ASTM D6467-21e1
(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...
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
´1
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
ε NOTE—The standard was editorially updated in January 2022.
1. Scope* 1.6 The selection of effective normal stresses and determi-
nation of the shear strength parameters for design analyses are
1.1 Fine-grained soils in this Test Method are restricted to
the responsibility of the professional or office requesting the
soils containing no more than 15% fine sand (100% passing
test. Generally, three or more effective normal stresses are
the 425µm (No. 40) sieve and no more than 15% retained on
applied to a test specimen in a multi-stage test or a new
the 75µm (No. 200) sieve).
specimen can be used for each effective normal stress to
1.2 This test method provides a procedure for performing a
determine the drained residual failure envelope.
torsional ring shear test under a drained condition to determine
the residual shear strength of fine-grained soils. This test
1.7 The values stated in SI units are to be regarded as
method is performed by shearing a reconstituted,
standard. The values given in parentheses are provided for
overconsolidated, presheared specimen at a controlled dis-
information only and are not considered standard. The values
placement rate until the constant drained shear resistance is
given in parentheses are mathematical conversions to inch-
established on a single shear surface determined by the
pound units. Reporting of test results in units other than SI
configuration of the apparatus.
shall not be regarded as nonconformance with this standard.
1.3 In this test, the specimen rotates in one direction until
1.8 All measured and calculated values shall conform to the
the constant or residual shear resistance is established. The
guidelines for significant digits and rounding established in
amount of rotation is converted to displacement using the
Practice D6026 unless superseded by this standard.
average radius of the specimen and multiplying it by numbers
1.8.1 Theproceduresusedtospecifyhowdataarecollected/
of degrees traveled and 0.0174.
recorded or calculated in the standard are regarded as the
1.4 An intact specimen or a specimen with a natural shear
industry standard. In addition, they are representative of the
surface can be used for testing. However, obtaining a natural
significant digits that generally should be retained. The proce-
slip surface specimen, determining the direction of field
dures used do not consider material variation, purpose for
shearing,andtrimmingandaligningtheusuallynon-horizontal
obtaining the data, special purpose studies, or any consider-
shearsurfaceintheringshearapparatusisdifficult.Asaresult,
ations for the user’s objectives; and it is common practice to
this test method focuses on the use of a reconstituted specimen
increase or reduce significant digits of reported data to be
to determine the residual strength. An unlimited amount of
commensuratewiththeseconsiderations.Itisbeyondthescope
continuous shear displacement can be achieved to obtain a
of this standard to consider significant digits used in analysis
residual strength condition in a ring shear device.
methods for engineering design.
1.5 A shear stress-displacement relationship may be ob-
1.9 This standard does not purport to address all of the
tained from this test method. However, a shear stress-strain
safety concerns, if any, associated with its use. It is the
relationship or any associated quantity, such as modulus,
cannot be determined from this test method because the height responsibility of the user of this standard to establish appro-
of the shear zone unknown, so an accurate or representative priate safety, health, and environmental practices and deter-
shear strain cannot be determined.
mine the applicability of regulatory limitations prior to use.
1.10 This international standard was developed in accor-
1 dance with internationally recognized principles on standard-
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.05 on Strength and ization established in the Decision on Principles for the
Compressibility of Soils.
Development of International Standards, Guides and Recom-
Current edition approved Sept. 1, 2021. P
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.