• Provides failure envelope and mechanical properties under different confining stress from a single sample due to core material shortage.
  • Test results provide more consistent strength data by eliminating sample variability for the construction of failure envelope.
  • The sample is subjected to triaxial loading and unloading before failure at increasingly higher confining stresses except in the last triaxial loading cycle in which the sample is loaded to failure.
  • A conservative estimate of the failure envelope can be made from the unload points of the triaxial loading cycles.
  • Criteria for unloading can be decided prior to testing (point of positive dilatancy or approaching failure) depending on program requirements.

Recommended Sample Dimensions:

  • Length: 3” Diamter:1.5”
  • Length: 2” Diamter:1”