5/4/2023 0 Comments Direct shear test intact rock![]() In the direct simple shear (DSS) test the sample is uniformly deformed without the forming of a single shearing surface (see Figure 2) the sample should shear at its weakest point. The Direct Simple Shear (DSS) test was designed to overcome this limitation of the direct shear test. When shearing a sample in a direct shear apparatus the sample will be forced to shear in the centre of a sample (See Figure 1) this may not be its weakest point, and thus the test may overestimate the shear strength. The test is common due to its relative simplicity. One of the most common tests within a geotechnical laboratory is the Direct Shear test it is used to determine the shear strength parameters cohesion (C) and internal angle of friction ( φ ) of soil. It is recommended that this support document is read in conjunction with the glossary of terms that can be found in the support section of VJ Tech’s website, which can be found here. The paper will look at the differing standard systems that are available for this test, some of the theory and will look at the advantages VJ Tech equipment and software can offer. ![]() ![]() This includes why the test is performed and how it is performed. This support document is designed to give a brief introduction to the theory of Direct Simple Shear (or DSS) testing for a technician or engineer new to this test. Introduction to Direct Simple Shear Testing ![]()
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