Designation:D8359−21StandardTestMethodforDeterminingtheInSituRockDeformationModulusandOtherAssociatedRockPropertiesUsingaFlexibleVolumetricDilatometer1ThisstandardisissuedunderthefixeddesignationD8359;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodestablishestheguidelines,requirements,procedure,andanalysesfordeterminingtheinsitudeformationmodulusofarockmassandotherancillarydatausingaflexiblevolumetricdilatometerinanN-size,75.7mm(2.98in.)drillhole(Fig.1andFig.2).Cyclic,creep,andunloadingcyclesarenotcoveredindetailinthisstandardbutmaybeaddedinthefutureorwithaseparateteststandard,practice,orguide.NOTE1—Otherrockmassdeformabilitytestsareradialjacktests,flatjacktests,flexibleplatetests,andboreholejacktests.1.2Thistestmethodappliesmainlytoacommerciallyavailableflexible,volumetricdilatometerforanN-size,(75.7-mm(2.98-in.)I.D.)boreholethatisinflatedanddeflatedhydraulicallyintheborehole.However,thetestmethodcouldapplytootherdilatometers,includingpneumaticallyinflated,orfordifferentboreholesizesaswellascoveredundertheBritishStandardsInstituteENISO22476-5(https:⁄⁄geotech-nicaldesign.info).Useofadifferentdiameterortypeofvolumetricdilatometerisuptotheownerorprojectmanagerandshallnotberegardedasnonconformancewiththisstan-dard.1.3Purpose,Application,RangeofUses,andLimitations:1.3.1Thisdesignationisdescribedinthecontextofobtain-ingdataforthedesign,construction,ormaintenanceofstructuresonorinrock.Thismethodcanbeconductedinanyorientationbutisusuallyconductedinaverticalorhorizontalboreholeasdictatedbythedesignconsideration.1.3.2Thetesthasnodepthlimitsotherthanthoseimposedbythelimitationsofthetestequipment,drillholequality,testingpersonnel,andequipmenttodrilltheholesandpositionthetestingassembly.1.3.3Sincethisisavolumetrictest,onlytheaveragedeformat...
