【英文标准名称】:StandardTestMethodsfortheDeterminationoftheModulusandDampingPropertiesofSoilsUsingtheCyclicTriaxialApparatus
【原文标准名称】:用循环三轴器测定土壤的阻尼特性和模数的标准试验方法
【标准号】:ASTMD3999-1991(2003)
【标准状态】:现行
【国别】:
【发布日期】:1991
【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】:D18.09
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:土壤学;潮气;试验
【英文主题词】:damping;laboratorytest;physicalproperties;triaxialstress
【摘要】:Thecyclictriaxialmodulusanddampingtestprovidesparametersthatmaybeconsideredforuseindynamic,linearandnon-linearanalyticalmethods.Thesetestmethodsareusedfortheperformanceevaluationofbothnaturalandengineeredstructuresunderdynamicofcyclicloadssuchascausedbyearthquakes,oceanwave,orblast.OneoftheprimarypurposesofthesetestmethodsistoobtaindatathatareusedtocalculateYoungrsquo;modulus.Note18212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.DESIG:D399991(Reapproved2003)^TITLE:StandardTestMethodsfortheDeterminationoftheModulusandDampingPropertiesofSoilsUsingtheCyclicTriaxialApparatus^SCOPE:1.Scope1.1Thesetestmethodscoverthedeterminationofthemodulusanddampingpropertiesofsoilsineitherundisturbedorreconstitutedstatesbyeitherloadorstrokecontrolledcyclictriaxialtechniques.1.2Thecyclictriaxialpropertiesofsoilareevaluatedrelativetoanumberoffactorsincluding:strainlevel,density,numberofcycles,materialtype,saturation,andeffectivestress.1.3Thesetestmethodsareapplicabletobothfine-grainedandcoarse-grainedsoilsasdefinedbytheunifiedsoilclassificationsystemorbyClassificationD2487.Testspecimensmaybeundisturbedorreconstitutedbycompactioninthelaboratory.1.4TwotestmethodsareprovidedforusingacyclicloadertodetermineYoung''smodulus(E)anddamping(D)properties.Thefirsttestmethod(A)permitsthedeterminationofEandDusingaconstantloadapparatus.Thesecondtestmethod(B)permitsthedeterminationofEandDusingaconstantstrokeapparatus.Thetestmethodsareasfollows:1.4.1TestMethodAThistestmethodrequirestheapplicationofaconstantcyclicloadtothetestspecimen.ItisusedfordeterminingtheYoung''smodulusanddampingunderaconstantloadcondition.1.4.2TestMethodBThistestmethodrequirestheapplicationofaconstantcyclicdeformationtothetestspecimen.ItisusedfordeterminingtheYoung''smodulusanddampingunderaconstantstrokecondition.1.5Thedevelopmentofrelationshipstoaidininterpretingandevaluatingtestresultsarelefttotheengineerorofficerequestingthetest.1.6LimitationsTherearecertainlimitationsinherentinusingcyclictriaxialteststosimulatethestressandstrainconditionsofasoilelementinthefieldduringanearthquake.1.6.1Nonuniformstressconditionswithinthetestspecimenareimposedbythespecimenendplatens.1.6.2A90changeinthedirectionofthemajorprincipalstressoccursduringthetwohalvesoftheloadingcycleonisotropicallyconfinedspecimensandatcertainlevelsofcyclicstressapplicationonanisotropicallyconfinedspecimens.1.6.3Themaximumcyclicaxialstressthatcanbeappliedtoasaturatedspecimeniscontrolledbythestressconditionsattheendofconfiningstressapplicationandthepore-waterpressuresgeneratedduringtesting.Foranisotropicallyconfinedspecimentestedincycliccompression,themaximumcyclicaxialstressthatcanbeappliedtothespecimenisequaltotheeffectiveconfiningpressure.Sincecohe......
【中国标准分类号】:Z13
【国际标准分类号】:
【页数】:15P.;A4
【正文语种】: