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Soilbags are usually incorporated into temporary structures, rather
than being used in conventional construction, as they have a
tendency to deteriorate rapidly on prolonged exposure to sunlight.
The amazing bearing capacity of soilbags has, however, inspired the
development of an earth reinforcement method in which the bearing
capacity of soft foundations is enhanced, reaching ten per cent of
that of concrete. New methods have seen their projected durability
as a semi-permanent material extend to in excess of fifty years,
provided that direct exposure to sunlight and ultra-violet rays is
avoided. This book covers the development, properties and
characteristics of soilbags, as well as design features of
structures built by this method. The geotechnical applications in,
for example, railway ballast foundation reinforcement, retaining
walls and embankment constructions are extensively described and
richly illustrated by reference to case studies from Japan. The
intention is to stimulate a wider, international adoption of the
method in earth reinforcement and civil engineering construction,
with particular reference to developing countries. Geotechnical and
foundation engineers and other professionals working on earth
reinforcement will find this a valuable work, while it will provide
supplementary information to graduate students in soil mechanics
and foundation engineering.
The Cam-Clay model is a fundamental constitutive model in soil
mechanics, but is only suitable for normally consolidated clay
under triaxial compression stress states. The SMP failure criterion
is the most reasonable three-dimensional extension of the
Mohr-Coulomb failure criterion from the point of view of its
physical meaning, mathematical expression and geometrical
presentation. To integrate the Cam-Clay model with the SMP
criterion and extend it to sand and other geomaterials is one of
the fundamental tasks in geotechnical engineering. This book
introduces the SMP criterion, the integration of the SMP criterion
with the well-known Cam-clay model, and the application of the SMP
criterion to the general elastoplastic constitutive models for
geomaterials like clay, sand and unsaturated soil. In addition to
the theoretical development of constitutive models, the book is
full of high-quality experimental data obtained from conventional
and true triaxial tests on various soils. The scope and the level
of the book ensure that it will be a valuable resource for
postgraduate students, academics and geotechnical engineering
professionals alike
Soilbags, Donow in Japanese, have been commonly used as temporary
structures, rather than as real earth reinforcement construction
parts, because of their rapid deterioration on prolonged exposure
to sunlight. The amazing bearing capacity of soilbags has, however,
initiated the development of a novel and effective earth
reinforcement method in which the bearing capacity of soft
foundations can be greatly improved. The bearing load of
quality-controlled soilbags can reach 10% of that of concrete, and
their durability as a semi-permanent material can exceed 50 years,
provided that direct exposure to sunlight and ultra-violet rays is
avoided. A New Earth Reinforcement Method Using Soilbags covers the
development, properties and characteristics of soilbags, as well as
design features of structures built with soilbags. The geotechnical
applications of this method in railway ballast foundation
reinforcement, soft building foundation reinforcement and retaining
wall and embankment constructions are extensively described and
richly illustrated by reference to case studies from Japan. the
method in earth reinforcement and civil engineering construction in
other countries. Developing countries may have particular interest
in the soilbag method as an effective and economical alternative
for conventional earth reinforcement techniques. This volume is
intended for geotechnical and foundation engineers and other
professionals working on earth reinforcement. It may serve as a
supplementary information source on earth reinforcement for
graduate students in soil mechanics and foundation engineering.
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