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Re: Precast poles behind retaining wall

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I'm picturing a Stonehenge-type configuration that just happens to be
sitting next to a grade drop (hence the retaining wall).

How is the lateral load on the column resisted?  If it's earth pressure and
it's acting in the direction of the wall, then the pressure from the columns
*will* influence the wall that's only 4 ft. away.  If you isolate the column
from the soil then you have no passive resistance and the column falls over.

I'm not aware of the details of the project, but my first thought is to
incorporate a base for the precast column into the footing for the retaining
wall.  Use the dead weight of the column to help the wall resist overturning
caused by earth pressure and the lateral force on the column.

Jason Kilgore
Leigh & O'Kane, L.L.C.
816-444-9655 (FAX)
----- Original Message ----- 
From: "Sarah Nuttall" <snuttall(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Wednesday, July 23, 2003 4:47 PM
Subject: Precast poles behind retaining wall

> I am working on a project where the architectural design calls for direct
> buried precast concrete columns placed on a circle supporting a lateral
> load of approx. 3000 lbs. each, within 4 ft. of the face of a retaining
> wall. I am trying to isolate the load from impacting the retaining wall
> design. I was initially using a mechanically stabilized earth wall with
> column extending below the wall. Now that I have to design a cast in place
> cantilever retaining wall, I have an interference between the wall
> foundation and the columns. I am considering the option of providing a
> block-out in the retaining wall foundation for the width of the precast
> column and a rock sleeve. The columns are spaced more than 30' apart.
> I'd appreciate any ideas on how I can isolate the retaining wall from the
> column loads. Also, how do I prevent soil structure interaction between
> column and the earth behind the wall, something along the lines of a void
> form, perhaps?
> Sarah H. Nuttall

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