【英文标准名称】:StandardTestMethodforTorsionalRingShearTesttoDetermineDrainedResidualShearStrengthofCohesiveSoils
【原文标准名称】:用扭矩环剪切试验测定粘性土壤排水残余抗剪强度的标准试验方法
【标准号】:ASTMD6467-2006a
【标准状态】:现行
【国别】:
【发布日期】:2006
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D18.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:粘性土;环剪切试验;环形试验;剪切强度;土壤;试验方法
【英文主题词】:consolidated;drainedtestconditions;Mohr-Coulombstrengthenvelope;reconstitutedspecimens;residualshearstrength;ring-sheartest
【摘要】:Theapparatuskeepsthecross-sectionalareaoftheshearsurfaceconstantduringshearandshearsthespecimencontinuouslyinonerotationaldirectionforanymagnitudeofdisplacement.Thisallowsclayparticlestobecomeorientedparalleltothedirectionofshearandaresidualstrengthconditiontodevelop.Theapparatusallowsareconstitutedspecimentobeoverconsolidatedandpreshearedpriortodrainedshearing.Thissimulatesthefieldconditionsthatleadtoapreexistingshearsurfacealongwhichthedrainedresidualstrengthcanbemobilized.Theringsheartestissuitedtotherelativelyrapiddeterminationofdrainedresidualshearstrengthbecauseoftheshortdrainagepaththroughthethinspecimen,andthecapabilityoftestingonespecimenunderdifferentnormalstressestoquicklyobtainashearstrengthenvelope.Thetestresultsareprimarilyapplicabletoassesstheshearstrengthinslopesthatcontainapreexistingshearsurface,suchasoldlandslides,andshearedbeddingplanes,joints,orfaults.Note18212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod:Theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetenttesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotensurereliabletesting.Reliabletestingdependsonseveralfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodprovidesaprocedureforperformingatorsionalringsheartestunderadrainedconditiontodeterminetheresidualshearstrengthofcohesivesoils.Anundisturbedspecimencanbeusedfortesting.However,obtaininganaturalslipsurfacespecimen,determiningthedirectionoffieldshearing,andtrimmingandproperlyaligningtheusuallynon-horizontalshearsurfaceintheringshearapparatusisdifficult.Asaresult,thistestmethodfocusesontheuseofareconstitutedspecimentomeasuretheresidualstrength.Thistestmethodisperformedbydeformingapresheared,reconstitutedspecimenatacontrolleddisplacementrateuntiltheconstantminimumdrainedshearresistanceisofferedonasingleshearplanedeterminedbytheconfigurationoftheapparatus.Anunlimitedamountofcontinuoussheardisplacementcanbeachievedtoobtainaresidualstrengthcondition.Generally,threeormorenormalstressesareappliedtoatestspecimentodeterminethedrainedresidualfailureenvelope.Aseparatetestspecimenmaybeusedforeachnormalstress.1.2Ashearstress-displacementrelationshipmaybeobtainedfromthistestmethod.However,ashearstress-strainrelationshiporanyassociatedquantity,suchasmodulus,cannotbedeterminedfromthistestmethodbecausepossiblesoilextrusionandvolumechangepreventsdefiningtheheightneededintheshearstraincalculations.Asaresult,shearstraincannotbecalculatedbutsheardisplacementcanbecalculated.1.3Theselectionofnormalstressesandfinaldeterminationoftheshearstrengthenvelopefordesignanalysesandthecriteriatointerpretandevaluatethetestresultsaretheresponsibilityoftheengineerorofficerequestingthetest.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesstatedininch-poundunitsareapproximated.1.5AllmeasuredandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistherespo......
【中国标准分类号】:B11
【国际标准分类号】:13_080_20
【页数】:6P.;A4
【正文语种】: