ASTM D6467-21
(Test Method)Standard Test Method for Torsional Ring Shear Test to Determine Drained Residual Shear Strength of Fine-Grained Soils
Standard Test Method for Torsional Ring Shear Test to Determine Drained Residual Shear Strength of Fine-Grained Soils
SIGNIFICANCE AND USE
5.1 The ring shear test is suited to the relatively rapid determination of drained residual shear strength because of the short drainage path through the thin specimen, the constant cross-sectional area of the shear surface during shear, unlimited rotational displacement in one direction, and the capability of testing one specimen under different effective normal stresses to obtain clay particles that are oriented parallel to the direction of shear to obtain residual shear strength envelope.
5.2 The apparatus allows a reconstituted specimen to be overconsolidated and presheared prior to drained shearing. Overconsolidation and preshearing of the reconstituted specimen significantly reduces the horizontal displacement required to reach a residual condition, and therefore, reduces soil extrusion, wall friction, and other problems (Stark and Eid, 1993)3. This simulates a preexisting shear surface along which the drained residual strength can be mobilized.
5.3 The ring shear test specimen is annular so the angular displacement differs from the inner edge to the outer edge. At the residual condition, the shear strength is constant across the specimen so the difference in shear stress between the inner and outer edges of the specimen is negligible.
Note 1: Notwithstanding the statements on precision and bias contained in this test method: The precision of this test method is dependent on the competence of the personnel performing it and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent testing. Users of this test method are cautioned that compliance with Practice D3740 does not ensure reliable testing. Reliable testing depends on several factors; Practice D3740 provides a means of evaluating some of those factors.
SCOPE
1.1 Fine-grained soils in this Test Method are restricted to soils containing no more than 15 % fine sand (100 % passing the 425 μm (No. 40) sieve and no more than 15 % retained on the 75 μm (No. 200) sieve).A Summary of Changes section appears at the end of this standard.
1.2 This test method provides a procedure for performing a torsional ring shear test under a drained condition to determine the residual shear strength of fine-grained soils. This test method is performed by shearing a reconstituted, overconsolidated, presheared specimen at a controlled displacement rate until the constant drained shear resistance is established on a single shear surface determined by the configuration of the apparatus.
1.3 In this test, the specimen rotates in one direction until the constant or residual shear resistance is established. The amount of rotation is converted to displacement using the average radius of the specimen and multiplying it by numbers of degrees traveled and 0.0174.
1.4 An intact specimen or a specimen with a natural shear surface can be used for testing. However, obtaining a natural slip surface specimen, determining the direction of field shearing, and trimming and aligning the usually non-horizontal shear surface in the ring shear apparatus is difficult. As a result, this test method focuses on the use of a reconstituted specimen to determine the residual strength. An unlimited amount of continuous shear displacement can be achieved to obtain a residual strength condition in a ring shear device.
1.5 A shear stress-displacement relationship may be obtained from this test method. However, a shear stress-strain relationship or any associated quantity, such as modulus, cannot be determined from this test method because the height of the shear zone unknown, so an accurate or representative shear strain cannot be determined.
1.6 The selection of effective normal stresses and determination of the shear strength parameters for design analyses are the responsibility of the professional or office requesting the test. Generally, three or more effective normal s...
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Designation: D6467 − 21
Standard Test Method for
Torsional Ring Shear Test to Determine Drained Residual
1
Shear Strength of Fine-Grained Soils
This standard is issued under the fixed designation D6467; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* of the shear zone unknown, so an accurate or representative
shear strain cannot be determined.
1.1 Fine-grained soils in this Test Method are restricted to
soils containing no more than 15% fine sand (100% passing
1.6 The selection of effective normal stresses and determi-
the 425µm (No. 40) sieve and no more than 15% retained on
nation of the shear strength parameters for design analyses are
the 75µm (No. 200) sieve).
the responsibility of the professional or office requesting the
test. Generally, three or more effective normal stresses are
1.2 This test method provides a procedure for performing a
applied to a test specimen in a multi-stage test or a new
torsional ring shear test under a drained condition to determine
specimen can be used for each effective normal stress to
the residual shear strength of fine-grained soils. This test
determine the drained residual failure envelope.
method is performed by shearing a reconstituted,
overconsolidated, presheared specimen at a controlled dis-
1.7 The values stated in SI units are to be regarded as
placement rate until the constant drained shear resistance is
standard. The values given in parentheses are provided for
established on a single shear surface determined by the
information only and are not considered standard. The values
configuration of the apparatus.
given in parentheses are mathematical conversions to inch-
pound units. Reporting of test results in units other than SI
1.3 In this test, the specimen rotates in one direction until
shall not be regarded as nonconformance with this standard.
the constant or residual shear resistance is established. The
amount of rotation is converted to displacement using the
1.8 All measured and calculated values shall conform to the
average radius of the specimen and multiplying it by numbers
guidelines for significant digits and rounding established in
of degrees traveled and 0.0174.
Practice D6026 unless superseded by this standard.
1.4 An intact specimen or a specimen with a natural shear
1.8.1 Theproceduresusedtospecifyhowdataarecollected/
surface can be used for testing. However, obtaining a natural
recorded or calculated in the standard are regarded as the
slip surface specimen, determining the direction of field
industry standard. In addition, they are representative of the
shearing,andtrimmingandaligningtheusuallynon-horizontal
significant digits that generally should be retained. The proce-
shearsurfaceintheringshearapparatusisdifficult.Asaresult,
dures used do not consider material variation, purpose for
this test method focuses on the use of a reconstituted specimen
obtaining the data, special purpose studies, or any consider-
to determine the residual strength. An unlimited amount of
ations for the user’s objectives; and it is common practice to
continuous shear displacement can be achieved to obtain a
increase or reduce significant digits of reported data to be
residual strength condition in a ring shear device.
commensuratewiththeseconsiderations.Itisbeyondthescope
of this standard to consider significant digits used in analysis
1.5 A shear stress-displacement relationship may be ob-
methods for engineering design.
tained from this test method. However, a shear stress-strain
relationship or any associated quantity, such as modulus,
1.9 This standard does not purport to address all of the
cannot be determined from this test method because the height
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
1
priate safety, health, and environmental practices and deter-
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.05 on Strength and mine the applicability of regulatory limitations prior to use.
Compressibility of Soils.
1.10 This international standard was developed in accor-
Current edition approved Sept. 1, 2021. Published September 2021. Originally
ɛ1
dance with internationally recognized principles on standard-
approved in 1999. Last previous edition approved in 2013 as D6467–13 . DOI:
10.1520/D6467-21. ization established in the Decision on Principles for the
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohoc
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: D6467 − 13 D6467 − 21
Standard Test Method for
Torsional Ring Shear Test to Determine Drained Residual
1
Shear Strength of CohesiveFine-Grained Soils
This standard is issued under the fixed designation D6467; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Editorially updated units of measurement statement in April 2018.
1. Scope*
1.1 Fine-grained soils in this Test Method are restricted to soils containing no more than 15 % fine sand (100 % passing the 425 μm
(No. 40) sieve and no more than 15 % retained on the 75 μm (No. 200) sieve).
1.2 This test method provides a procedure for performing a torsional ring shear test under a drained condition to determine the
residual shear strength of fine-grained soils. This test method is performed by shearing a reconstituted, overconsolidated,
presheared specimen at a controlled displacement rate until the constant drained shear resistance is established on a single shear
surface determined by the configuration of the apparatus.
1.3 In this test, the specimen rotates in one direction until the constant or residual shear resistance is established. The amount of
rotation is converted to displacement using the average radius of the specimen and multiplying it by numbers of degrees traveled
and 0.0174.
1.4 This test method provides a procedure for performing a torsional ring shear test under a drained condition to determine the
residual shear strength of cohesive soils. An intact specimen An intact specimen or a specimen with a natural shear surface can
be used for testing. However, obtaining a natural slip surface specimen, determining the direction of field shearing, and trimming
and aligning the usually non-horizontal shear surface in the ring shear apparatus is difficult. As a result, this test method focuses
on the use of a reconstituted specimen to measuredetermine the residual strength. This test method is performed by deforming a
presheared, reconstituted specimen at a controlled displacement rate until the constant drained shear resistance is offered on a
single shear plane determined by the configuration of the apparatus. An unlimited amount of continuous shear displacement can
be achieved to obtain a residual strength condition. Generally, three or more normal stresses are applied to a test specimen to
determine the drained residual failure envelope. A separate test specimen may be used for each normal stress.condition in a ring
shear device.
1.5 A shear stress-displacement relationship may be obtained from this test method. However, a shear stress-strain relationship or
any associated quantity, such as modulus, cannot be determined from this test method because soil extrusion and volume change
prevents defining the height needed in the shear strain calculations. As a result, the height of the shear zone unknown, so an
accurate or representative shear strain cannot be calculated but shear displacement can be calculated.determined.
1.6 The selection of effective normal stresses and determination of the shear strength envelopeparameters for design analyses and
1
This test method is under the jurisdiction of ASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.05 on Strength and
Compressibility of Soils.
Current edition approved May 1, 2013Sept. 1, 2021. Published July 2013September 2021. Originally approved in 1999. Last previous edition approved in 20062013 as
ɛ1
D6467 – 06a.D6467 – 13 . DOI: 10.1520/D6467-13E01.10.1520/D6467-21.
*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
1
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D6467 − 21
the criteria to interpret and evaluate the test results are the responsibility of the engineerprofessional or office requesting the test.
Generally, three or more effective normal stresses are applied to a test specimen in a multi-stage test or a new specimen can be
used for each effective normal stress to determine the drained residual failure envelope.
1.7 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for
information only and are not considered standard. The values given in p
...
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