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1、Designation:D5778?12StardTestMethodfElectronicFrictionConePiezoconePerationTestingofSoils1ThisstardisissuedunderthefixeddesignationD5778thenumberimmediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecase
2、ofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethodcoverstheprocedurefdeterminingthepointres
3、istanceduringperationofaconicalshapedperometerasitisadvancedintosubsurfacesoilsatasteadyrate.1.2Thistestmethodisalsousedtodeterminethefrictionalresistanceofacylindricalsleevelocatedbehindtheconicalpointasitisadvancedthro
4、ughsubsurfacesoilsatasteadyrate.1.3Thistestmethodappliestofrictionconeperometersoftheelectricelectronictype.FieldtestsusingmechanicaltypeperometersarecoveredelsewherebyTestMethodD3441.1.4Thistestmethodcanbeusedtodetermin
5、epewaterpressuresdevelopedduringtheperationthustermedpiezocone.Pewaterpressuredissipationafterapushcanalsobemonitedfcrelationtotimerateofconsolidationpermeability.1.5Additionalsensssuchasinclinometerseismicgeophones(Test
6、MethodsD7400)resistivityelectricalconductivitydielectrictemperaturesenssmaybeincludedintheperometertoprovideusefulinfmation.Theuseofaninclinometerishighlyrecommendedsinceitwillprovideinfmationonpotentiallydamagingsituati
7、onsduringthesoundingprocess.1.6Coneperationtestdatacanbeusedtointerpretsubsurfacestratigraphythroughuseofsitespecificcrelationstheycanprovidedataonengineeringpropertiesofsoilsintendedfuseindesignconstructionofearthwksfou
8、ndationsfstructures.1.7ThevaluesstatedinSIunitsaretoberegardedasstard.WithinSection13onCalculationsSIunitsareconsideredthestard.Othercommonlyusedunitssuchastheinchpoundsystemareshowninbrackets.Thevariousdatareptedshouldb
9、edisplayedinmutuallycompatibleunitsasagreedtobytheclientuser.Conetipprojectedareaiscommonlyreferredtoinsquarecentimetresfconvenience.Thevaluesstatedineachsystemarenotequivalentstherefeeachsystemshallbeusedindependentlyof
10、theother.NOTE1—Thistestmethoddoesnotincludehydraulicpneumaticperometers.Howevermanyoftheproceduralrequirementshereincouldapplytothoseperometers.AlsooffshemarineCPTsystemsmayhaveproceduraldifferencesbecauseofthedifficulti
11、esoftestinginthoseenvironments(fexampletidalvariationssaltwaterwaves).MechanicalCPTsystemsarecoveredunderTestMethodD3441.1.8Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibil
12、ityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D653TerminologyRelatingtoSoilRockContainedFluidsD3441TestMethod
13、fMechanicalConePerationTestsofSoil(Withdrawn2014)3D3740PracticefMinimumRequirementsfAgenciesEngagedinTestingInspectionofSoilRockasUsedinEngineeringDesignConstructionD7400TestMethodsfDownholeSeismicTestingE4PracticesfFceV
14、erificationofTestingMachines3.Terminology3.1Definitions:3.1.1DefinitionsareinaccdancewithTerminologyConvention(D653).3.2DefinitionsofTermsSpecifictoThisStard:3.2.1apparentloadtransfer—apparentresistancemeasuredoneitherth
15、econefrictionsleeveofanelectronicconeperometerwhilethatelementisinanoloadconditionbut1ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoilRockisthedirectresponsibilityofSubcommitteeD18.02onSamplingRelatedFieldTes
16、tingfSoilEvaluations.CurrenteditionapprovedJan.12012.PublishedFebruary2012.iginallyapprovedin1995.Lastpreviouseditionapprovedin2007asD5778–07.DOI:10.1520D577812.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactA
17、STMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3Thelastapprovedversionofthishisticalstardisreferencedonwww.astm.g.ASummaryofChangessectionappearsattheendof
18、thisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates13.2.28pewaterpressureratioparameterBq—theratioofexcesspewaterpressureatthestardmeasurementlocation?u2tocrectedtotalcon
19、eresistanceqtminusthetotalverticaloverburdenstressσvo(seeEq10).3.2.29pushrods—thethickwalledtubesrodsusedtoadvancetheperometertip.3.2.30sleevefrictionsleevefrictionresistance—sameasfrictionsleeveresistance.3.2.31subtract
20、ionerr—anapparentloadtransferfromtheconetothefrictionsleeveofasubtractiontypeelectronicconeperometercausedbyminvoltagedifferencesinresponsetoloadbetweenthetwostrainelementcells.3.3Abbreviations:3.3.1CPT—abbreviationfthec
21、oneperationtest.3.3.2PCPT(23)CPTu(4)—abbreviationfpiezoconeperationtest(note:symbol“u”addedfpewaterpressuremeasurements).3.3.3CPT—abbreviationfthepiezoconeperationtestwithdissipationphasesofpewaterpressures().3.3.4SCPTu—
22、abbreviationfseismicpiezoconetestTestMethodsD7400(includesonemegeophonestoallowdownholegeophysicalwavevelocitymeasurements).3.3.5RCPTu—abbreviationfresistivitypiezocone(includeselectricalconductivityresistivitymodule).4.
