This book deals with the behaviour of soft ground improved by
some of the more common methods, including the installation of
prefabricated vertical drains (PVDs), or the installation of
soil-cement columns formed by deep mixing, or the preloading of
soft ground by application of a vacuum pressure in addition to, or
instead of, a surcharge loading. In particular, it describes the
theories and the numerical modelling techniques that may be applied
to these soft ground improvement schemes to estimate the immediate
and time-dependent mechanical response of the in situ soil.
Particular emphasis has been placed on methods that reliably
predict ground deformations associated with ground improvement
The book commences with a brief description of the various
ground improvement methods and then describes general techniques
for modelling the behaviour of soft clay subsoils by the finite
element method, as well as details of the methods for modelling
soft soils improved by the installation of PVDs. It also includes
chapters describing the theory of vacuum consolidation and methods
for calculating vacuum pressure-induced ground deformation, as well
as a theory which can be used to predict the response of soft
ground improved by the installation of soil-cement columns. An
important distinguishing feature of this book is the routine use of
comparisons of predictions of the proposed models with the results
of laboratory studies, and particularly field case studies, in
order to validate the proposed methods of analysis. The field case
histories are from soft soil sites at various locations around the
The book is directed towards students of geotechnical
engineering as well as geotechnical practitioners. In the main it
provides complete derivations of most of the important theoretical
results, as the intention was to write a book that could be used as
both a teaching text and a reference work for students and
Audience The book is intended for geotechnical practitioners as
well as for students.
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