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Strength Testing

Direct / Residual Shear Test System

The ShearTrac II system performs the consolidation and shearing phases of a direct shear or residual shear test under fully automated control with convenient monitoring and instant test results. It consists of a computer-controlled unit using independent, electro-mechanical micro-stepper systems to apply the vertical and horizontal loads to soil specimens.

The rigid vertical frame is also ideal to perform consolidation (incremental or CRC/CRS) or unconfined compressive strength tests. Combined with the ability to easily upgrade the system to perform direct simple shear testing makes the ShearTrac II the most versatile shear frame available.

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Description

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