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Rankine vs Coulomb Failure envelope

Rankine vs Coulomb Failure envelope

(OP)
As for the Rankine method (where the active failure plane behind the wall = 45+phi/2), can someone please explain to me (or at least point me in the right direction) how you would derive the failure plane angle for the Coulomb method?

RE: Rankine vs Coulomb Failure envelope

NCMA Design Manual or Keystone Walls Design Manual

You should be able to find one on internet. It is a monster formula.

If you wanted to "derive" it then have fun with math.

RE: Rankine vs Coulomb Failure envelope

I should point out that active earth pressure angle is 45-phi/2

RE: Rankine vs Coulomb Failure envelope

It depends on whether you measure for from the vertical or horizontal.

www.PeirceEngineering.com

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