Blasting mechanics

Abstract

This research provides an empirical approach toward further analysis of the variables in rock breakage under direct, hydroimpact (impacting on fluid) and explosive impulse loading. That the strain on the face of block of rock, below an impact pin or explosive charge, is directly proportionate to the rupturing force F and inversely proportionate to the product of the burden W and the hole periphery S, is borne out in the laboratory using electrical resistance strain gages to measure a peak strain during rupture by small explosive charges detonated in boreholes. Such findings have established the validity of the interrelationship of values F, W, and S that can have practical applications in commercial rock blast design.