【英文标准名称】:StandardTestMethodforCompressiveStrengthandElasticModuliofIntactRockCoreSpecimensunderVaryingStatesofStressandTemperatures
【原文标准名称】:完整岩芯样本在不同应力和温度条件下的抗压强度和弹性模数的标准试验方法
【标准号】:ASTMD7012-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D18.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bulkmodulus;compressiontesting;compressivestrength;confinedcompression;elasticmoduli;loadingtests;modulusofelasticity;Mohrstresscircle;Poisson&x2019;sratio;repeatability;reproducibility;rock;shearmodulu
【摘要】:TheparametersobtainedfromMethodsAandBareintermsofundrainedtotalstress(asalreadymentionedin1.1).However,therearesomecaseswhereeithertherocktypeortheloadingconditionoftheproblemunderconsiderationwillrequiretheeffectivestressordrainedparametersbedetermined.Uniaxialcompressivestrength(MethodC)ofrockisusedinmanydesignformulasandissometimesusedasanindexpropertytoselecttheappropriateexcavationtechnique.Deformationandstrengthofrockareknowntobefunctionsofconfiningpressure.Thetriaxialcompressiontest(MethodA)iscommonlyusedtosimulatethestressconditionsunderwhichmostundergroundrockmassesexist.Theelasticconstants(MethodsBandD)areusedtocalculatethestressanddeformationinrockstructures.Thedeformationandstrengthpropertiesofrockcoresmeasuredinthelaboratoryusuallydonotaccuratelyreflectlarge-scaleinsitupropertiesbecausethelatterarestronglyinfluencedbyjoints,faults,inhomogeneities,weaknessplanes,andotherfactors.Therefore,laboratoryvaluesforintactspecimensmustbeemployedwithproperjudgmentinengineeringapplications.Note28212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod;themeasuresofprecisionofthesetestmethodsaredependentonthecompetenceofthepersonnelperformingthem,andonthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliabletesting.Reliabletestingdependsonmanyfactors;PracticeD3740providesameansforevaluatingsomeofthosefactors.1.1Thesetestmethodscoverthedeterminationofthestrengthofintactrockcorespecimensinuniaxialandtriaxialcompression.Thetestsprovidedataindeterminingthestrengthofrock,namely:theuniaxialstrength,shearstrengthsatdifferentpressuresanddifferentelevatedtemperatures,angleofinternalfriction,(angleofshearingresistance),andcohesionintercept.Thetestmethodsspecifytheapparatus,instrumentation,andproceduresfordeterminingthestress-axialstrainandthestress-lateralstraincurves,aswellasYoung''smodulus,E,andPoisson''sratio,x03C5;.Itshouldbeobservedthatthesemethodsmakenoprovisionforporepressuremeasurementsandspecimensareundrained(platensarenotvented).Thusthestrengthvaluesdeterminedareintermsoftotalstress,thatis,arenotcorrectedforporepressures.Thesetestmethodsdonotincludetheproceduresnecessarytoobtainastress-straincurvebeyondtheultimatestrength.1.2ThisstandardreplacesandcombinesthefollowingStandardTestMethods:D2664TriaxialCompressiveStrengthofUndrainedRockCoreSpecimensWithoutPorePressureMeasurements;D5407ElasticModuliofUndrainedRockCoreSpecimensinTriaxialCompressionWithoutPorePressureMeasurements;D2938UnconfinedCompressiveStrengthofIntactRockCoreSpecimens;andD3148ElasticModuliofIntactRockCoreSpecimensinUniaxialCompression.TheoriginalfourstandardsarenowreferredtoasMethodsinthisstandard.1.2.1MethodA:TriaxialCompressiveStrengthofUndrainedRockCoreSpecimensWithoutPorePressureMeasurements.1.2.2MethodB:ElasticModuliofUndrainedRockCoreSpeci......
【中国标准分类号】:P13
【国际标准分类号】:13_080_20
【页数】:9P.;A4
【正文语种】:英语