Discussion Forum : Failure Envelopes And Earth Pressure
Question - For cohesion-less soil, the ratio of major to minor principal stress is __________
Options:
A .  \(\frac{σ_1}{σ_3} = cos^2 (45°+\frac{φ}{2})\)
B .  \(\frac{σ_1}{σ_3} = sin^2 (45°+\frac{φ}{2})\)
C .  \(\frac{σ_1}{σ_3} = tan^2 (45°+\frac{φ}{2})\)
D .  \(\frac{σ_1}{σ_3} = tan^2 (45°-\frac{φ}{2})\)
Answer: Option C
Answer: (c).\(\frac{σ_1}{σ_3} = tan^2 (45°+\frac{φ}{2})\)

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