23、SummaryofTestMethod4.1Aperometertipwithaconicalpointhavinga60apexangleaconebaseareaof1015cm2isadvancedthroughthesoilataconstantrateof20mms.Thefceontheconicalpoint(cone)requiredtoperatethesoilismeasuredbyelectricalmethods
24、ataminimumofevery50mmofperation.Improvedresolutionmayoftenbeobtainedat2010mmintervalreadings.Stressiscalculatedbydividingthemeasuredfce(totalconefce)bytheconebaseareatoobtainconeresistanceqc.4.2Africtionsleeveispresenton
25、theperometerimmediatelybehindtheconetipthefceexertedonthefrictionsleeveismeasuredbyelectricalmethodsataminimumofevery50mmofperation.Stressiscalculatedbydividingthemeasuredaxialfcebythesurfaceareaofthefrictionsleevetodete
26、rminesleeveresistancefs.4.3Mostmodernperometersarecapableofregisteringpewaterpressureinducedduringadvancementofthepenetrometertipusinganelectronicpressuretransducer.Theseperometersarecalled“piezocones.”Thepiezoconeisadva
27、ncedatarateof20mmsreadingsaretakenataminimumofevery50mmofperation.Thedissipationofeitherpositivenegativeexcesspewaterpressurecanbemonitedbystoppingperationunloadingthepushrodrecdingpewaterpressureasafunctionoftime.Whenpe
28、waterpressurebecomesconstantitismeasuringtheequilibriumvalue(designatedu0)piezometriclevelatthatdepth.5.SignificanceUse5.1Testsperfmedusingthistestmethodprovideadetailedrecdofconeresistancewhichisusefulfevaluationofsites
29、tratigraphyhomogeneitydepthtofirmlayersvoidscavitiesotherdiscontinuities.Theuseofafrictionsleevepewaterpressureelementcanprovideanestimateofsoilclassificationcrelationswithengineeringpropertiesofsoils.Whenproperlyperfmed
30、atsuitablesitesthetestprovidesarapidmeansfdeterminingsubsurfaceconditions.5.2Thistestmethodprovidesdatausedfestimatingengineeringpropertiesofsoilintendedtohelpwiththedesignconstructionofearthwksthefoundationsfstructurest
31、hebehaviofsoilsunderstaticdynamicloads.5.3Thismethodteststhesoilinsitusoilsamplesarenotobtained.Theinterpretationoftheresultsfromthistestmethodprovidesestimatesofthetypesofsoilperated.Engineersmayobtainsoilsamplesfrompar
32、allelbingsfcrelationpurposesbutpriinfmationexperiencemayprecludetheneedfbings.NOTE3—Thequalityoftheresultsproducedbythisstardisdependentonthecompetenceofthepersonalperfmingthetestthesuitabilityoftheequipmentfacilitiesuse
33、d.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentobjectivetestingsamplinginspectionetc.UsersofthisstardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Re
34、liableresultsdependonmanyfactsPracticeD3740providesameansofevaluatingsomeofthosefacts.6.Interferences6.1Refusaldeflectiondamagetotheperometermayoccurincoarsegrainedsoildepositswithmaximumparticlesizesthatapproachexceedth
35、ediameterofthecone.6.2Partiallylithifiedlithifieddepositsmaycauserefusaldeflectiondamagetotheperometer.6.3Stardpushrodscanbedamagedbrokenunderextremeloadings.Theamountoffcethatpushrodsareabletosustainisafunctionoftheunre
36、strainedlengthoftherodstheweaklinksinthepushrodperometertipstringsuchaspushrodjointspushrodperometertipconnections.Thefceatwhichrodsmaybreakisafunctionoftheequipmentconfigurationgroundconditionsduringpenetration.Excessiv
37、eroddeflectionisthemostcommoncausefrodbreakage.7.Apparatus7.1FrictionConePerometer—Theperometertipshouldmeetrequirementsasgivenbelowin10.1.Inaconventionalfrictiontypeconeperometerthefcesattheconetipfrictionsleevearemeasu
38、redbytwoloadcellswithintheperometer.Eitherindependentloadcellssubtractiontypeperometersareacceptablefuse(Fig.1).7.1.1Inthesubtractiontypeperometertheconesleevebothproducecompressivefcesontheloadcells.Theloadcellsarejoine
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