I recommend you get a copy of : GT-16 <GT-16.PDF> (0.7 M) - "Determination
of Unknown Subsurface Bridge Foundations," (NCHRP 21-5 Interim Report
Summary) at http://www.fhwa.dot.gov/bridge/geonote.htm
<http://www.fhwa.dot.gov/bridge/geonote.htm> for a start. This is a pdf
document you can get for free.
I would also recommend : Nondestructive Testing of Unknown Subsurface Bridge
Foundations - Results of NCHRP Project 21-5 available at
http://www.nationalacademies.org/trb/bookstore/ for under $20 US.
Good luck and regards.
Michael R. Bleakney, P. Eng.
Geotechnical Engineer
New Brunswick Department of Transportation
Design Branch
PO Box 6000
Fredericton, NB
E3B 5H1
Canada
Phone: (506)453-2674
Fax: (506)457-6714
E-mail: [log in to unmask] <mailto:[log in to unmask]>
-----Original Message-----
From: Alex Carson [SMTP:[log in to unmask]]
Sent: Sunday, June 25, 2000 3:53 PM
To: [log in to unmask]
Subject: Pile length
I am investigating the settlement of a viaduct with piled
foundations. The construction records indicate that the piles were driven
cast in-situ concrete. The ground condtions are peat with alluvial sands
overlying till and sandstone. At the abutments, where the worst settlement
has occurred (approx 200mm) the peat was excavated and replaced with
hydraulic sand fill.
The problem is how long are the piles because the pile length on the
construction records are significantly shorter than the design lengths. The
piles are raking. Access to the top of the piles is 5 to 6 metres below
ground level.
Any ideas would be gratefully received on how to determine the
position of the toe of the piles or even just the depth.
Alex Carson
Principal Geotechnical Engineer
Babtie Shrewsbury
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