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Triaxial apparatus with sample attached ready for testing. In materials science, a triaxial shear test is a common method to measure the mechanical properties of many deformable solids, especially soil (e.g., sand, clay) and rock, and other granular materials or powders. There are several variations on the test.
In the case of convex critical surface, with the aid of any type of biaxial (plane) stress test, for any fixed value of skewness (Lode) angle =, critical effective stresses can be determined for only three values of mean stress (pressure) =, and thus three values of triaxiality factor = corresponding to in three subdomains.
In 1958 a study of the yielding of soil based on some Cambridge data of the simple shear apparatus tests, and on much more extensive data of triaxial tests at Imperial College London from research led by Professor Sir Alec Skempton at Imperial College, led to the publication of the critical state concept (Roscoe, Schofield & Wroth 1958).
A typical reference strain for the approximate occurrence of zero effective stress is 5% double amplitude shear strain. This is a soil test-based definition, usually performed via cyclic triaxial, cyclic direct simple shear, or cyclic torsional shear type apparatus. These tests are performed to determine a soil's resistance to liquefaction by ...
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Triaxial shear test This page was last edited on 5 December 2019, at 11:10 (UTC). Text is available under the Creative Commons Attribution ...
[citation needed] He was also a pioneer in the US for conducting the triaxial shear test and was one of the first persons to study the volume changes of soil during shear. Aided by his latest advances in experimental techniques and apparatus, Casagrande was able to make fundamental contributions to the understanding of soil mechanics.
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