Dear Andrew
Thanks very much for responding to my message.
The vertical drain at the centre is a geosynthetic filter bag of circular
cross section and is filled with uniformly graded fine sand. Application of
rigid surcharge at the top would result in bulging of the drain to
accomodate the settlement. Hence the need for a solution that does not
impose zero radial strain condition on the inner boundary.
I am aware of the use of Fourier analysis to solve quasi-axisymmetric
problems where only the loading does not follow axis symmetry. However, I
don't quite understand the need for this in back-analysing our experiments
in which both the geometry and the loading follow axis symmetry. The radial
strains at the inner boundary (at any vertical cross-section) are going to
be the same along the circumference.
Thank you. With best wishes,
Jitendra
> Hi folks !
>
Dear Jitendra,
> I am trying to back-analyse results obtained from large scale (1.0 m
> diameter) radial consolidation experiments involving kaolin clay installed
> with a central vertical drain. I am using Biot's theory. The solution that
I
> have assumes both inner and outer radial boundaries as fixed in radial
> direction. However, this is not the case in our experiments. The inner
> radial boundary is free to move both in radial as well as vertical
> direction. Are you aware of any solution that does not impose the
condition
> of zero radial displacement at the inner radial boundary while keeping the
> excess pore pressures to be zero on this boundary?
>
It is not clear why your inner radial boundary is free to move in
radial direction. If it does, you would need a full 3-D or a Fourier
series type analysis to analyse the problem.
> Many thanks for your help.
>
> With best wishes,
>
> Jitendra Sharma
regards,
Andrew
> Geotechnical Research Centre, NTU, Singapore.
>
--
All things changed but not the fundamentals.
- Ancient Chinese saying
Dr. Andrew H.C. Chan: [log in to unmask] or [log in to unmask]
Reader, School of Civil Engrg, Univ of Birmingham B15 2TT UK
Tel: +44(0)121 414 5100 Fax: +44(0)121 414 3675 Room 118B
http://www.bham.ac.uk/CivEng/pg/soils/chan/chan01.htm
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