Research on directional cast blasting: theoretical basis and construction practice

Abstract

This paper presents the theoretical basis and practical application of directional cast blasting in hydraulic and transport infrastructure construction within complex terrains. Based on the hydrodynamic theory of explosion and Pokrovsky's empirical formulas, the study analyzes key technical parameters such as the blasting action index (n), burden (W), and explosive charge calculations. Specifically, the research delves into non-electric differential blasting techniques to control peak particle velocity (PPV) and rock throw direction. Practical application results at the Cua Dat Reservoir (Thanh Hoa) demonstrate that this method ensures absolute safety for adjacent structures while optimizing costs and accelerating construction progress on high-hardness bedrock (f=10-14).