1、Designation:D6467211Standard Test Method forTorsional Ring Shear Test to Determine Drained ResidualShear Strength of Fine-Grained Soils1This standard is issued under the fixed designation D6467;the number immediately following the designation indicates the year oforiginal adoption or,in the case of
2、revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEThe standard was editorially updated in January 2022.1.Scope*1.1 Fine-grained soils in this Test Method are
3、restricted tosoils containing no more than 15%fine sand(100%passingthe 425 m(No.40)sieve and no more than 15%retained onthe 75 m(No.200)sieve).1.2 This test method provides a procedure for performing atorsional ring shear test under a drained condition to determinethe residual shear strength of fine
4、-grained soils.This testmethodisperformedbyshearingareconstituted,overconsolidated,presheared specimen at a controlled dis-placement rate until the constant drained shear resistance isestablished on a single shear surface determined by theconfiguration of the apparatus.1.3 In this test,the specimen
5、rotates in one direction untilthe constant or residual shear resistance is established.Theamount of rotation is converted to displacement using theaverage radius of the specimen and multiplying it by numbersof degrees traveled and 0.0174.1.4 An intact specimen or a specimen with a natural shearsurfa
6、ce can be used for testing.However,obtaining a naturalslip surface specimen,determining the direction of fieldshearing,and trimming and aligning the usually non-horizontalshear surface in the ring shear apparatus is difficult.As a result,this test method focuses on the use of a reconstituted specime
7、nto determine the residual strength.An unlimited amount ofcontinuous shear displacement can be achieved to obtain aresidual strength condition in a ring shear device.1.5 A shear stress-displacement relationship may be ob-tained from this test method.However,a shear stress-strainrelationship or any a
8、ssociated quantity,such as modulus,cannot be determined from this test method because the heightof the shear zone unknown,so an accurate or representativeshear strain cannot be determined.1.6 The selection of effective normal stresses and determi-nation of the shear strength parameters for design an
9、alyses arethe responsibility of the professional or office requesting thetest.Generally,three or more effective normal stresses areapplied to a test specimen in a multi-stage test or a newspecimen can be used for each effective normal stress todetermine the drained residual failure envelope.1.7 The
10、values stated in SI units are to be regarded asstandard.The values given in parentheses are provided forinformation only and are not considered standard.The valuesgiven in parentheses are mathematical conversions to inch-pound units.Reporting of test results in units other than SIshall not be regard
11、ed as nonconformance with this standard.1.8 All measured and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026 unless superseded by this standard.1.8.1 The procedures used to specify how data are collected/recorded or calculated in the
12、standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;a
13、nd it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analysismethods for engineering design.1.9 This standard does not purport to address all of thes
14、afety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.10 This international standard was developed in accor-dance
15、 with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.1This test method is under the jurisdict
16、ion ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.05 on Strength andCompressibility of Soils.Current edition approved Sept.1,2021.Published September 2021.Originallyapproved in 1999.Last previous edition approved in 2013 as D6467 131.DOI:10.1520/D6467-21E01.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standa
