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This Geotechnical Special Publication contains over 215 papers
presented during the Fourth International Conference on Unsaturated
Soils held in Carefree, Arizona on April 2-5, 2006. These papers
document the experience of researchers and practitioners from
around the world, concerning a vast array of unsaturated soil
problems. Theoretical and methodological advances in laboratory
testing of shear strength and volume change behavior, suction
measurement techniques, soil water characteristic behavior,
constitutive and numerical modeling, microscale modeling,
foundation behavior, heave of slabs and pavements,
evapotraspirative covers, geophysical applications, liquefaction
and soil dynamics, pavements and slopes, soil-atmospheric
interaction, desiccation and shrinkage, in situ testing, seepage,
flow of water and gas, and design of waste depositories with
emphasis on temperature effects are among the topics dealt with in
the framework of unsaturated soil behavior. Materials addressed
include natural soils, both expansive and non-expansive, chemically
stabilized soil, geosynthetics, geocomposite soils, and bentonite
products.
This proceedings contains 38 papers that advance understanding of
measuring, characterizing, and predicting the properties, behavior,
and performance of unsaturated materials typically used in
geotechnical engineering practice. The materials addressed include
coarse-grained soils, compacted soils, geotextiles, loess, residual
soils, shales, spoil fill, and swelling and expansive soils. These
unsaturated materials are characterized with respect to soil-water
characteristic curves, hydraulic conductivity, shear strength,
and/or stress-strain properties. Both static and dynamic loading
conditions are considered. Advances in the state of the art with
respect to both laboratory and field measurements of unsaturated
soil properties are included. Finally, predictions of unsaturated
soil properties and their behavior with respect to specific
applications, such as landfill liners and covers, heave of slabs on
grade, and the bearing capacity of foundations on or in unsaturated
soils are addressed.
This collection of papers presented at the sessions on
""Unsaturated Soil Engineering Practice"" held during the First
National Conference of the ASCE Geo-Institute at the Utah State
University in Logan, Utah from July 16-19, 1997. The significance
of unsaturated soils in geotechnical engineering practice is great.
The vast majority of the infrastructure is founded on and in
unsaturated soil deposits. Unsaturated soil foundation problems are
commonly associated with moisture-sensitive soils, wherein soils
exhibit significant volume change and/or strength reduction upon
wetting and represent a common geotechnical concern in both arid
and humid climates. These papers address recent practice,
experience, and advances in unsaturated soils engineering. The
magnitude of unsaturated soil concerns is clearly identified
through the diversity of topics presented. Rational, unified
approaches for dealing with these unsaturated soil problems have
recently emerged, providing the geotechnical engineer with tools of
analysis for these problems.
This proceedings, ""Unsaturated Soils"", consists of papers
presented at sessions of the 1993 ASCE National Convention and
Exposition held in Dallas, Texas, October 24-28, 1993. The papers
include both practice and research in the analysis and design of
geotechnical engineering and geo-environmental works in unsaturated
soils. The first part on unsaturated soil behavior addresses the
history, as well as current trends in unsaturated soil mechanics,
methods of predicting volume change of compacted and
naturally-occurring soils, laboratory and field methods for
obtaining unsaturated soil characteristics, unsaturated flow, and
unsaturated hydraulic conductivity determination. The second part
on mitigation of expansive soil damage addresses engineering
practice and case histories on shrink/swell behavior, performance
of moisture barriers, and performance of foundations while it
focuses on successful methods of avoiding or mitigating damage for
soil movements. The issues addressed in these proceedings are
intended to demonstrate the wide range on unsaturated soils
problems and to show advances in unsaturated soil mechanics
practice.
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