Abstract:In order to obtain the parameters of medium and long hole blasting in Tonglvsshan Copper Iron mine, based on Livingston blasting funnel theory, this paper deduces the theoretical formula of cylindrical charge suitable for medium and long hole blasting, and carries out a series of blasting funnel tests under certain conditions of ore, rock and explosive properties. The results show that the best central depth of charge is 0.42m, the best volume of blasting funnel is 0.016m3, the best radius of blasting funnel is 0.45m, and the minimum resistance is 0.79m. The optimum hole base distance of Tonglvshan Copper Iron Mine is 0.8~0.9m in the same section blasting funnel test. Based on the derivation formula of cylindrical charge blasting funnel, the optimal hole row spacing and hole bottom spacing are 1.62m and 1.65~1.85m respectively.
