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【英文标准名称】:StandardTestMethodforDeterminationofthePointLoadStrengthIndexofRockandApplicationtoRockStrengthClassifications
【原文标准名称】:岩石点负荷强度指数的测定以便用于岩石强度分类的标准试验方法
【标准号】:ASTMD5731-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:compressivestrength;indextest;pointload;rock;rockclassification;Compressiontesting--rock/relatedmaterials;Indextest;Pointloadstrengthtest;Rockmaterials/properties/analysis
【摘要】:Theuniaxialcompressiontest(seeTestMethodD7012)isusedtodeterminecompressivestrengthofrockspecimens.However,itisatime-consumingandexpensivetestthatrequiressignificantspecimenpreparationandtheresultsmaynotbeavailableforalongtimeafterthesamplesarecollected.Whenextensivetestingand/ortimelyinformationisrequiredforpreliminaryandreconnaissanceinformation,alternativetestssuchasthepointloadtestcanbeusedtoreducethetimeandcostofcompressivestrengthtests,whenusedinthefield.Suchdatacanbeusedtomaketimelyandmoreinformeddecisionsduringtheexplorationphasesandmoreefficientandcosteffectiveselectionofsamplesformorepreciseandexpensivelaboratorytests.Thepointloadstrengthtestisusedasanindextestforstrengthclassificationofrockmaterials.Thetestresultsshouldnotbeusedfordesignoranalyticalpurposes.Thistestmethodisperformedtodeterminethepointloadstrengthindexofrockspecimensand,ifrequired,thepointloadstrengthanisotropyindex.Rockspecimensintheformofeithercore(thediametralandaxialtests),cutblocks(theblocktest),orirregularlumps(theirregularlumptest)aretestedbyapplicationofconcentratedloadthroughapairoftruncated,conicalplatens.Littleornospecimenpreparationisrequiredandcanthereforebetestedshortlyafterbeingobtainedandanyinfluenceofmoistureconditiononthetestdataminimized.However,theresultscanbehighlyinfluencedbyhowthespecimenistreatedfromthetimeitisobtaineduntilthetimeitistested.Therefore,itmaybenecessarytohandlespecimensinaccordancewithPracticeD5079andtodocumentmoistureconditionsinsomemannerinthedatacollection.Note18212;Thequalityoftheresultproducedbythisstandardisdependentuponthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetestingandsampling.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodcoverstheguidelines,requirements,andproceduresfordeterminingthepointloadstrengthindexofrock.Thisisanindextestandisintendedtobeusedtoclassifyrockstrength.1.2Specimensintheformofrockcores,blocks,orirregularlumpswithatestdiameterfrom30to85mmcanbetestedbythistestmethod.1.3Thistestmethodcanbeperformedineitherthefieldorlaboratory.Thetestistypicallyusedinthefieldbecausethetestingmachineisportable,littleorminimalspecimenpreparationisrequired,andspecimenscanbetestedwithinashorttimeframeofbeingcollected.1.4Thistestmethodappliestomediumstrengthrock(compressivestrengthover15MPa(2200psi)).1.5Thistestmethoddoesnotcoverwhichtypeofspecimenshouldbetestedorwhetheranisotropicfactorsshouldbeconsidered.Thespecificsofthepointloadtestprogramneedtobedevelopedpriortotestingandpossiblyevenbeforesampling.Suchspecificswouldbedependentontheintendeduseofthedata,aswellaspossiblebudgetaryconstraintsandpossibleotherfactors,whichareoutsidethescopeofthistestmethod.1.6AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.7Themethoduse......
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:11P.;A4
【正文语种】:英语