Abstract
This paper attempts to disclose the law of shock wave formation and propagation and the time history of the impact pressure on blasthole wall during the blasting with radial uncoupled charge of No. 2 rock emulsion explosive (No. 2 REE). For this purpose, the author carried out an analysis by shock tube theory, as well as model blasting experiments on concrete thick-walled cylinders, and then investigated the relationship between the peak impact pressure and the radial uncoupling coefficient (RUC) of the air space. The research results show that, when the RUC fell within the range of K = 1.50–3.50, the impact pressure was uniformly distributed, leading to a longer action time and much weaker blasting vibration than those of coupled charge; with the gradual growth of the RUC, the initial impact pressure presents a trend of increasing first and then decreasing slowly.
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