Physical and mathematical analysis of the multistage blast rock fragmentation process

Source abstract

The article examines dynamics of the transition from high intensity shock action caused by detonation of the explosive to the quasi-static expansion of the cavity formed by the explosion products. The main focus is placed on the formation mechanisms of the damage zone, i.e. creation of the blast cavity, fragmentation, and crack initiation. The study looks closely at the key role of acoustic matching at the explosive–rock interface through the wave impedance concept, as well as development of the compression wave within the rock mass. The presented physical and mathematical tools create a scientific foundation for optimizing blasting technologies. Targeted selection of the explosive type, charge design, and blasting system based on analyzing wave and strength processes makes it possible to increase the energy efficiency of the blast, control the particle size distribution in the muck pile, and minimize negative impacts, e.g. seismic effects, over-crushing).