mechanical parameters are among the most important factors for design of underground structures. Fluids can diffuse into the rock formations through joints and disperse according to Fick equations. Propagation of Acidic fluids in rocks results in the decrease of their Compressive strength and Young’s modulus (Elasticity modulus). There are numerous methods for measurement of hardness. It was found that with an increase in the acidity of the fluid, the degree of propagation also increases. The presence of the Ferric ion (Fe3+) also promotes the propagation of the fluid within jointed rock medium. Experiments were done using a cylindrical indenter and it was also noted that the Elasticity modulus and Compressive strength demonstrate a sharp decrease, when the acidity of the fluid increases. Experiments were done using a plated cylindrical indenter and it is found that with the passing of time, both compressive strength and Elasticity modulus of the sample decrease.
