Abstract:Aimed to understand how rocks get deteriorated under acidified conditions,accelerated simulations of water-rock interaction for marble and diabase have been carried out continuously in static water surroundings with different acids (H2SO4,HNO3 and HCl) of different contents (1.0%,5.0% and 10.0%) for 900 days. The sensitivity of the deterioration of unconfined compressive strength(UCS),tensile strength and Shore hardness to acid types and acidity,and deterioration mechanism are analyzed. The results seem to indicate that strength deterioration,surface hardness deterioration and eroded rate will nonlinearly increase with the concentration of H+ and acid treatment time;and environmental effect of the simulation conditions is directly correlated to the lithology,acid types and the concentration of H+ as well as further dissolution of the new salts in water. The sensitivity to both strength deterioration and hardness deterioration of marble and diabase under individual acid conditions is different from that under mixed acid surroundings. In the case with individual acid,vitriol and nitric acids are relatively sensitive to marble and diabase when the content of acid is less than 5.0%. However,the sensitivity will decrease and the effect on deterioration will become stable when their content is more than 5.0%. It shows that different acid types play different roles in deterioration of carbonate and silicate rocks. In the case of mixed acids,the deteriorations of strength and hardness of marble gradually increase with the increase of the content of vitriol acid. However,the activities of vitriol,nitric acid and hydrochloric acid are equal for diabase. It shows that the mechanisms of erosive function in carbonate rock are different from that in silicate rock under the mixed acid conditions. Generally,the deteriorations of strength and hardness in both marble and diabase are more intensive in the case of mixed acids than that in the individual case. Further,in both cases,the deteriorations of marble are more intensive than those of diabase,and the damage in tensile strength,UCS,and Shore hardness will decrease in order.