Dear Radu

Charles Hird and I have a current research project at Sheffield University in which we are 
looking at the 'reverse' of this problem.  We are driving small diameter piezocones (1 sq cm 
and 5 sq cm) into 400mm diameter model foundations made of clay interspersed with fine layers 
of silty sand - in contrast with your situation of clay layers in sand.  Between them, our two 
probes allow measurements of pore pressure to be made at five locations: on the cone tip, the 
cone face, on the shoulder and two on the shaft.  The aim of the research is to be able to 
specify an interpretation method that we have validated against the results from experiments 
in which we know the thicknesses and the permeabilities of the different layers.  An outline 
of the research proposal can be found on both the Sheffield (http://www.shef.ac.uk/~grg/) and 
Oxford University ((http://www-civils.ox.ac.uk/) web pages, with rather more detail on the 
latter.  We are not yet far enough through the research to have reached any conclusions, so 
this may not be very helpful to you at this stage.  However, we would be very interested in 
your own experience and happy to discuss our project with you.

Yours

Gilliane Sills 

 
On Wed, 22 Mar 2000 17:17:11 +0100 Radu Schwab <[log in to unmask]> wrote:


> We are doing some field investigations on a site where thin clay or coal
> layers (few
> centimeters up to few decimeters) of  are embedded in a depth layer of
> fine sand.
> We had done in this thin layers some dissipation tests with CPTU and we
> are
> looking for a method to interpret the results.
> I would be very obliged if somebody could give me some information about
> this topic.
> Thanks,
> Radu
> 
> 
> --
> Dr. Radu SCHWAB
> Bundesanstalt fuer Wasserbau
> Postfach 21 02 53
> D-76152 Karlsruhe, Germany
> 
> Tel.: +49 (0)721 9726 3810
> Fax: +49 (0)721 9726 4830
> e-mail: [log in to unmask]
> URL:  http://www.baw.de
> 
> 

----------------------
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
[log in to unmask]




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