Abstract
This paper is devoted to the modelling of stress-sensitive Biot coefficient experimentally observed in low permeable sandstones. Sandstones are described as an assemblage of rigid inclusions surrounded by poroelastic interfaces representing joints between grains and pores. A micromechanical model of Biot coefficient under loading is developed, which highlights the role of interfaces closure on the poroelastic macroscopic behaviour. Experimental results available concerning low permeability sandstones are analyzed in view of this model.
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