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Re: Retaining wall design pressures

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P. Rajendran wrote:

. > Uplift becomes an important parameter when designing an underground tank
. > such as a sump pit or a lift station.  The tank should have adequate
. > weight to counteract possible floatation, especially just after
. > construction with no equipment installed inside the tank, at which time
. > the weight is at its minimum.  Uplift may also be a governing criterion
. > for designing the bottom plate of the tank.
. > 
. > In standard retaining walls uplift is rarely significant.  For practical
. > purposes, the water pressure on top of the base slab can be assumed to
. > be equal to the uplift at the bottom of the slab, unless the base slab
. > is very thick.
. > 

However, the buoyant weight of the footing reduces the resistance to 
overturning and sliding.  While it's true that a retaining wall will not 
float away or pop out of the ground like a tank can, it sure can overturn or 
move horizontally.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona