Abstract: To investigate the effect of chemical corrosion on rock’s dynamic mechanical properties, chemical solutions of different ions and different pH values were prepared according to the chemical composition of deep groundwater. Surrounding rock specimens were soaked in the solutions and then dynamic compression tests were conducted by using SHPB (Split-Hopkinson Pressure Bar). Results reveal that chemical corrosion has obvious effect on the dynamic mechanical properties of surrounding rock. The strength of surrounding rock reduces under chemical corrosion, and with the decrease of pH value the strength decreases more obviously. On the basis of the damage theory and the test results, the constitutive model of rock under chemical corrosion was established. This study provides reference for deep research on dynamic properties of deep rock and its support and stability control.

Key words: Split-Hopkinson Pressure Bar, rock dynamics, chemical corrosion, surrounding rock, dynamic properties, constitutive model