Question: The state of stress on a small element is v = 21 kPa, h = 10 kPa, and the shear stress on the

The state of stress on a small element is σ v = 21 kPa, σ h = 10 kPa, and the shear stress on the horizontal plane is +3 kPa.
(a) Find the magnitude and directions of the major and minor principal stresses.
(b) If the material is a loose sand, can you say whether the element is in a state of failure? If it isn't, how close is it? Why? State your assumptions clearly. (Assume ∅' = 28o for the loose sand.)?

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