ABSTRACT
Rock spalling is found to be closely related to strain bursting, the most common type of rockburst. In this paper, the spalling failure of long rock bars under different dynamic loads is numerically investigated using a particle-based numerical manifold method (PNMM). The thickness of the first and following spall pieces are studied. The values of spall strength at high loading rates are successfully simulated. The spalling patterns under decreasing, increasing, and symmetrical triangular waves are discussed and compared. Simulation results are valuable when considering the potential spalling failure of underground construction.
