Research and application of interval detonators with water-rich deep hole blasting in open-pit coal mines
In order to solve the problem that water-rich gun holes encountered in open-pit mining cannot be installed with air spacers for spaced charge blasting,a special spacer for water holes was developed on the basis of analyzing the applicability and structure of air spacers,which is used to reduce the use of emulsion explosives.The expansion effect of the water hole spacer and supporting effect on the emulsion explosives,and the influence on the blasting effect were studied by means of ground experiments and on-site inspections.The results show that the water hole spacer is applied in water-rich deep hole blasting,the situation of the burst pile after blasting,the rate of large pieces and the root after shoveling are comparable with the surrounding non-spaced charge blasting,which realizes the reduction of cost and increase of efficiency.
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