1、Designation:D707016Standard Test Methods forCreep of Rock Core Under Constant Stress andTemperature1This standard is issued under the fixed designation D7070;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These test methods cover the creep behavior of intactweak and hard rock core in fixed states of stress at ambient(room)or elevated temper
3、atures.For creep behavior at lowertemperatures refer to Test Method D5520.The methods specifythe apparatus,instrumentation,and procedures necessary todetermine the strain as a function of time under sustained loadat constant temperature and when applicable,constant humid-ity.1.1.1 Hard rocks are con
4、sidered those with a maximumaxial strain at failure of less than 2%.Weak rocks include suchmaterials as salt,potash,shale,and weathered rock,whichoften exhibit very large strain at failure.1.2 This standard consists of three methods that cover thecreep capacity of core specimens.1.2.1 Method ACreep
5、of Hard Rock Core Specimens inUniaxial Compression at Ambient or Elevated Temperature.1.2.2 Method BCreep of Weak Rock Core Specimens inUniaxial Compression at Ambient or Elevated Temperature.1.2.3 Method CCreep of Rock Core Specimens in TriaxialCompression at Ambient or Elevated Temperature.1.3 All
6、 observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.4 The procedures used to specify how data are collected/recorded and calculated in this standard are regarded as theindustry standard.In addition,they are representative
7、of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining data,special purpose studies,or any considerationsfor the users objectives;and it is common practice to increaseor reduce significant digits of reported data to com
8、mensuratewith these considerations.It is beyond the scope of these testmethods to consider significant digits used in analysis methodsfor engineering design.1.5 UnitsThe values stated in SI units are to be regardedas the standard.The values given in parentheses are mathemati-cal conversions to inch-
9、pound units that are provided forinformation only and are not considered standard.1.6 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 to d
10、etermine theapplicability of regulatory limitations prior to use.For specificprecautionary statements,see Section 7.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD2113 Practice for Rock Core Drilling and Sampling ofRock for Site ExplorationD2216
11、Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD2845 Test Method for Laboratory Determination of PulseVelocities and Ultrasonic Elastic Constants of RockD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and R
12、ock asUsed in Engineering Design and ConstructionD4543 Practices for Preparing Rock Core as Cylindrical TestSpecimens and Verifying Conformance to Dimensionaland Shape TolerancesD5079 Practices for Preserving and Transporting Rock CoreSamplesD5520 Test Method for Laboratory Determination of CreepPro
13、perties of Frozen Soil Samples by Uniaxial Compres-sionD6026 Practice for Using Significant Digits in GeotechnicalDataE4 Practices for Force Verification of Testing MachinesE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or Proce
14、ss1This test method is under the jurisdiction of ASTM Committee D18 and is thedirect responsibility of Subcommittee D18.12 on Rock Mechanics.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 2004.Last previous edition approved in 2008 as D7070-08.DOI:10.1520/D7070-16.
15、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.*A Summary of Changes section appears at the end of this standardC
16、opyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Terminology3.1 Definitions:3.1.1 For definitions of common technical terms used in thisstandard,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 hard rockrock core exhibiting less than 2%strain atfailure when tested in uniaxial compression.3.2.2 weak rockrock core exhibiting 2%or greater strainat failure when tested in uniaxial compression.3.2.3 true st
