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NEC Civil · 2081 · Question 12

The active earth pressure of a soil is proportional to (where $$\phi$$ is the angle of friction of the soil)

GitBook practice — Set 4 (Ashadh, 2081)

A$$\tan (45^{\circ} - \phi)$$
B$$\tan ^{2}(45^{\circ} + \phi /2)$$
C$$\tan ^{2}(45^{\circ} - \phi /2)$$
D$$\tan (45^{\circ} + \phi)$$
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