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For a submerged backfill, the active earth pressure is given by _________

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+1 vote
in Geotechnical Engineering II by (93.7k points)
For a submerged backfill, the active earth pressure is given by _________

(a) pa=Kaγ’z

(b) pa=Kaγ’z-γwz

(c) pa=Kaγ’z+γwz

(d) pa=Kaγ’z*γwz

I had been asked this question during an interview.

The query is from Active Earth Pressure: Rankine’s Theory topic in section Failure Envelopes & Earth Pressure of Geotechnical Engineering II

1 Answer

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by (243k points)
Right choice is (c) pa=Kaγ’z+γwz

Easy explanation: For a submerged backfill, the lateral pressure is made up of two components,

lateral pressure due to submerged weight of backfill

lateral pressure due to water

∴ pa=Kaγ’z+γwz.

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