Research on optimization of dual-point detonation positions in fan-shaped deep holes in broken ore bodies
In the mining of fractured ore bodies using the sublevel caving method,brow failure is a common issue that not only affects subsequent blasting operations but also severely restricts safe and efficient production on site.To address this problem,a study was conducted using the 1280 sublevel recovery roadway of the Jiandashan Iron Mine as a case study.The research utilized field surveys,numerical simulations,and theoretical analysis to investigate the distribution pattern of detonation stress fields under different initiation points in double-point initiation.A comprehensive evaluation of the spatial distribution of explosion energy and blasting effectiveness under different initiation positions revealed that adjusting the initiation position appropriately can modify the distribution pattern of the detonation stress field within the ore body,thereby reducing the stress impact on the brow area.Field test results confirmed that when the charge is positioned at 1/2 of the charging section to the hole bottom during double-point initiation,it enhances the destructive effect on the upper ore body while mitigating the impact on the brow area,effectively protecting the brow.
sublevel caving method without pillarnumerical simulationtwo point detonationinitiation positioneyebrow line breakage
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