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Re: foundation on rock

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In addition to the previous points mentioned, of concern would be the 
process of excavating with explosives to pre-determined levels. The 
process has to be such that new fissures at the bearing strata are 
kept to a minimum.

----- Original Message -----
From: "Casano, Karen" <Karen.Casano(--nospam--at)dgs.ca.gov>
Date: Tuesday, February 8, 2005 2:13 pm
Subject: foundation on rock

> Fellow Engineers (especially those with a geotechnical bent):
> 
> What potential performance problems might you anticipate with 
> placing a 12"
> thick mat foundation (for a small structure) ON TOP OF an existing 
> naturalgrade?  Existing natural grade is mostly rock (very dense 
> granite which
> would require blasting to remove or trench into), some sedimentary 
> rock and
> compacted DG, no frost issues (southern CA). Compacted fill would 
> be placed
> around the finished perimeter of the mat to provide drainage.  
> Lateral loads
> resisted by friction.
> 
> Karen E. Casano, SE
> San Diego
> 
> 
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