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For a cohesion less soil with surcharge Q, the passive pressure intensity is ___________

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+1 vote
in Geotechnical Engineering II by (93.8k points)
For a cohesion less soil with surcharge Q, the passive pressure intensity is ___________

(a) pp=Kp γz+Kp q

(b) pp=Kp γz-Kp q

(c) pp=Kp γz*Kp q

(d) pp=Kp γz/Kp q

This question was addressed to me in an international level competition.

My enquiry is from Passive Earth Pressure: Rankine’s Theory topic in chapter Failure Envelopes & Earth Pressure of Geotechnical Engineering II

1 Answer

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by (243k points)
The correct option is (a) pp=Kp γz+Kp q

Easy explanation: When the backfill is horizontal and carries a surcharge q, then the vertical pressure increment will be by q. Due to this, the lateral pressure will increase by Kp q. Hence, lateral pressure at the depth of wall H is pp=Kp γz+Kp q.

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