Abstract:A series of uniaxial compression tests and computerized tomography(CT) scanning tests on dry,saturated sandstones,and the sandstones with hydro-physicochemical influencing effects due to the circulating flow of distilled water and different hydro-chemical solutions are conducted. The corresponding complete stress-strain curves and CT scanning results are obtained. The hydrophysical and hydrochemical influencing effects on the elastoplastic mechanical behaviors of sandstone,such as stress-strain relationship,elastic modulus,peak strength and residual strength are derived. The hydrophysical and hydrochemical influencing mechanisms of water-sandstone interaction are studied. The hydro-physicochemical damages of sandstones are analyzed based on the CT scanning results. The modified Duncan model is used to describe the mechanical behaviors of sandstones with different hydro-physicochemical influencing effects. This study has a useful reference to the theoretical and applied research in the field of water-rock interaction.