束状孔分层落矿采矿方法研究

针对球形药包分层崩落采矿法落矿分层厚度小、采场生产能力较低的问题，基于束状孔爆破理论，研发束状孔分层落矿采矿方法。束状孔爆破具有增强破岩作用的爆破效应。4～5个炮孔组成的束状孔，采用当量球形药包装药，爆破分层高度为单孔球形药包爆破的2～3倍。束状孔分层落矿采矿方法采用束状深孔当量球形药包漏斗爆破，束状炮孔间距7～8 m,采用普通工业炸药爆破。每次分层爆破落矿高度5～8 m,贫化率8%,损失率10%,大块率<5%,采场生产能力1 800～2 400 t/d。与单孔球形药包爆破VCR法比较，大块率降低10%～20%,采场生产能力提高1倍以上。束状孔分层落矿采矿方法是一种适用于厚大矿体、中厚急倾斜矿体的大规模高效开采方法。

Beijing Research Institute of Mining and Metallurgy, Dongguashan Copper Mine of Tongdu Copper Company. Research and application of high efficiency and safety blasting technology for large ore caving [R]. 2005. BeijingBunch-holes mining method I:Bunch-holes Crater Retreat(BCR)Mining Method

In response to the problem of small layered thickness and low production capacity of the subleve caving mining with spherical charge, based on the theory of bunch-holes blasting, the Bunch-holes crater retreat mining method (BCR) is developed. Bunch-holes blasting has the enhancing rock breaking effect. When using equivalent spherical charge (ESC) of a bunch-holes with 4-5 holes, the blasting layering height is 2-3 times that of a single hole. The BCR mining method uses equivalent spherical charge (ESC) crater for blasting with deep bunch-holes, and the spacing between bunch-holes is 7-8m, and the ordinary industrial explosives are used. Each layered blasting has a height of 5-8m. The dilution rate is 8%, the loss rate is 10%, the large block rate<5% and the production capacity is 1800-2400t/d. Compared with the single hole spherical charge blasting VCR method, the large block rate is reduced by 10-20%, and the stope production capacity is increased by more than twice. It is a large-scale and efficient mining method suitable for thick and large ore bodies, medium thick and steeply inclined ore bodies.