ASTM D2166-06

    Standard Test Method for Unconfined Compressive Strength of Cohesive Soil


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    1. Scope

    1.1 This test method covers the determination of the unconfined compressive strength of cohesive soil in the intact, remolded, or reconstituted condition, using strain-controlled application of the axial load.

    1.2 This test method provides an approximate value of the strength of cohesive soils in terms of total stresses.

    1.3 This test method is applicable only to cohesive materials which will not expel or bleed water (water expelled from the soil due to deformation or compaction) during the loading portion of the test and which will retain intrinsic strength after removal of confining pressures, such as clays or cemented soils. Dry and crumbly soils, fissured or varved materials, silts, peats, and sands cannot be tested with this method to obtain valid unconfined compression strength values.

    Note 1

    The determination of the unconsolidated, undrained strength of cohesive soils with lateral confinement is covered by Test Method D 2850.

    1.4 This test method is not a substitute for Test Method D 2850.

    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 procedures used to specify how data are collected/recorded and calculated in this test method are regarded as the industry standard. In addition, they are representative of the significant digits that should generally be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user's objectives; and it is common practice to increase or reduce significant digits of reported data to commensurate with these considerations. It is beyond the scope of this test method to consider significant digits used in analysis methods for engineering design.

    1.6 The values stated in SI units are to be regarded as the standard. The values stated in inch-pound units are approximate.

    This standard does not purport to address all of the safety problems, 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D653 Terminology Relating to Soil, Rock, and Contained Fluids

    D854 Test Methods for Specific Gravity of Soil Solids by Water Pycnometer

    D1587 Practice for Thin-Walled Tube Sampling of Soils for Geotechnical Purposes

    D2216 Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass

    D2488 Practice for Description and Identification of Soils (Visual-Manual Procedure)

    D2850 Test Method for Unconsolidated-Undrained Triaxial Compression Test on Cohesive Soils

    D3740 Practice for Minimum Requirements for Agencies Engaged in Testing and/or Inspection of Soil and Rock as Used in Engineering Design and Construction

    D4220 Practices for Preserving and Transporting Soil Samples

    D4318 Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils

    D6026 Practice for Using Significant Digits in Geotechnical Data

    D6913 Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    ICS Code

    ICS Number Code 93.020 (Earth works. Excavations. Foundation construction. Underground works)

    Referencing This Standard
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    DOI: 10.1520/D2166-06

    Citation Format

    ASTM D2166-06, Standard Test Method for Unconfined Compressive Strength of Cohesive Soil, ASTM International, West Conshohocken, PA, 2006, www.astm.org

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