Numerical simulations of failure characteristics of rock materials under blasting loads using the conjugated bond-pair-based peridynamics

Abstract

Peridynamics is a new meshfree numerical method based on the nonlocal continuum theory. To overcome the limitation of fixed Poisson's ratio in the standard bond-based peridynamics, the conjugated bond-pair-based peridynamic model is developed to simulate rock fracture characteristics under blasting loads. The microscopic parameters in the conjugated bond-pair-based peridynamic model can be calibrated by the equivalent relation between the strain energy density at both macroscopic and microscopic scale. In addition, the strain energy stored in the bond is implemented into the fracture criteria to simulate the crack initiation, propagation and coalescence. Three numerical simulation examples show that the present numerical algorithm effectively simulate the failure characteristics of rock materials under the impact loads. It can be found that the present numerical results are in good agreement with the previous experimental observations and the previous numerical predictions, which demonstrate that the proposed numerical method can simulate and predict the failure mode and failure characteristics of rocks subjected to blasting loads.