【英文标准名称】:StandardTestMethodforDeterminingInSituModulusofDeformationofRockUsingDiametricallyLoaded76-mm(3-in.)BoreholeJack
【原文标准名称】:用径向加载76mm(3in)钻孔顶出装置测量岩石变型模量的标准试验方法
【标准号】:ASTMD4971-2008
【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】:anisotropy;boreholedrilling;deformation;displacement;jacktest;loadingtests;modulusofdeformation;orientation;pressuretesting;rock;Boreholedrilling;Deformation--rock;Displacement--rockenvironments;Jacktest;Loadingtests--rock/related
【摘要】:Resultsofthistestmethodareusedtopredictdisplacementsinrockmasscausedbyloadsfromastructureorfromundergroundconstruction.Itisoneofseveralteststhatshouldbeperformed.Becausethejackcanapplydirectedloads,thistestmethodcanbeperformedtoprovideanestimateofanisotropy.Intheory,theanalysisoftestdataisstraightforward;themodulusestimaterequiresarecordofappliedhydraulicpressureversusboreholediameterchange,andaknowledgeoftherock''sPoisson''sratio.Inpractice,theaboveprocedure,usingtheoriginaltheoreticalformula,frequentlyhasresultedincomputingamaterialmodulusthatwasdemonstrablytoolow.Foranalyzingthetestdataitisassumedthattherockmassislinearlyelastic,isotropic,andhomogeneous.Withintheseassumptions,thistestmethodcanprovideusefuldataforrockmassesforwhichequivalentcontinuouspropertiescannotbefoundorestimated.Note18212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod;theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliabletesting.Reliabletestingdependsonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodcoverstheestimationofinsitumodulusofarockmassatvariousdepthsandorientations.Informationontime-dependentdeformationmayalsobeobtained.1.2AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.2.1Themethodusedtospecifyhowdataarecollected,calculated,orrecordedinthisstandardisnotdirectlyrelatedtotheaccuracytowhichthedatacanbeappliedindesignorotheruses,orboth.Howoneappliestheresultsobtainedusingthisstandardisbeyonditsscope.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:7P.;A4
【正文语种】:英语