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【英文标准名称】:StandardTestMethodforDeterminingRockQualityDesignation(RQD)ofRockCore
【原文标准名称】:测定岩石芯的岩石质量标号的标准试验方法
【标准号】:ASTMD6032-2008
【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】:classification;index;logging;quality;rock;rockcore;Classification;Drilling(insoil/rock);Logging;Rockmaterials/properties/analysis;RQD(rockqualitydesignation)
【摘要】:TheRQDwasfirstintroducedinthemid1960stoprovideasimpleandinexpensivegeneralindicationofrockmassqualitytopredicttunnellingconditionsandsupportrequirements.TherecordingofRQDhassincebecomevirtuallystandardpracticeindrillcoreloggingforawidevarietyofgeotechnicalinvestigations.TheRQDvaluesprovideabasisformakingpreliminarydesigndecisionsinvolvingestimationofrequireddepthsofexcavationforfoundationsofstructures.TheRQDvaluesalsocanservetoidentifypotentialproblemsrelatedtobearingcapacity,settlement,erosion,orslidinginrockfoundations.TheRQDcanprovideanindicationofrockqualityinquarriesforconcreteaggregate,rockfill,orlargeriprap.TheRQDhasbeenwidelyusedasawarningindicatoroflow-qualityrockzonesthatmayneedgreaterscrutinyorrequireadditionalboringsorotherinvestigationalwork.TheRQDisabasiccomponentofmanyrockmassclassificationsystemsforengineeringpurposes.Usedalone,RQDisnotsufficienttoprovideanadequatedescriptionofrockmassquality.TheRQDdoesnotaccountforjointorientation,tightness,continuity,andgougematerial.TheRQDmustbeusedincombinationwithothergeologicalandgeotechnicalinput.TheRQDissensitivetotheorientationofjointsetswithrespecttotheorientationofthecore.Thatis,ajointsetparalleltothecoreaxiswillnotintersectthecore,unlessthedrillholehappenstorunalongthejoint.Ajointsetperpendiculartothecoreaxiswillintersectthecoreaxisatintervalsequaltothejointspacing.Forintermediateorientations,thespacingofjointintersectionswiththecorewillbeacosinefunctionofanglebetweenjointsandthecoreaxis.CoresizesfromBQtoPQwithcorediametersof36.5mm(1.44in.)and85mm(3.35in.),respectively,arenormallyacceptableformeasuringRQDaslongasproperdrillingtechniquesareusedthatdonotcauseexcesscorebreakageorpoorrecovery,orboth.TheNX-size(54.7mm[2.16in.])andNQ-size(47.5mm[1.87in.])aretheoptimalcoresizesformeasuringRQD.TheRQDisalsousefulforlargecorediametersprovidedthecorediameterisclearlystated.TheRQDcalculatedforcoresmallerthanBQmaynotberepresentativeofthetruequalityoftherockmass.Note18212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodcoversthedeterminationoftherockqualitydesignation(RQD)asastandardparameterindrillcorelogging.1.2AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.2.1Themethodusedtospecifyhowdataarecollected,calculated,orrecordedinthisstandardisnotdirectlyrelatedtotheaccuracytowhichthedatacanbeappliedindesignorotheruses,orboth.Howoneappliestheresultsobtainedusingthisstandardisbeyonditsscope.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisst......
【中国标准分类号】:P13
【国际标准分类号】:73_100_30
【页数】:5P.;A4
【正文语种】:英语