Effects of the Length–Diameter ratio on the dissipation energy in the process of rock deformation and failure

Abstract

Rock undergoing deformation and failure exhibit energy conversion to the testing equipment and the environment This study performed conventional uniaxial compression tests on granite specimens with different Length–Diameter ratios to study the relationship between the Length–Diameter ratio and the dissipation energy of rock during the deformation process. The test results show that the failure form of the specimen varies from vertical split to shear failure with increases in the Length–Diameter ratio. The compressive strength decreases with the increase of the Length–Diameter ratio. Moreover, a theoretical model was proposed for the same relation. The theoretical model was found to be in agreement with the experimental data. A new monotonically decreasing function was developed to relate the rock dissipation energy to the Length–Diameter ratio. The results demonstrate that the Length–Diameter ratio has no discernible influence on the deformation features before the peak strength; however, the influence is apparent after the peak strength.