True Triaxial Test
Geotechdata.info - Updated 22.10.2016
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The true triaxial apparatus is a laboratory testing equipment to study the three dimensional stress-strain-strength behavior of soil, for instance in complex stress paths. It is mainly considered as a research laboratory tool for advanced study of mechanical behavior of soil. It the recent years, however, it has been also considered in geotechnical engineering practice.
It allows independent control of normal stresses applied in three dimensions to cubical soil samples. The term “true” is used to avoid confusion with conventional triaxial apparatus in which stresses are controlled only along two axes, i.e. axial and lateral confining stresses. The ability of independent control of the parameters in three dimensions, allows for a wider range of loading condition in a true triaxial test. Three general types of true triaxial apparatus are:
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