ASTM D4767-04
(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 D 2850 or Test Method D 2166.
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 D 3740 are generally considered capable of competent testing. Users of this test method are cautioned that compliance with Practice D 3740 does not ensure reliable testing. Reliable testing depends on several factors; Practice D 3740 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 undisturbed 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 D 6026.
1.5.1 The method used to specify how data are collected, calculated, or recorded in this standard is not directly related to the accuracy to which the data can be applied in design or other uses, or both. How one applies the results obtained using this standard is beyond its scope.
1.6 The values stated in SI units shall be regarded as the standard. The values stated in inch-pound units are approximate.
1.7 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.
General Information
Relations
Standards Content (Sample)
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Designation:D4767–04
Standard Test Method for
Consolidated Undrained Triaxial Compression Test for
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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* 2. Referenced Documents
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1.1 This test method covers the determination of strength 2.1 ASTM Standards:
and stress-strain relationships of a cylindrical specimen of D422 Test Method for Particle-Size Analysis of Soils
either an undisturbed or remolded saturated cohesive soil. D653 Terminology Relating to Soil, Rock, and Contained
Specimens are isotropically consolidated and sheared in com- Fluids
pression without drainage at a constant rate of axial deforma- D854 Test Methods for Specific Gravity of Soil Solids by
tion (strain controlled). Water Pycnometer
1.2 Thistestmethodprovidesforthecalculationoftotaland D1587 PracticeforThin-WalledTubeSamplingofSoilsfor
effective stresses, and axial compression by measurement of Geotechnical Purposes
axial load, axial deformation, and pore-water pressure. D2166 Test Method for Unconfined Compressive Strength
1.3 This test method provides data useful in determining of Cohesive Soil
strength and deformation properties of cohesive soils such as D2216 Test Methods for Laboratory Determination of Wa-
Mohr strength envelopes and Young’s modulus. Generally, ter (Moisture) Content of Soil and Rock by Mass
three specimens are tested at different effective consolidation D2435 Test Methods for One-Dimensional Consolidation
stresses to define a strength envelope. Properties of Soils Using Incremental Loading
1.4 The determination of strength envelopes and the devel- D2850 Test Method for Unconsolidated-Undrained Triaxial
opment of relationships to aid in interpreting and evaluating Compression Test on Cohesive Soils
test results are beyond the scope of this test method and must D3740 Practice for Minimum Requirements for Agencies
be performed by a qualified, experienced professional. Engaged in Testing and/or Inspection of Soil and Rock as
1.5 All observed and calculated values shall conform to the Used in Engineering Design and Construction
guidelines for significant digits and rounding established in D4220 Practices for Preserving and Transporting Soil
Practice D6026. Samples
1.5.1 The method used to specify how data are collected, D4318 Test Methods for Liquid Limit, Plastic Limit, and
calculated,orrecordedinthisstandardisnotdirectlyrelatedto Plasticity Index of Soils
theaccuracytowhichthedatacanbeappliedindesignorother D4753 Guide for Evaluating, Selecting, and Specifying
uses, or both. How one applies the results obtained using this Balances and Standard Masses for Use in Soil, Rock, and
standard is beyond its scope. Construction Materials Testing
1.6 The values stated in SI units shall be regarded as the D6026 PracticeforUsingSignificantDigitsinGeotechnical
standard. The values stated in inch-pound units are approxi- Data
mate.
3. Terminology
1.7 This standard does not purport to address all of the
3.1 Definitions—The definitions of terms used in this test
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- method shall be in accordance with Terminology D653.
3.2 Definitions of Terms Specific to This Standard:
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 3.2.1 back pressure—a pressure applied to the specimen
pore-water to cause air in the pore space to compress and to
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ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
Rock and is the direct responsibility of Subcommittee D18.05 on Strength and
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Compressibility of Soils. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2004. Published December 2004. Originally 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
approved in 1988. Last previou edition approved in 2002 as D4767–02. DOI:
10.1520/D4767-04. 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.
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D4767–04
pass into solution in the pore-water thereby increasing the expressed in terms of effective stress. This shear strength may
percent saturation of the specimen. be applied to field conditions where full drainage can occur
3.2.2 effecti
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