Table Of ContentEXPERIMENTAL EVIDENCE AND THEORETICAL APPROACHES
IN UNSATURATED SOILS
PROCEEDINGS OF AN INTERNATIONAL WORKSHOP ON UNSATURATED SOILS
TRENTO/ ITALY/ 10 -12 APRIL 2000
Experimental Evidence and
Theoretical Approaches in
Unsaturated Soils
Edited by
A.Tarantino
Universitet degli Studi di Trento, Italy
C. Mancuso
University degli Studi di Napoli Federico II, Italy
Taylor & Francis
Taylor & Francis Group
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Organised by the Department of Structural and Mechanical Engineering of the
University of Trento, Italy, with the support of the Department of Geotechnical
Engineering of the University of Naples Federico II, Italy, under the auspices of the
Technical Committee on Unsaturated Soils (TC6) of the International Society of Soil
Mechanics and Geotechnical Engineering (ISSMGE) and the Italian Geotechnical
Association (AGI).
The texts of the various papers in this volume were set individually by typists under the
supervision of each of the authors concerned.
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© 2000 Taylor & Francis
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points out that some imperfections in the original may be apparent
Experimental Evidence and Theoretical Approaches in Unsaturated Soils, Tarantino & Mancuso (eds)
© 2000 Taylor & Francis, ISBN 90 5809 186 4
Table of contents
Preface(cid:9) VII
Acknowledgements(cid:9) VIII
Experimental evidence
Experimental investigations on the stress variables governing unsaturated soil(cid:9) 3
behaviour at medium to high degrees of saturation
ATarantino & L Mongiovi
Investigating infiltration into compacted unsaturated heterogeneous soils(cid:9) 21
I Shevelan & CHird
Collapse tests on isotropic and anisotropic compacted soils(cid:9) 33
M Barrera, E. Romero, A Lloret & AGens
Retention curves and 1-D behaviour of a compacted tectonised unsaturated(cid:9) 47
clay
A Di Mariano, CAiro Farulla & CValore
Volume change behaviour of a dense compacted swelling clay under stress(cid:9) 65
and suction changes
M.Yahia-Aissa, P.Delage & Y.J.Cui
Soil behaviour in the small and the large strain range under controlled suction(cid:9) 75
conditions
R.Vassallo & C. Mancuso
Retention curves of deformable clays(cid:9) 91
E. Romero & J.Vaunat
Theoretical approaches
(cid:9)
Inclusion of hydraulic hysteresis in a new elasto-plastic framework 109
for unsaturated soils
M S. R. Buisson & S.J.Wheeler
v
An elastoplastic hydro-mechanical model for unsaturated soils(cid:9) 121
J.Vaunat, E. Romero & C.Jommi
Remarks on the constitutive modelling of unsaturated soils(cid:9) 139
C Jommi
Modelling the behaviour of unsaturated silt (cid:9) 155
EGeiser, L. Laloui & L.Vulliet
Interpretation of shear response upon wetting of natural unsaturated pyroclastic 177
soils
MV.Nicotera
Miscellaneous
Author addresses(cid:9) 195
List of participants(cid:9) 197
Author index(cid:9) 199
VI
Experimental Evidence and Theoretical Approaches in Unsaturated Soils, Tarantino & Mancuso (eds)
© 2000 Taylor & Francis, ISBN 90 5809 186 4
Preface
We happen to be involved in research. But research does not always lead to
experimental results and numerical simulations that are in good agreement with each
other. Research is also studded with errors, results that are difficult to interpret and
theories that go nowhere. Whether working in a laboratory, struggling with apparatus
that sometimes makes fun of us, or using a computer that refuses to co-operate and
returns nothing but error messages, we understood one important thing. No research
can be carried out alone. We need to share ideas, troubles, and doubts. That was the
essence of the workshop that took place in Trento on 10 —12 April 2000.
In line with the aim of the workshop, sufficient time was allowed for each speaker to
give a detailed presentation. Each presentation was then followed by an equal amount
of time that was given to the audience for discussion. In this respect, we wish to thank
the discussion leaders of the three sections of the workshop, who led the long debate
following each presentation. As pointed out above, research needs to be fed by
continuous discussion. Thus, we also wish to thank the more experienced researchers,
often co-authors of the papers presented in this book, for giving us the opportunity to
think further.
The works published in this book have been revised following comments,
discussion and suggestions from the audience and post conference referee. Authors
were invited not to be afraid of presenting works still underway, highlighting
limitations and blackpoints of their experimental and theoretical research. We hope
this will be of help to other researchers. At the same time, we are aware that the reader
of this book will expect to find some advances in unsaturated soil mechanics. We are
confident her or his expectations will not be disappointed.
Alessandro Tarantino & Claudio Mancuso
VII
Experimental Evidence and Theoretical Approaches in Unsaturated Soils, Tarantino & Mancuso (eds)
© 2000 Taylor & Francis, ISBN 90 5809 186 4
Acknowledgements
Many contributed to the success of the workshop. Among them, we wish to thank
Professor Luigi Mongiovi for his continuous support and advice, and Dr Elisabetta
Nones of the Conference Office of the University of Trento, who undertook a
significant part of the organisation.
Special thanks go to the discussion leaders in the workshop:
Professor S.Aversa, Dr G. Bosco, Professor P.Delage, Dr C. Mancuso, Professor
R. Nova, Dr V. Sivakumar.
Last but not least, we wish to thank all the speakers in the workshop: Mauricio
Barrera, Marc Buisson, Alessandra Di Mariano, Francoise Geiser, Cristina Jommi,
Duilio Marcial, Marco Nicotera, Enrique Romero, John Shevelan, Roberto Vassallo,
Jean Vaunat. To you all, thank you.
VIII
Experimental evidence
