnderConsolidatedDrainedConditionsD4439TerminologyforGeosyntheticsD4354PracticeforSamplingofGeosyntheticsandRolledErosionCont...
