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Re: [Fwd: passive pressure for retaining wall]

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Generally speaking, passive resistance is considered immobilizable for
some depth (usually the frost depth) below the ground surface.  It,
therefore, seems that Amerhein's approach may be unconservative.

Also, it behooves to make very conservative assumptions in estimating
passive resistance, because a significant wall movement/rotation has to
occur before the full passive resistance gets mobilized.

Unless the wall foundation is fairly deep below the toe side ground
surface, I ignore passive resistance completely.


> I have the second edition of Amerhein's book and the solutions for
> passive sliding resistance do not appear odd by any means. In his
> example the passive is figured based on the depth of soil in front of
> the key and starts at zero at the adjacent ground surface. Sounds pretty
> right to me.
> Interestingly, he extends the vertical wall steel into the key, but it
> graphically appears to be on the wrong side for bending resistance in
> the key. ... Maybe that's why he published another edition!
> Barry H. Welliver