Abstract
The theory of mixtures developed in the last 25 years sets a framework of sufficient flexibility for a macroscopic description of composition, relative motion and interaction in soils, provided one distinguishes from the outset between phases and constituents in phases. Such an extended kinematics is outlined in this paper. It is shown that the balance of mass of any phase or constituent of a phase can be expressed in terms of referential coordinates of any other phase or constituent of a phase. Two areas of application are outlined: (A) Motion of a liquid phase relative to a solid phase in a nonrigid soil; (B) motion of a solute relative to a liquid phase in a partially saturated, rigid soil.
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