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Re: Buoyancy

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Sorry, yes - dry, with nominal compaction. I should have said "open graded" not just open. 130-140pcf sounds about right with water, since solid stone tends to be about 160-170pcf, which would mean about 1/3 of the space is open, and and extra 20-25lbs of water in those voids, along with 105-110pcf stone, would be about 130pcf. Of course, from that saturated weight you have to subtract the equivalent volume of water to get the buoyant weight.

Hopefully somebody with day to day interactions with soil will respond here - I try to avoid design which involves dirt, except where someone gives me data for bearing capacity.

Jordan



Bill Allen wrote:
Dry?

T. William (Bill) Allen, S.E.
ALLEN DESIGNS
Consulting Structural Engineers
 V (949) 248-8588 . F(949) 209-2509

-----Original Message-----
From: Jordan Truesdell, PE [mailto:seaint2(--nospam--at)truesdellengineering.com] Sent: Tuesday, November 04, 2008 8:22 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Buoyancy

I always thought open gravel was more like 105pcf.

Jordan



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