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RE: Sliding

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Even without seeing an actual gap from dried soil pulling away, the pressure
can be expected to be far less than the design value most of the time.  In
many cases, the soil lateral design pressure is based on the worst patch of
soil on the site after a long rain.  This doesn't describe most of the site
most of the time, even if a gap isn't present.  

Paul Crocker, PE, SE

-----Original Message-----
From: BCainse(--nospam--at) [mailto:BCainse(--nospam--at)]
Sent: Friday, November 15, 2002 11:06 AM
To: seaint(--nospam--at)
Subject: RE: Sliding

I wouldn't rely on side friction on a normal perimeter wall footing wall.
In the Bay Area we frequently see the soil pull away from the wall during
the summer months when the soil dries out.  Somehow, I don't think the
resulting air gap has much frictional resistance. :<)

Bill Cain, SE
Albany CA

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