Designation:D1586/D1586M−18´1StandardTestMethodforStandardPenetrationTest(SPT)andSplit-BarrelSamplingofSoils1ThisstandardisissuedunderthefixeddesignationD1586/D1586M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.ε1NOTE—Reference(14)waseditoriallycorrectedinApril2022.1.Scope*1.1Thistestmethoddescribestheprocedure,generallyknownastheStandardPenetrationTest(SPT),fordrivingasplit-barrelsamplerwitha140lb[63.5kg]hammerdropped30in.[750mm]toobtainasoilsampleforidentificationpurposes,andmeasuretheresistanceofthesoiltopenetrationofthestandard2in.[50mm]diametersampler.TheSPT“N”valueisthenumberofhammerblowsrequiredtodrivethesampleroverthedepthintervalof0.5to1.5ft[0.15to0.45m]ofa1.5ft[0.45m]driveinterval.1.2TestMethodD4633isgenerallynecessarytomeasurethedrillrodenergyofagivendrophammersystemandusingthemeasureddrillrodenergy,Nvaluescanbecorrectedtoastandardenergylevel.PracticeD6066usesTestMethodsD1586andD4633andhasadditionalrequirementsforhammers,hammerenergy,anddrillingmethodstodetermineenergycorrectedpenetrationresistanceofloosesandsforliquefactionevaluation.1.3PracticeD3550/D3550Misasimilarprocedureusingalargerdiametersplitbarrelsamplerdrivenwithahammersystemthatmayallowforadifferenthammermass.ThepenetrationresistancevaluesfromPracticeD3550/D3550Mdonotcomplywiththisstandard.1.4Testresultsandidentificationinformationareusedinsubsurfaceexplorationforawiderangeofapplicationssuchasgeotechnical,geologic,geoenvironmental,orgeohydrologicalexplorations.Whendetailedlithologyisrequiredforgeohy-drologicalinvestigations,useofcontinuoussamplingmethods(D6282/D6282M,D6151/D6151M,D6914/D6914M)arerec-ommendedwhentheincrementalSPTNvalueisnotneededfordesignpurposes(see4.1.1).1.5Penetrationresistancetestingist...
