A three-scale poromechanical model for swelling porous media incorporating solvation forces: Application to enhanced coalbed methane recovery

•Development of a new poromechanical model for expansive porous media with two levels of porosity.•Incorporation of solvation forces through formal homogenization coupled with density functional theory.•Numerical reconstruction of the homogenized non-linear poroelastic coefficients dependent on the solvation force.•Computation of cleat closure due to CO2 injection in coalbed methane recovery.