Research on blasting mechanism and blasting effect of aqueous media in open pit coal mines

Abstract

The existing mining procedure for coal surface mining is perforation-blasting-mining-loading-transportation-disposal, in which the blasting link has problems such as low loading efficiency due to poor blasting effects and environmental pollution caused by the dust generated by blasting. This paper presents a detailed analysis of the mechanical characteristics of the aqueous media, its role in transferring energy during blasting, the role of the aqueous media in energy transfer, and the bubble pulsation phenomenon. The dynamic process of blasting was simulated with the help of TrueGrid/LS-DYNA finite element analysis software to study the changes in the maximum principal stresses at the perimeter of the hole, the top and the foot of the slope. Finally, blasting field tests were carried out in conjunction with actual mine production conditions. The dust reduction rate of aqueous media blasting reached 75%, and a comprehensive evaluation of two groups of traditional dry hole blasting and three groups of aqueous media blasting was carried out using the AHP-fuzzy comprehensive evaluation method.