| Summary: | Anisotropic compression in triaxial cell during shearing demonstrates the rotation of the mobilised shear strength envelope towards shear strength envelope at failure. The shape of the mobilised shear strength envelope takes the real form of the shear strength envelope at failure which is non-linear at low stress level and linear at higher stress level. The inclination of the linear section for the mobilised shear strength envelope and the shear strength envelope at failure are represented as minimum mobilised friction angle, φ′ minmob and the minimum friction angle at failure, φ′ minf respectively. The value of the minimum mobilised friction angle, φ′ minmob corresponds to a specific axial strain irrespective of the net stress or effective stress applied in the tests. This is implicating that there is a unique relationship between minimum mobilised friction angle, φ ′ minmob against axial strain, εa irrespective of the value of net stress or effective stress. This is a concept of effective stress and shear strength interaction in characterising the soil volume change behaviour and it is being applied in anisotropic soil volume change framework known as Rotational Multiple Yield Surface Framework. Different soils show different shape of this relationship and this unique relationship will be presented in this paper. © 2010 Taylor & Francis Group, London.
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