Interface Shear Instructions: ASTM D OR. ASTM D 1. Test Type. Isolated Interface. Multiple Interfaces (“floating”) – skip to “3” below. 2. Shear Plane. ASTM D/DM: Standard Test Method for Determining the Shear Strength of Soil-Geosynthetic and Geosynthetic-Geosynthetic Interfaces by Direct . ASTM D/DM Standard Test Method for Determining the Shear Strength of Soil-Geosynthetic and Geosynthetic-Geosynthetic.

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The peak and post-peak shear stresses are plotted against the applied normal stresses. A shear force is applied to the apparatus such that one section of the box is moved in relation to the other.

Shear resistance between a geosynthetic and a soil, or a geosynthetic and another geosynthetic is measured. Care should be taken, including close visual inspection of the specimen after testing, to ensure that the testing conditions are representative of those being investigated. The test data are presented by a best fit straight line whose slope is the coefficient of friction between the two materials where the shearing occurred.

Every effort should be made to identify, as closely as practicable, the sheared area and failure mode of asmt specimen.

Testing under this test method should be performed by laboratories qualified in the direct shear testing of soils and meeting the requirements of Practice Despecially since the test results may depend on site-specific and test conditions. The geosynthetic and other material is placed within a large-scale direct shear box with an applied normal load on top. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.


The method of axtm data interpretation for purposes of acceptance should be mutually agreed to by the users of this test method.

The shear force is recorded with respect to displacement. The total shear resistance may be a combination of sliding, rolling, and interlocking of material components.


Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Geosynthetic testing Lab Services: Request Quote Client Login. The test specimens and conditions, including normal stresses, are generally selected by the user. The y-intercept of the straight line is the adhesion. Geosynthetic testing Back to Results Print.

ASTM D Archives | Geosynthetica: Geosynthetics Engineering

Link to Active This link will always route to the current Active version of the standard. For more information, contact: 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.

Combining values from the two systems may result in nonconformance with the standard. For Individuals with needing special assistance for disabilities or limited English proficiency Please contact our Title VI specialist at In the case of acceptance testing requiring the use of soil, the user must furnish the soil sample, soil parameters, and direct shear test parameters. sstm


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The determined value may be a function of the applied normal stress, material characteristics for example, of the geosyntheticsoil properties, size of sample, moisture content, drainage conditions, displacement rate, magnitude of displacement, and other parameters. In cases of dispute, comparative tests to determine whether a statistical bias exists among laboratories may be advisable.

Results obtained from this method may be limited in their applicability to the specific conditions considered in the testing. Historical Version s – view previous versions of standard.

The wstm loads used typically at least three normally represent design conditions. The user of results from this test method is cautioned that results at a specified displacement may not be reproducible across laboratories and that the relative shear displacement measured in this test at peak strength may not match relative shear displacement at peak strength in a field condition.