Question

Compute the active pressure intensity when the backfill has unit weight of 18 KN/m^3 and height of wall is 6 m. The angle of internal friction is 300. The backfill has surcharge of 36 KN/m^2.

(a) 45 KN/m^2

(b) 75 KN/m^2

(c) 48 KN/m^2

(d) 78 KN/m^2

I got this question in an online quiz.

My question is taken from Earth Pressure Problems in chapter Failure Envelopes & Earth Pressure of Geotechnical Engineering II

Answer 1

Right answer is (c) 48 KN/m^2

Best explanation: Given,

q = 36 KN/m^2

Pa=Ka γH+ Ka q= \((\frac{1}{3})\) ×18×6 + \((\frac{1}{3})\) ×36

Pa= 48 KN/m^2.