• ASTM D 7181 : 2020

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    Standard Test Method for Consolidated Drained Triaxial Compression Test for Soils

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  02-01-2020

    Publisher:  American Society for Testing and Materials

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    Scope - (Show below) - (Hide below)

    1.1This test method covers the determination of strength and stress-strain relationships of a cylindrical specimen of either intact or reconstituted soil. Specimens are consolidated and sheared in compression with drainage at a constant rate of axial deformation (strain controlled).

    1.2This test method provides for the calculation of principal stresses and axial compression by measurement of axial load, axial deformation, and volumetric changes.

    1.3This test method provides data useful in determining strength and deformation properties such as Mohr strength envelopes. Generally, three specimens are tested at different effective consolidation stresses to define a strength envelope. The stresses should be specified by the engineer requesting the test. A test on a new specimen is required for each consolidation stress.

    1.4If this test method is used on cohesive soil, a test may take weeks to complete.

    1.5The 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.

    1.6All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.

    1.6.1The procedures 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 variations, purpose for obtaining the data, special purpose studies or any consideration for the user’s objectives; and it is common practice to increase or reduce the significant digits of the reported data to be commensurate with these considerations. It is beyond the scope of this test standard to consider significant digits used in analysis methods for engineering design.

    1.7Units—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 non-conformance with this test method.

    1.7.1The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. The slug unit is not given, unless dynamic (F = ma) calculations are involved.

    1.7.2It 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 mass. However, the use of balances or scales recording pounds of mass (lbm) or recording density in lbm/ft3 shall not be regarded as non-conformance with this standard.

    1.7.3The 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.

    1.8This standard may involve hazardous materials, operations, and equipment. 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 and determine the applicability of regulatory limitations prior to use.

    1.9This 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.

    General Product Information - (Show below) - (Hide below)

    Committee D 18
    Document Type Test Method
    Publisher American Society for Testing and Materials
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    ASTM D 4015 : 2015 : EDT 1 Standard Test Methods for Modulus and Damping of Soils by Fixed-Base Resonant Column Devices
    ASTM E 2277 : 2014(R2019) Standard Guide for Design and Construction of Coal Ash Structural Fills

    Standards Referencing This Book - (Show below) - (Hide below)

    ASTM D 2487 : 2017 : EDT 1 Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)
    ASTM D 653 : 2007 Standard Terminology Relating to Soil, Rock, and Contained Fluids
    ASTM D 7928 : 2021 : EDT 1 Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis
    ASTM D 4767 : 2011 : R2020 Standard Test Method for Consolidated Undrained Triaxial Compression Test for Cohesive Soils
    ASTM D 6026 : 2013 Standard Practice for Using Significant Digits in Geotechnical Data
    ASTM D 7928 : 2017 Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis
    ASTM D 653 : 2022 Standard Terminology Relating to Soil, Rock, and Contained Fluids
    ASTM D 4753 : 1995 Standard Specification for Evaluating, Selecting, and Specifying Balances and Scales for Use in Soil, Rock, and Construction Materials Testing
    ASTM D 653 : 2020 : EDT 1 Standard Terminology Relating to Soil, Rock, and Contained Fluids
    ASTM D 653 : 2021 : REV A Standard Terminology Relating to Soil, Rock, and Contained Fluids
    ASTM D 653 : 2021 Standard Terminology Relating to Soil, Rock, and Contained Fluids
    ASTM D 653 : 2021 : REV B Standard Terminology Relating to Soil, Rock, and Contained Fluids
    ASTM D 7928 : 2021 Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis
    ASTM D 6026 : 1996 : EDT 1 Standard Practice for Using Significant Digits in Geotechnical Data
    ASTM D 6026 : 2021 Standard Practice for Using Significant Digits and Data Records in Geotechnical Data
    ASTM D 2487 : 2017 Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System)
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