Numerical investigation on crack propagation and coalescence induced by dual-borehole blasting

Dynamic directional fracture of dual-borehole blasting is very vital to the rock fragmentation and final contour of some projects, such as the tunnel and slope. In this paper, a rock-like material, polymethyl methacrylate (PMMA), is utilized to explore the effects of borehole distance d, delayed time td, and guide hole type on crack propagation behavior under dual-borehole blasting through numerical simulations. To improve the deficiency of...