ABSTRACT
To accurately reveal the progressive failure of rock pillars, the elastic-plastic damage process of rock needs to be considered. In this study, a bond-based peridynamics model is proposed, which considers the elastic-plastic damage process of rock by introducing a stiffness weakening coefficient of bonds. Following an evaluation of the proposed method in comparison to experimental findings, a series of simulations were conducted to comprehensively examine the impact of diverse factors on the mechanical properties and progressive damage characteristics of hard rock pillars in deep mining. These factors included the depth of burial and the width-to-height (W/H) ratio of rock pillars. The findings demonstrate that the depth of burial exerts an influence on the pre-peak energy of rock pillars through its effect on the restraining action, while the W/H ratio affects both the pre-peak and post-peak energies through its impact on the failure mode.
