Civil Engineering MCQAE Level Civil Engineering

Rankine's passive earth pressure coefficient for cohesionless soil is:

Soil MechanicsSoil Mechanics and Foundation EngineeringHARD

Choose the correct answer

A

tan^2(45 + phi/2)

B

1 - sin phi

C

tan^2(45 - phi/2)

D

cos phi

Correct Answer

A. tan^2(45 + phi/2)

Why is this the answer?

Kp = (1 + sin phi)/(1 - sin phi) = tan^2(45 + phi/2).

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