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The friction angle φ′ describes the failure state of soil and it can be determined from the Mohr-Coulomb criterion. In the classical approach, the friction angle φ′ is a physical feature of soil, and its value depends only on the initial density. The paper aims at experimental verification of this assumption. The experimental results show that the value of the friction angle φ′ also depends on the stress path that leads to the failure of the sample. The experiments were performed in a classical triaxial apparatus and a true triaxial apparatus. Series of compression tests for constant initial soil density, were performed for three different states of stress: axisymmetric stress conditions, 3D stress conditions and plane strain conditions.

The Mohr-Coulomb friction angle of granular soils under different stress conditions