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RE: foundation on rock

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Ms. Casano:

In you neck of the woods only that nasty seismic code would be a concern;
i.e. nearby faults and fractures in the granite.

The presumptive bearing capacity for competent granite is, well, lets just
say it's high.

I would take a look at drainage. The rock layer may act as an aquatard under
the compacted fill.

We should all have site with this problem.

Arvel

-----Original Message-----
From: Casano, Karen [mailto:Karen.Casano(--nospam--at)dgs.ca.gov]
Sent: Tuesday, February 08, 2005 4:14 PM
To: 'seaint(--nospam--at)seaint.org'
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 natural
grade?  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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