Estimation of physical and mechanical properties of rocks plays crucial role in designing of mining and civil engineering projects. Determination of these properties using direct methods i.e., laboratory determination is very expensive and time consuming in most cases despite having the high accuracy. Moreover, preparing core samples to perform direct tests is extremely difficult and needs double precision. For this reason, indirect and non-destructive methods can be utilized as suitable alternatives to determine rock properties. In this paper, the relationships between the different physico-mechanical properties of intact rocks with P-wave velocity have been investigated. For this purpose, rock samples of schist, phyllite, and sandstone were firstly collected from drilling operation in Marivan Azad dam site of Iran. Then, different physio-mechanical properties of core samples including uniaxial compressive strength, modulus of elasticity, porosity, Poisson's ratio, slake durability index, density, water absorption and P-wave velocity were determined in dry and saturated conditions in the laboratory. Based on the statistical analysis, linear, logarithmic, polynomial, exponential and power equations between the above parameters and P-wave velocity were investigated. An equation with very high determination coefficient (R2) was proposed as best equation to determine each of the above properties based on the P-wave velocity index. To validate the proposed empirical equations, obtained results were compared with the measured data which was not incorporated in equations development. Finally, comparison from the obtained results showed that physical and mechanical properties of rock have higher correlation with the P-wave velocity in saturated and dry conditions, respectively.
