ASTM D6467-13
(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 are mathematical conversions to inch-pound units that 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 and...
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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. 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 and health practices and determine the applica-
and trimming and aligning the usually non-horizontal shear
bility of regulatory limitations prior to use.
surface in the ring shear apparatus is difficult.As a result, this
test method focuses on the use of a reconstituted specimen to
2. Referenced Documents
measuretheresidualstrength.Thistestmethodisperformedby
2
deforming a presheared, reconstituted specimen at a controlled
2.1 ASTM Standards:
displacement rate until the constant drained shear resistance is
D422Test Method for Particle-Size Analysis of Soils
offeredonasingleshearplanedeterminedbytheconfiguration
D653Terminology Relating to Soil, Rock, and Contained
of the apparatus. An unlimited amount of continuous shear
Fluids
displacement can be achieved to obtain a residual strength
D854Test Methods for Specific Gravity of Soil Solids by
condition. Generally, three or more normal stresses are applied
Water Pycnometer
to a test specimen to determine the drained residual failure
D2216Test Methods for Laboratory Determination ofWater
envelope. A separate test specimen may be used for each
(Moisture) Content of Soil and Rock by Mass
normal stress.
D2435Test Methods for One-Dimensional Consolidation
Properties of Soils Using Incremental Loading
1.2 A shear stress-displacement relationship may be ob-
D2487Practice for Classification of Soils for Engineering
tained from this test method. However, a shear stress-strain
Purposes (Unified Soil Classification System)
relationship or any associated quantity, such as modulus,
D3080Test Method for Direct Shear Test of Soils Under
cannot be determined from this test method because soil
Consolidated Drained Conditions
extrusion and volume change prevents defining the height
D3740Practice for Minimum Requirements for Agencies
needed in the shear strain calculations.As a result, shear strain
Engaged in Testing and/or Inspection of Soil and Rock as
cannot be calculated but shear displacement can be calculated.
Used in Engineering Design and Construction
1.3 The selection of normal stresses and determination of
D4318Test Methods for Liquid Limit, Plastic Limit, and
the shear strength envelope for design analyses and the criteria
Plasticity Index of Soils
tointerpretandevaluatethetestresultsaretheresponsibilityof
D6026Practice for Using Significant Digits in Geotechnical
the engineer or office requesting the test.
Data
1.4 The values stated in SI units are to be regarded as
standard. The values given in parentheses are mathematical 3. Terminology
conversions to inch-pound units that are provided for informa-
3.1 Definitions—For definitions of terms used in this test
tion only and are not considered standard.
method, refer to Terminology D653.
3.2 Definitions of Terms Specific to This Standard:
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.05 on Strength and
2
Compressibility of Soils. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedMay1,2013.PublishedJuly2013.Originallyapproved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 1999. Last previous edition approved in 2006 as D6467–06a. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
D6467-13. the ASTM website.
*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 − 13
not ensure reliable testing. Reliable testing depends on several factors;
3.2.1 consolidated—soi
...
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.
Designation: D6467 − 06a 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. 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 undisturbedintact specimen can be used for testing. However, obtaining a natural slip
surface specimen, determining the direction of field shearing, and trimming and properly 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 minimum 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 possible 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 final 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 the standard. The values stated in inch-pound units are approximated.
given in parentheses are mathematical conversions to inch-pound units that 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D422 Test Method for Particle-Size Analysis of Soils
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
D2435 Test Methods for One-Dimensional Consolidation Properties of Soils Using Incremental Loading
D2487 Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)
D3080 Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions
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, 2006May 1, 2013. Published June 2006July 2013. Originally approved in 1999. Last previous edition approved in 2006 as
D6467 – 06.D6467 – 06a. DOI: 10.1520/D6467-06A.10.1520/D6467-13.
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.
*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
---------------------- Page: 1 ----------------------
D6467 − 13
D3740 Practice for Minimum Requirements for Agencies Engaged in
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