Influence of Density on the Dynamic Properties of Intact Rock Masses

The determination of dynamic properties of geomaterials is essential from the point of view of many geotechnical engineering problems subjected to dynamic loading. The density of the geomaterial plays a vital role in deciding the dynamic properties and Poisson’s ratio of the material. In the present study, resonant column apparatus has been used for the laboratory testing of intact gypsum material to identify the influence of density on the dynamic properties of Poisson’s ratio of rocks. The experimental results showed that the unconfined compressive strength of the material increases exponentially with increased density. The reduction in the Poisson’s ratio and material damping ratio and a rise in the dynamic modulus have been observed with an increase in the density of the material. Furthermore, with the rise in the strain amplitude, the value of Poisson’s ratio and damping ratio increases, and the modulus value decreases. The study attempted to establish the correlation between the density and the dynamic properties of the material under varying strain amplitudes.