Designation:D4971−08StandardTestMethodforDeterminingInSituModulusofDeformationofRockUsingDiametricallyLoaded76-mm(3-in.)BoreholeJack1ThisstandardisissuedunderthefixeddesignationD4971;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoverstheestimationofinsitumodulusofarockmassatvariousdepthsandorientations.Informationontime-dependentdeformationmayalsobeob-tained.1.2AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.2.1Themethodusedtospecifyhowdataarecollected,calculated,orrecordedinthisstandardisnotdirectlyrelatedtotheaccuracytowhichthedatacanbeappliedindesignorotheruses,orboth.Howoneappliestheresultsobtainedusingthisstandardisbeyonditsscope.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinforma-tiononlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D653TerminologyRelatingtoSoil,Rock,andContainedFluidsD3740PracticeforMinimumRequirementsforAgenciesEngagedinTestingand/orInspectionofSoilandRockasUsedinEngineeringDesignandConstructionD6026PracticeforUsingSignificantDigitsinGeotechnicalDataD6032TestMethodforDeterminingRockQualityDesigna-tion(RQD)ofRockCore3.Terminology3.1SeeTerminologyD653forgeneraldefinitions.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1deformation—changeinshapeorsize,(seeTerminol-ogyD653).Inthistestmethoddeformationisthechangeinthediameteroftheborehole.3.2.2modulusofdeformation—ratioofstresstostra...
