Surface Characterization and Frictional Energy Dissipation Characteristics of Deep Granite Under High Stress Conditions

Abstract

Rockbursts are one of the most violent dynamic disasters in deep mining. New research has suggested that an energy theory-based approach may be useful for solving deep rockburst problems, and energy theory has been recognized as the most reasonable and effective method for understanding rock mechanics. Considerable efforts have focused on characterizing energy storage, energy dissipation and the energy of motion. However, existing research has not accurately represented frictional dissipated energy. In this paper, a shearing friction test was designed, and the frictional dissipated energy at different vertical stress levels was determined by calculating the area under the shear stress–strain curves. Fractal dimensions were used to express the roughness and waviness of the structural surfaces. In addition, to better understand the mechanisms producing this frictional dissipated energy, structural surfaces were examined using a binocular laser scanner before and after shearing friction tests. Analysis of the results indicates that frictional dissipated energy is controlled primarily by the macroscopic waviness. The mode of energy consumption changes from climbing to shearing with an increase in vertical stress, considering the simulated results.