ASTM D4767-11
(Test Method)Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils
Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils
SIGNIFICANCE AND USE
The shear strength of a saturated soil in triaxial compression depends on the stresses applied, time of consolidation, strain rate, and the stress history experienced by the soil.
In this test method, the shear characteristics are measured under undrained conditions and is applicable to field conditions where soils that have been fully consolidated under one set of stresses are subjected to a change in stress without time for further consolidation to take place (undrained condition), and the field stress conditions are similar to those in the test method.
Note 1—If the strength is required for the case where the soil is not consolidated during testing prior to shear, refer to Test Method D2850 or Test Method D2166.
Using the pore-water pressure measured during the test, the shear strength determined from this test method can be expressed in terms of effective stress. This shear strength may be applied to field conditions where full drainage can occur (drained conditions) or where pore pressures induced by loading can be estimated, and the field stress conditions are similar to those in the test method.
The shear strength determined from the test expressed in terms of total stresses (undrained conditions) or effective stresses (drained conditions) is commonly used in embankment stability analyses, earth pressure calculations, and foundation design.
Note 2—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 which 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 covers the determination of strength and stress-strain relationships of a cylindrical specimen of either an intact, reconstituted, or remolded saturated cohesive soil. Specimens are isotropically consolidated and sheared in compression without drainage at a constant rate of axial deformation (strain controlled).
1.2 This test method provides for the calculation of total and effective stresses, and axial compression by measurement of axial load, axial deformation, and pore-water pressure.
1.3 This test method provides data useful in determining strength and deformation properties of cohesive soils such as Mohr strength envelopes and Young's modulus. Generally, three specimens are tested at different effective consolidation stresses to define a strength envelope.
1.4 The determination of strength envelopes and the development of relationships to aid in interpreting and evaluating test results are beyond the scope of this test method and must be performed by a qualified, experienced professional.
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.
1.5.1 The methods used to specify how data are collected, calculated, or recorded in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies or any consideration of end use. It is beyond the scope of this test method to consider significant digits used in analysis methods for engineering design.
1.6 Units—The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are mathematical conversions which are provided for information purposes only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance wit...
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Designation: D4767 − 11
Standard Test Method for
Consolidated Undrained Triaxial Compression Test for
1
Cohesive Soils
This standard is issued under the fixed designation D4767; 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* purposes only and are not considered standard. Reporting of
test results in units other than SI shall not be regarded as
1.1 This test method covers the determination of strength
nonconformance with this test method.
and stress-strain relationships of a cylindrical specimen of
1.6.1 The gravitational system of inch-pound units is used
either an intact, reconstituted, or remolded saturated cohesive
when dealing with inch-pound units. In this system, the pound
soil. Specimens are isotropically consolidated and sheared in
(lbf)representsaunitofforce(weight),whiletheunitformass
compression without drainage at a constant rate of axial
is slugs. The slug unit is not given, unless dynamic (F = ma)
deformation (strain controlled).
calculations are involved.
1.2 Thistestmethodprovidesforthecalculationoftotaland
1.6.2 It is common practice in the engineering/construction
effective stresses, and axial compression by measurement of
profession to concurrently use pounds to represent both a unit
axial load, axial deformation, and pore-water pressure.
of mass (lbm) and of force (lbf). This implicitly combines two
separate systems of units; that is, the absolute system and the
1.3 This test method provides data useful in determining
strength and deformation properties of cohesive soils such as gravitational system. It is scientifically undesirable to combine
the use of two separate sets of inch-pound units within a single
Mohr strength envelopes and Young’s modulus. Generally,
three specimens are tested at different effective consolidation standard. As stated, this standard includes the gravitational
system of inch-pound units and does not use/present the slug
stresses to define a strength envelope.
unitformass.However,theuseofbalancesorscalesrecording
1.4 The determination of strength envelopes and the devel-
3
pounds of mass (lbm) or recording density in lbm/ft shall not
opment of relationships to aid in interpreting and evaluating
be regarded as nonconformance with this standard.
test results are beyond the scope of this test method and must
1.6.3 The terms density and unit weight are often used
be performed by a qualified, experienced professional.
interchangeably. Density is mass per unit volume whereas unit
1.5 All observed and calculated values shall conform to the
weight is force per unit volume. In this standard density is
guidelines for significant digits and rounding established in
given only in SI units. After the density has been determined,
Practice D6026.
the unit weight is calculated in SI or inch-pound units, or both.
