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Abstract: Strength anisotropy is characteristic to sedimentary and metamorphic rocks and is often markedly directional in their strengt h behaviour under triaxial stress regime. Mohr-Coulomb criterion and most conventional analyses of rock failure have ignored the influence of intermediate principal stress, σ2 (σ1 ≥ σ2 ≥ σ3) by assuming σ2=σ3, which tends to underestimate the strength of such rocks, as...