If you are prepared to push a probe into the compacted trench, nuclear backscatter is a
possibility. The spatial resolution is of the order of centimeters so it's not very good at
identifying thin layers of comparatively high or low density and a field procedure has to be
well defined because of the radioactivity of the nuclear source - but it's a reasonably
reliable method.
Gilliane Sills
On Thu, 8 Feb 2001 15:53:07 +0000 David Hughes <[log in to unmask]> wrote:
> Has anyone any ideas on how to measure the compaction of backfill in a
> trench? I would like to monitor density with depth during compaction.
>
> The measurement needs to be carried out in a non destructive way (ie no
> excavation after compaction)
>
> I'm thinking along the lines of pressure cells or strain coils.
>
> Any other ideas? Is the dynamic measurement of surface compaction reliable!
>
> thanks
>
> David
>
>
> ---------------------------------------------------------------------
> Dr David Hughes CEng
> School of Civil Engineering
> Queen's University Belfast
> Belfast BT7 1NN
> N Ireland
>
> ph +44 (0)28 90 274014
> fax +44 (0)28 90 663754
> ----------------------------------------------------------------------
----------------------
Dr Gilliane Sills
Department of Engineering Science
University of Oxford
Parks Road
Oxford OX1 3PJ
Tel (44) (0)1865 273164
Fax (44) (0)1865 273907
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