1.5.1 The methods used to specify how data are collected,
1.7 This standard does not purport to address all of the
calculated, or recorded in this standard are regarded as the
safety concerns, if any, associated with its use. It is the
industry standard. In addition, they are representative of the
responsibility of the user of this standard to establish appro-
significant digits that generally should be retained. The proce-
priate safety and health practices and determine the applica-
dures used do not consider material variation, purpose for
bility of regulatory limitations prior to use.
obtainingthedata,specialpurposestudiesoranyconsideration
of end use. It is beyond the scope of this test method to
2. Referenced Documents
consider significant digits used in analysis methods for engi-
2
2.1 ASTM Standards:
neering design.
D422Test Method for Particle-Size Analysis of Soils
1.6 Units—The values stated in SI units are to be regarded
D653Terminology Relating to Soil, Rock, and Contained
as standard. The inch-pound units given in parentheses are
Fluids
mathematical conversions which are provided for information
D854Test Methods for Specific Gravity of Soil Solids by
Water Pycnometer
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
Current edition approved Jan. 15, 2011. Published February 2011. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1988. Last previou edition approved in 2004 as D4767–04. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D4767-11. the ASTM website.
*A Summar
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D4767–04 Designation:D4767–11
Standard Test Method for
Consolidated Undrained Triaxial Compression Test for
1
Cohesive Soils
This standard is issued under the fixed designation D4767; 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*
1.1 This test method covers the determination of strength and stress-strain relationships of a cylindrical specimen of either an
undisturbedintact, reconstituted, or remolded saturated cohesive soil. Specimens are isotropically consolidated and sheared in
compression without drainage at a constant rate of axial deformation (strain controlled).
1.2 This test method provides for the calculation of total and effective stresses, and axial compression by measurement of axial
load, axial deformation, and pore-water pressure.
1.3 This test method provides data useful in determining strength and deformation properties of cohesive soils such as Mohr
strength envelopes and Young’s modulus. Generally, three specimens are tested at different effective consolidation stresses to
define a strength envelope.
1.4 The determination of strength envelopes and the development of relationships to aid in interpreting and evaluating test
results are beyond the scope of this test method and must be performed by a qualified, experienced professional.
1.5All1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in
Practice D6026.
1.5.1The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the
accuracytowhichthedatacanbeappliedindesignorotheruses,orboth.Howoneappliestheresultsobtainedusingthisstandard
is beyond its scope.
1.6The values stated in SI units shall be regarded as the standard. The values stated in inch-pound units are approximate.
1.5.1 The methods used to specify how data are collected, calculated, or recorded in this standard are regarded as the industry
standard.Inaddition,theyarerepresentativeofthesignificantdigitsthatgenerallyshouldberetained.Theproceduresuseddonot
consider material variation, purpose for obtaining the data, special purpose studies or any consideration of end use. It is beyond
the scope of this test method to consider significant digits used in analysis methods for engineering design.
1.6 Units—The values stated in SI units are to be regarded as standard. The inch-pound units given in parentheses are
mathematical conversions which are provided for information purposes only and are not considered standard. Reporting of test
results in units other than SI shall not be regarded as nonconformance with this test method.
1.6.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf)
representsaunitofforce(weight),whiletheunitformassisslugs.Theslugunitisnotgiven,unlessdynamic(F=ma)calculations
are involved.
1.6.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of
mass (lbm) and of force (lbf). This implicitly combines two separate systems of units; that is, the absolute system and the
gravitational system. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single
standard.As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit for
3
mass. However, the use of balances or scales recording pounds of mass (lbm) or recording density in lbm/ft shall not be regarded
as nonconformance with this standard.
1.6.3 The terms density and unit weight are often used interchangeably. Density is mass per unit volume whereas unit weight
is force per unit volume. In this standard density is given only in SI units.After the density has been determined, the unit weight
is calculated in SI or inch-pound units, or both.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
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 Nov. 1, 2004. Published December 2004. Originally approved in 1988. Last previou edition appr
...
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