Soil Mechanics and Foundation Engineering

Q: The active earth pressure of a soil is proportional to (where φ is the angle of friction of the soil)

(a) :  tan (45° - φ)
(b) :  tan2 (45° + φ/2)
(c) :  tan2 (45° - φ/2)
(d) :  tan (45° + φ)
(e) :  None of these
Answer:  tan2 (45° - φ/2)
Explanation:  

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