ASTM D6467-13e1
(Test Method)Standard Test Method for Torsional Ring Shear Test to Determine Drained Residual Shear Strength of Cohesive Soils
Standard Test Method for Torsional Ring Shear Test to Determine Drained Residual Shear Strength of Cohesive 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, and the capability of testing one specimen under different normal stresses to quickly obtain a shear strength envelope.
5.2 The test results are primarily applicable to assess the shear strength in slopes that contain a preexisting shear surface, such as old landslides, soliflucted slopes, and sheared bedding planes, joints, or faults.
5.3 The apparatus allows a reconstituted specimen to be overconsolidated and presheared prior to drained shearing. This simulates the field conditions that lead to a preexisting shear surface along which the drained residual strength can be mobilized.
5.4 The ring shear device keeps the cross-sectional area of the shear surface constant during shear and shears the specimen continuously in one rotational direction for any magnitude of displacement. This allows clay particles to become oriented parallel to the direction of shear and a residual strength condition to develop.
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 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 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 measure 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.
1.2 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, shear strain cannot be calculated but shear displacement can be calculated.
1.3 The selection of normal stresses and determination of the shear strength envelope for design analyses and the criteria to interpret and evaluate the test results are the responsibility of the engineer or office requesting the test.
1.4 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.
1.5 All measured and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices a...
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´1
Designation: D6467 − 13
Standard Test Method for
Torsional Ring Shear Test to Determine Drained Residual
1
Shear Strength of Cohesive 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—Editorially updated units of measurement statement in April 2018.
1. Scope* 1.5 All measured and calculated values shall conform to the
guidelines for significant digits and rounding established in
1.1 This test method provides a procedure for performing a
Practice D6026.
torsional ring shear test under a drained condition to determine
1.6 This standard does not purport to address all of the
the residual shear strength of cohesive soils. An intact speci-
safety concerns, if any, associated with its use. It is the
men can be used for testing. However, obtaining a natural slip
responsibility of the user of this standard to establish appro-
surface specimen, determining the direction of field shearing,
priate safety, health, and environmental practices and deter-
and trimming and aligning the usually non-horizontal shear
mine the applicability of regulatory limitations prior to use.
surface in the ring shear apparatus is difficult.As a result, this
1.7 This international standard was developed in accor-
test method focuses on the use of a reconstituted specimen to
dance with internationally recognized principles on standard-
measuretheresidualstrength.Thistestmethodisperformedby
ization established in the Decision on Principles for the
deforming a presheared, reconstituted specimen at a controlled
Development of International Standards, Guides and Recom-
displacement rate until the constant drained shear resistance is
mendations issued by the World Trade Organization Technical
offeredonasingleshearplanedeterminedbytheconfiguration
Barriers to Trade (TBT) Committee.
of the apparatus. An unlimited amount of continuous shear
displacement can be achieved to obtain a residual strength
2. Referenced Documents
condition. Generally, three or more normal stresses are applied
2
to a test specimen to determine the drained residual failure
2.1 ASTM Standards:
envelope. A separate test specimen may be used for each
D422Test Method for Particle-SizeAnalysis of Soils (With-
3
normal stress.
drawn 2016)
D653Terminology Relating to Soil, Rock, and Contained
1.2 A shear stress-displacement relationship may be ob-
Fluids
tained from this test method. However, a shear stress-strain
D854Test Methods for Specific Gravity of Soil Solids by
relationship or any associated quantity, such as modulus,
Water Pycnometer
cannot be determined from this test method because soil
D2216Test Methods for Laboratory Determination ofWater
extrusion and volume change prevents defining the height
(Moisture) Content of Soil and Rock by Mass
needed in the shear strain calculations.As a result, shear strain
D2435Test Methods for One-Dimensional Consolidation
cannot be calculated but shear displacement can be calculated.
Properties of Soils Using Incremental Loading
1.3 The selection of normal stresses and determination of
D2487Practice for Classification of Soils for Engineering
the shear strength envelope for design analyses and the criteria
Purposes (Unified Soil Classification System)
tointerpretandevaluatethetestresultsaretheresponsibilityof
D3080Test Method for Direct Shear Test of Soils Under
the engineer or office requesting the test.
Consolidated Drained Conditions
1.4 The values stated in SI units are to be regarded as
D3740Practice for Minimum Requirements for Agencies
standard. The values given in parentheses after SI units are Engaged in Testing and/or Inspection of Soil and Rock as
provided for information only and are not considered standard.
Used in Engineering Design and Construction
1 2
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Rock and is the direct responsibility of Subcommittee D18.05 on Strength and contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Compressibility of Soils. Standards volume information, refer to the standard’s Document Summary page on
CurrenteditionapprovedMay1,2013.PublishedJuly2013.Originallyapproved the ASTM website.
3
in 1999. Last previous edition approved in 2006 as D6467–06a. DOI: 10.1520/ The last approved version of this historical standard is referenced on
D6467-13E01. www.astm.org.
*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 19
...
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 − 13
Standard Test Method for
Torsional Ring Shear Test to Determine Drained Residual
1
Shear Strength of Cohesive 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 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 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 measure 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.
1.2 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, shear strain cannot be calculated but shear
displacement can be calculated.
1.3 The selection of normal stresses and determination of the shear strength envelope for design analyses and the criteria to
interpret and evaluate the test results are the responsibility of the engineer or office requesting the test.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions
to inch-pound units that after SI units are provided for information only and are not considered standard.
1.5 All measured and calculated values shall conform to the guidelines for significant digits and rounding established in Practice
D6026.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 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.
2. Referenced Documents
2
2.1 ASTM Standards:
3
D422 Test Method for Particle-Size Analysis of Soils (Withdrawn 2016)
D653 Terminology Relating to Soil, Rock, and Contained Fluids
D854 Test Methods for Specific Gravity of Soil Solids by Water Pycnometer
D2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass
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, 2013. Published July 2013. Originally approved in 1999. Last previous edition approved in 2006 as D6467 – 06a. DOI:
10.1520/D6467-13.10.1520/D6467-13E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
*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
...
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