Designation:D6066−11StandardPracticeforDeterminingtheNormalizedPenetrationResistanceofSandsforEvaluationofLiquefactionPotential1ThisstandardisissuedunderthefixeddesignationD6066;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeoutlinesaproceduretoobtainarecordofnormalizedresistanceofsandstothepenetrationofastandardsamplerdrivenbyastandardenergyforestimatingsoilliquefactionpotentialduringearthquakes.Thenormalizedpenetrationresistancedeterminedinthispracticemaybeusefulfordeterminationofotherengineeringpropertiesofsands.1.2ThispracticeusesTestMethodD1586withadditionsandmodificationstominimizedisturbanceofsaturatedloosecohesionlesssandsduringdrilling.ThispracticecombinesresultsofTestMethodD1586andinterpretsthedatafornormalizationpurposes.1.3DuetoinherentvariabilityoftheSPT,guidanceisgivenontestconfigurationandenergyadjustments.Penetrationresistanceisadjustedforenergydeliveredinthepenetrationtest.Energyadjustmentscanbeestimatedormeasuredandreported.1.4Standardpracticefornormalizingpenetrationresistancevaluesisgiven.Penetrationresistancedataarenormalizedtoastandardoverburdenstresslevel.1.5Thenormalizedpenetrationresistancedatamaybeusedtoestimateliquefactionresistanceofsaturatedsandsfromearthquakeshaking.Evaluationofliquefactionresistancemaybeappliedtonaturalgroundconditionsorfoundationsforeitherplannedorexistingstructures.1.6Usingthispracticerepresentativedisturbedsamplesofthesoilcanbecollectedforidentificationpurposes.1.7Thispracticeislimitedtouseincohesionlesssoils(seeTestMethodD2487andclassificationsofSM,SW,SP,SP-SM,andSW-SMPracticeD2488).Inmostcases,testingisper-formedinsaturateddepositsbelowthewatertable.Insomecases,drysandsmaybetested(see5.4).Thispracticeisnotapplicabletolithifiedmaterialsorfinegrainedsoils.Gravelcaninterferewiththetest...
