ASTM D5311-1992(2004) 土壤的负荷控制三向疲劳强度的测试方法

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【英文标准名称】:StandardTestMethodforLoadControlledCyclicTriaxialStrengthofSoil
【原文标准名称】:土壤的负荷控制三向疲劳强度的测试方法
【标准号】:ASTMD5311-1992(2004)
【标准状态】:现行
【国别】:
【发布日期】:1992
【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】:压缩试验;土力学;土壤普查
【英文主题词】:consolidated-undrainedtests;cohesionlesssoils;laboratorytests;liquefaction;triaxialtests
【摘要】:Cyclictriaxialstrengthtestresultsareusedforevaluatingtheabilityofasoiltoresisttheshearstressesinducedinasoilmassduetoearthquakeorothercyclicloading.5.1.1Cyclictriaxialstrengthtestsmaybeperformedatdifferentvaluesofeffectiveconfiningpressureonisotropicallyconsolidatedspecimenstoprovidedatarequiredforestimatingthecyclicstabilityofasoil.5.1.2Cyclictriaxialstrengthtestsmaybeperformedatasingleeffectiveconfiningpressure,usuallyequalto14.5lb/in.2(100kN/m2),oralternatepressuresasappropriateonisotropicallyconsolidatedspecimenstocomparecyclicstrengthresultsforaparticularsoiltypewiththatofothersoils,Ref(2).Thecyclictriaxialtestisacommonlyusedtechniquefordeterminingcyclicsoilstrength.Cyclicstrengthdependsuponmanyfactors,includingdensity,confiningpressure,appliedcyclicshearstress,stresshistory,grainstructure,ageofsoildeposit,specimenpreparationprocedure,andthefrequency,uniformity,andshapeofthecyclicwaveform.Thus,closeattentionmustbegiventotestingdetailsandequipment.1.1Thistestmethodcoversthedeterminationofthecyclicstrength(sometimescalledtheliquefactionpotential)ofsaturatedsoilsineitherundisturbedorreconstitutedstatesbytheload-controlledcyclictriaxialtechnique.1.2Thecyclicstrengthofasoilisevaluatedrelativetoanumberoffactors,including:thedevelopmentofaxialstrain,magnitudeofappliedcyclicstress,numberofcyclesofstressapplication,developmentofexcesspore-waterpressure,andstateofeffectivestress.Acomprehensivereviewoffactorsaffectingcyclictriaxialtestresultsiscontainedintheliterature().1.3Cyclictriaxialstrengthtestsareconductedunderundrainedconditionstosimulateessentiallyundrainedfieldconditionsduringearthquakeorothercyclicloading.1.4Cyclictriaxialstrengthtestsaredestructive.Failuremaybedefinedonthebasisofthenumberofstresscyclesrequiredtoreachalimitingstrainor100%porepressureratio.SeeSectionforTerminology.1.5Thistestmethodisgenerallyapplicablefortestingcohesionlessfreedrainingsoilsofrelativelyhighpermeability.Whentestingwell-gradedmaterials,silts,orclays,itshouldberecognizedthatpore-waterpressuresmonitoredatthespecimenendstonotingeneralrepresentpore-wat
【中国标准分类号】:P13
【国际标准分类号】:
【页数】:10P.;A4
【正文语种】: