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RE: Increasing Footing Bearing Pressure

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A while back, I was involved in a shopping mall renovation project in Long 
Island, New York.  A new third level was being added to a two story mall, so 
the existing footings needed to resist much more gravity load.

Two options were studied
1.  Soil grouting the footings to increase the allowable bearing pressure 
from 8 ksf to 16 ksf.
2.  Enlarging the footprints of the footing at 8 ksf.

The second option was chosen.  In this case, soil grouting was expensive and 
the space to grout in was confined / restricted.

Naturally, either way we had to strengthen / deepen  the footing for the 
increased punching shear and flexure.  But I think it is possible to greatly 
increase bearing pressure by soil grouting.

Steve Uthoff, S. E.
From: ron.schneider(--nospam--at)
To: seaoc(--nospam--at)
Subject: Increasing Footing Bearing Pressure
Date: Tuesday, October 28, 1997 7:18PM

     Has anyone or does anyone have any experience with or information on
     increasing allowable footing bearing pressure by using pressurized
     grouting under existing footings?  This method makes sense when
     potential settlement is the controlling factor in establishing
     allowable footing bearing pressures. This could be an alternative to
     increasing existing footing bearing area.

     Ron Schneider