Particle Crushing and Energy Dissipation of Saturated Broken Gangue under Compaction

A detailed understanding of particle crushing, which changes particle size distribution and influences the energy dissipation of broken rocks, is extremely important to underground engineering, such as the prevention of dynamic hazards caused by hard roof. We have studied particle crushing and energy dissipation of the saturated broken gangue under variable axial stresses (2, 4, 8, 12 and 16 MPa). Testing results indicate that particle crushing was pervasive and mainly contained fracture, attrition and abrasion. 4 MPa was a critical axial stress for describing particle size distribution, compaction deformation and energy dissipation under compaction. Axial strain was an effective parameter to describe the particle crushing state. In general, both the axial strain and strain energy density were influenced by the initial gradation. A larger Talbot exponent corresponds to a larger axial strain and a smaller strain energy density.