Abstract
ABSTRACT Since potential disturbance of a near-field host rock could adversely affect the stability of underground openings and could possibly change the properties of rock mass, it is very important to evaluate deformation and fracturing characteristics of rock. In this study, PFC2D modeling as well as laboratory experiments were carried out to study characteristics of deformation and fracturing of rocks under uniaxial and triaxial compressive conditions. Laboratory experiments include stress-strain measurements and acoustic emission measurements to carry out the moving point regression analysis. Damage thresholds showed linear relationships with confining pressures. In addition, the feasibility of the application of the bonded-particle model to reproduce mechanical behaviors of rocks was explored by comparing model behaviors to results from experiments at different confining pressures. The model could exhibit macroscopic behaviors such as strain softening, dilation and fracture that arise from extensive microcracking throughout a bonded assembly. However, axial stress increments with increasing confining pressures were much smaller than those from experiments.
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