Abstract: This paper presents the study on the correlation between the initial damage of rock defined by different parameters and the uniaxial compressive strength of rock. The basic mechanical parameters of limestone and basalt samples are obtained by acoustic wave velocity test and uniaxial compressive test. These parameters are used to define the initial damage of rock samples, and then the relationship between different types of initial damage variables and uniaxial compressive strength is analyzed. The results show that when using various parameters to define the initial damage of rock samples, the relationship between different types of initial damage variables and uniaxial compressive strength is approximately linearly negatively correlated. Among them, the limestone samples have the strongest linear correlation between the initial damage of the rock defined by the longitudinal wave velocity and its uniaxial compressive strength. The basalt samples have the strongest linear correlation between the initial damage of the rock defined by the static elastic modulus and its uniaxial compressive strength. The correlation between the initial damage of the rock defined by the Poisson’s ratio and its uniaxial compressive strength is poor, which is not suitable for measuring the initial damage degree of the rock.

Key words: Initial Damage of Rock, Uniaxial Compressive Strength, Correlation, Initial Damage Variables