Soil is fundamentally a multi-phase material - consisting of solid
particles, water and air. In soil mechanics and geotechnical
engineering it is widely treated as an elastic, elastoplastic or
visco-elastoplastic material, and consequently regarded as a
continuum body. However, this book explores an alternative
approach, considering soil as a multi-phase and discrete material
and applying basic Newtonian mechanics rather than analytical
mechanics. It applies microscopic models to the solid phase and
fluid phases, and then introduces probability theory and statistics
to derive average physical quantities which correspond to the
soil's macroscopic physical properties such as void ratio and water
content. This book is particularly focused on the mechanical
behaviour of dry, partially saturated and full saturated sandy
soil, as much of the physicochemical microscopic characteristic of
clayey soil is still not clear. It explores the inter-particle
forces at the point of contact of soil particles and the resultant
inter-particle stresses, instead of the total stress and effective
stress which are studied in mainstream soil mechanics. Deformation
and strength behaviour, soil-water characteristic curves, and
permeability coefficients of water and air are then derived simply
from grain size distribution, soil particle density, void ratio and
water content. A useful reference for consultants, professional
engineers, researchers and public sector organisations involved in
unsaturated soil tests. Advanced undergraduate and postgraduate
students on Unsaturated Soil Mechanics courses will also find it a
valuable text to study.
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