Abstract
Abstract A general thermomechanical model is derived for an arbitrary mixture. The system is described by proper choices of free energy and dissipation function. The general theory is applied to a TH model for a mixture of compacted bentonite, liquid water, vapour, and air. The free energy of the system is chosen to take into account the individual behaviours of the components and their mutual interactions through adsorption, vaporisation, and mixing of the gaseous components. An important tool is the equilibrium condition for the water species in different combinations of the components. The resulting thermodynamically consistent macroscopic model is fitted to a suction experiment and applied to a simple 1D TH simulation of the bentonite buffer of the Febex in situ test. The results calculated with FEM are compared to measurements.
Published Version
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