ASTM_D_2664_-_04.pdf

Designation:D 2664 04Standard Test Method forTriaxial Compressive Strength of Undrained Rock CoreSpecimens Without Pore Pressure Measurements1This standard is issued under the fixed designation D 2664;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of thestrength of cylindrical rock core specimens in an undrainedstate under triaxial compression loading.The test provides datauseful in determining the strength of rock,namely:shearstrengths at various lateral pressures and temperatures,angle ofinternal friction,(angle of shearing resistance),cohesion inter-cept,and Youngs modulus.It should be observed that thismethod makes no provision for pore pressure measurements.Thus the strength values determined are in terms of total stress,that is,not corrected for pore pressures.1.2 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D 6026.1.2.1 The method used to specify how data are collected,calculated,or recorded in this standard is not directly related tothe accuracy to which the data can be applied in design or otheruses,or both.How one applies the results obtained using thisstandard is beyond its scope.1.3 The values stated in SI units are to be regarded as thestandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D 653 Terminology Relating to Soil,Rock and ContainedFluidsD 2216 Test Method for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD 3740 Practice for Minimum Requirements for AgenciesEngaged in the Testing and/or Inspection of Soil and Rockas Used in Engineering Design and ConstructionD 4543 Practice for Preparing Rock Core Specimens andDetermining Dimensional and Shape TolerancesD 6026 Practice for Using Significant Digits in Geotechni-cal DataE 4 Practices for Force Verification of Testing MachinesE 122 Practice for Choice of Sample Size to Estimate aMeasure of Quality for a Lot or ProcessE 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 A rock core sample is cut to length and the ends aremachined flat.The specimen is placed in a triaxial loadingchamber,subjected to confining pressure,and,if required,heated to the desired test temperature.Axial load is continu-ously increased on the specimen until peak load and failure areobtained.4.Significance and Use4.1 Strength of rock is known to be a function of confiningpressure.The triaxial compression test is commonly used tosimulate the stress conditions under which most undergroundrock masses exist.4.2 The strength properties of rock cores measured in thelaboratory usually do not accurately reflect large scale in situproperties because the latter are strongly influenced by joints,faults,inhomogeneities,weakness planes,and other factors.Therefore,laboratory values for intact specimens must beemployed with proper judgment in engineering applications.NOTE1Notwithstanding the statements on precision and bias con-tained in this test method;the precision of this test method is dependenton the competence of the personnel performing it,and the suitability of theequipment and facilities used.Agencies that meet the criteria of PracticeD 3740 are generally considered capable of competent and objectivetesting.Users of this test method are cautioned that compliance withPractice D 3740 does not in itself assure reliable testing.Reliable testingdepends on many factors;Practice D 3740 provides a means of evaluatingsome of those factors.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics.Current edition approved July 1,2004.Published July 2004.Originally approvedin 1967.Last previous edition approved in 1995 as D 2664 95a.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information5.Apparatus5.1 Loading DeviceThe loading device shall