The formulation of the macroscopic linear poroelastic behavior of a jointed rock is examined through a micro-macro approach. The joints are modelled as interfaces. First, Hill's lemma is extended to this medium. The macroscopic elastic behavior is then determined in the dry case. Taking into account a fluid pressure in the joints, it is shown that the knowledge of the macroscopic elasticity is sufficient to characterize the poroelastic behavior in the saturated case. The dual variable associated with the change of lagrangian porosity is shown to be the fluid pressure multiplied by the Biot coefficient of the joints.
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