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Re: Tolerable Slab Design

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Rich,
 
Two inches "of active swell" do not appear very tolerable.  
 
Possible solutions: 
 
1) Soil replacement (depending on how deep - is up to the geotech). 
 
2) Alternatively, can't you just address the cause of expansion - most probably, moisture? It way be more effective to built a condituous perimeter wall ("slit") to cut off moisture. 
 
3) Alternatively, or in addition to, (2), irrigation may be specified.
 
Again, the geotech shoudl be able to give the answers.  For additional info, regarding the above and other methods, refer to R.W. Brown, "Foundation Behavior and Repair."
 
Steve Gordin SE
Irvine CA
 
----- Original Message -----
From: "seaint03" <seaint03(--nospam--at)lewisengineering.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, September 28, 2005 10:23 AM
Subject: Tolerable Slab Design


> I received a geotechnical report to review for a foundation design for a
pre-
> engineered metal building.  It is a warehouse type building with lots of
> open spaces.
>
> The building is located on expansive soil.  One of the items in the report
> states to "design the slab to tolerate potential upward slab movement on
the
> order of about 2 inches of active swell".  I don't recall ever seeing a
> design procedure for designing a slab on grade to accommodate upward slab
> movement of any amount.  IS there some design procedure I am not aware of?
> Can anyone cite a reference I can research to help understand it?
>
> What are others commonly doing to design a warehouse type slab, large open
> spaces, for upward movements?  My thoughts are frequent shrinkage and
> construction joints to isolate slab panels and facilitate replacement if
> needed.
>
> Thanks for any insight.
>
> Rich
>
>
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