Abstract
In order to investigate the deterioration pattern of red sandstone under acidic environment, the porosity and mechanical parameters of red sandstone specimens at different stages under different pH corrosion were measured by physical tests and uniaxial compression tests, and the effects of pH and corrosion time on the porosity and mechanical parameters of red sandstone specimens were investigated. Based on the changed in secondary porosity of red sandstone specimens after acid corrosion, chemical damage variables were introduced, and a mathematical function of chemical damage variables and mechanical parameters was established. Based on the characteristics of the uniaxial compression stress–strain curve and the Lemaitre strain equivalence principle, combined with the Weibull distribution statistical damage model for micro-fractures and porosity changed after acid corrosion, and considered the effect of the compression-tight stage, the constitutive model of the red sandstone was obtained by segmentation. The theoretical constitutive curve is compared with the test curve to check the reasonableness of the constitutive model.