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Delwyn G. Fredlund Chapter 1 - Introduction to Unsaturated Soil Mechanics The first lecture introduces unsaturated soils by illustrated practical problems. Fredlund Chapter 2 - State Variables and their Measurement The second lecture presents the state variables by which the transition from the saturated soil condition to the unsaturated soil condition can be described, in particular the matric suction as the difference between pore-air and pore-water pressures.
The measurement of soil suction helps in linking the state of stresses in field and laboratory conditions. The experimental measurement of the SWCC is explained and inherent parameters depending on the type of soil are introduced. Fredlund Chapter 4 - Seepage through Unsaturated Soils The fourth lecture is dedicated to the theory and solution dealing with water flow problems in unsaturated soil.
Focus is made on the measurement of unsaturated coefficient of permeability function for design purposes. Steady state and unsteady transient state methodologies are explained for the calculation of unsaturated coefficients of permeability. Selected water flow case studies are shown. Fredlund Chapter 5 - Shear Strength of Unsaturated Soils Lecture five addresses the determination of shear strength of unsaturated soils.
The latter is described by two independent state variables among which soil suction contributes to the cohesive component of soil. Measurement of shear strength of unsaturated soils is conducted by the conventional shear box and triaxial equipment needing modifications to allow air-entry in tested specimens. Using the shear strength parameters of unsaturated soil, current soil mechanics applications: e.
The main objective is to establish the relation between stress state variables and deformation strain state variables for unsaturated soils. In this process, the use of SWCC enables the assessment of the behaviour of unsaturated soil.
Unsaturated Soil Mechanics in Engineering Practice
Unsaturated Soil Mechanics