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Precast poles behind retaining wall

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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 the 
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 the 
column and the earth behind the wall, something along the lines of a void 
form, perhaps?

Sarah H. Nuttall

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