Question

What will be the co-efficient of passive earth pressure, at a depth of 8m in cohesion less soil sand with an angle of internal friction of 30° when the water rises to the ground level?

(a) 4

(b) 5

(c) 3

(d) 1

I have been asked this question by my school teacher while I was bunking the class.

I would like to ask this question from Plastic Equilibrium in Soils : Active and Passive States in division Failure Envelopes & Earth Pressure of Geotechnical Engineering II

Answer 1

Right option is (c) 3

To explain: Given φ = 30°

Co-efficient of passive earth pressure, Kp = (1 + sin φ) / (1 – sin φ)

Kp = (1 + sin 30)/ (1 – sin 30°)

KP = 3.