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Coulomb Earth Pressure

Coulomb Earth Pressure

Coulomb Earth Pressure

Can coulomb active earth pressure be greater than 1.0?
For the case:
wall backslope from vertical = 45degree
wall backslope from horizontal = 45 degrees
retained soil backslope = 16 degrees
friction angle = 30
friction between wall and backfill = 14 degrees

I calculate Ka= 1.396

RE: Coulomb Earth Pressure

Do you mean that the face of the wall is sloped (battered?) at 45 degrees while the retained soil behind the wall slopes upward at 16 degrees from the top of the wall? How can you have both 16 and 45 degree backslopes?


RE: Coulomb Earth Pressure

I didn't run any numbers yet because I want clarification from you. If phi = 0 degrees and the wall is leaning (battered) forward, Ka might be greater than 1.0. If the wall is plumb or leaning (battered) backwards, Ka should be <1.0.


RE: Coulomb Earth Pressure

I'm having trouble understanding it too. We should be able to provide you with a response if you give us a sketch.

RE: Coulomb Earth Pressure

avscorreia, where are your 45 degree backslope, 16 degree slope behind the wall, 14 degree wall friction (I see 13.5 degrees), and 30 degree phi angle? I don't see any of NBRY1's input.


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