Any rock mechanics’ design inherently involves determining the deformation characteristics
of the rock material. The purpose of this study is to offer equations for calculating
the values of bulk modulus (K), elasticity modulus (E), and rigidity modulus (G) throughout
the loading of the sample until failure. Also, the Poisson’s ratio, which is characterized
from the stress–strain curve, has a significant effect on the rigidity and bulk moduli.
The results of a uniaxial compressive (UCS) test on granitic rocks from the Morágy
(Hungary) radioactive waste reservoir site were gathered and examined for this purpose.
The fluctuation of E, G, and K has been the subject of new linear and nonlinear connections.
The proposed equations are parabolic in all of the scenarios for the Young’s modulus
and shear modulus, the study indicates. Furthermore, the suggested equations for the
bulk modulus in the secant, average, and tangent instances are also nonlinear. Moreover,
we achieved correlations with a high determination factor for E, G, and K in three
different scenarios: secant, tangent, and average. It is particularly intriguing to
observe that the elastic stiffness parameters exhibit strong correlation in the results.