The first paper provides an introduction to the triaxial test, explaining why the test is performed, the stress state of a tested soil, required test system components, and the general procedure for running a triaxial test. It assumes a basic knowledge of soil mechanics – for those readers unfamiliar with some terms in this paper, it is recommended they revisit Part One of the GDS Introduction to Soil & Rock Testing series, which briefly covers the key terminology and engineering parameters discussed herein.
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