Geocomp > Products for Geotechnical Testing > Large Direct / Residual Shear Test System
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Strength Testing

Large Direct / Residual Shear Test System

The ShearTrac III system is capable of performing the consolidation and shearing phases of a 305 x 305 x 205 mm (12 x 12 x 8 in) direct or residual shear test on soil/aggregate under fully automated control with convenient monitoring and instant test results. It consists of a computer-controlled unit using independent, electromechanical micro-stepper systems to apply the vertical and horizontal loads to soil specimens.

With its high load capacity, broad range of testing flexibility, and overall ease of use the ShearTrac III is the preferred large shear machine on the market.

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The direct shear test method is used to quickly determine the consolidated, drained shear strength properties of soil. Any type of soil material can be tested. In this test, the specimen is sheared at a specified rate along a single plane within a shear box. Residual shear measures the minimum strength of a soil.

One common application is embankment projects, but overall the test can be used to determine the stability of slopes or cuts, bearing capacity of foundations, or calculating pressure exerted by a soil on a retaining wall.
Lab Photo

Frequently Asked Questions

Yes! Geocomp offers a special rock jig and ring sets that are used in the system for testing rock samples. The ring sets allow you to mold samples up to 152 mm (6.0 in) in diameter.