中深孔爆破成井在逊克金矿的应用

Application of shaft sinking by medium-long hole blasting in Xunke Gold Mine

逊克金矿采用Simba1354凿岩台车施工切割井中深孔,对掏槽方式、炮孔直径、施工精度、装药结构、爆破次数进行了优化,选择桶形掏槽提供自由面和补偿空间,120 mm大直径炮孔减小穿孔数量,导向钎杆提高了施工精度。通过提高装药密度和增加导爆索等措施改善爆破效果,通过分次爆破减少了天井被堵死的概率。采用该方法成功实施了中深孔爆破成井,提高了生产效率,降低了天井掘进存在的炮烟、粉尘、浮石等安全风险,保证了采出矿量和各生产矿块的生产接续,为工程进展提供了有力保障,可为同类矿山的开采提供借鉴经验。

Xunke Gold Mine innovatively adopts Simba1354 jumbos to drill medium-long holes in cutting shafts and optimizes the cutting manner,borehole diameter,construction precision,charge structure,and blasting times.Barrel-shaped cutting is chosen to offer a free face and compensation room.120 mm large-diameter boreholes can lead to fewer perforation numbers.Guiding drill rod improves construction precision.The blasting effect was improved by increasing the charge density and adding detonating cords,and the probability of raise blocking was reduced by sub-blasting.Medium-long hole blasting was successfully implemented with this method,which improved the production efficiency and reduced the safety risks such as blasting smoke,dust,and pumice in the excavation of the raise.The mining output and the production continuity of each production ore block are ensured,which provides a powerful gua-rantee for the progress of the project.The method provides references and experience for mining in similar mines.