Combined effects of freeze–thaw cycles and chemical corrosion on triaxial mechanical properties of sandstone

Abstract To study the combined effects of freeze–thaw cycles and chemical corrosion on deterioration mechanism triaxial mechanical properties sandstone in cold regions, compression tests were carried out homologous specimens after action acidic, alkaline or neutral solution cyclic action, by taking pH value hydrochemical number as control parameters. The failure mode is shear-slip failure, deviatoric stress–strain curves can be divided into four stages compaction, linear elastic, yield, failure. law analyzed. With increase cycles, peak stress, strain modulus all decrease, degree rock increases, yield plateau plastic characteristics stage become weaker. strong acid shows largest damage, decreased significantly. precipitates produced reaction between adhere to specimen surface, pores, fissures, thereby inhibiting further damage deterioration. Confining pressure an essential factor affecting properties. As confining strength deformation-resistant ability increase, curve more obvious. sensitivity acidic obviously greater than that solution. These results provide a theoretical basis for construction geotechnical engineering structures regions.