1.

For cohesion-less soil, the ratio of major to minor principal stress is __________

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» D. \(\frac{σ_1}{σ_3} = tan^2 (45°-\frac{φ}{2})\)


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