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  Failure criterion for Anisotropic rocks under True Triaxial Stress regime

  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 has been proven by many studies. Also in situ stress regime is hardly found similar to conventional triaxial state. There are theoretical models to understand this complex problem of anisotropic rock in a true triaxial or polyaxial stress regime of which this study uses the Jaeger's analytical approach, Jaeger (1960), to estimate failure strength for varying weak foliation orientations and find a theoretical solution considering the effect of σ2. For this, intact rock strength is estimated using Isotropic failure criterion that can be represented in MC parameters such as, Drucker- Prager criterion, Modified Lade and Modified Weibols and Cook criterion while major principal stress on weak foliation plane is calculated using Coulomb's theory.

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