Effect of loading rate on the mechanical response and energy evolution of skarn rock subjected to constant-amplitude cyclic loading

Abstract

This work aims to reveal the mechanical responses and energy evolution characteristics of skarn rock under constant amplitude-varied frequency loading paths. Testing results show that the fatigue lifetime, stress-strain responses, deformation, energy dissipation and fracture morphology are all impacted by the loading rate. A pronounced influence of the loading rate on rock deformation is found, with slower loading rate eliciting enhanced strain development, alongside augmented energy absorption and dissipation. In addition, it is revealed that the loading rate and cyclic loading amplitude jointly influence the phase shift distribution, with accelerated rates leading to a narrower phase shift duration. It is suggested that lower loading rate leads to more significant energy dissipation. Finally, the tensile or shear failure modes were intrinsically linked to loading strategy, with cyclic loading predominantly instigating shear damage, as manifest in the increased presence of pulverized grain particles. This work would give new insights into the fortification of mining structures and the optimization of mining methodologies.

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