摘要
深部地应力环境下矿岩体的力学性质及破碎特征与浅部矿岩体相比存在显著差异。为了优化铜绿山铜铁矿深部采场扇形中深孔爆破参数,在分析了铜绿山铜铁矿-485中段矿岩力学特性的基础上,在-485中段9428采场开展了系列爆破漏斗试验,并对爆破漏斗关键参数进行计算和分析。基于爆破漏斗形态和炸药单耗对中深孔爆破参数提出优化建议,并开展工业实验验证合理性。研究结果表明:铜绿山矿-485中段9428采场矽卡岩的完整性等级为较破碎;爆破漏斗试验药包中心最佳埋深L_(j)为0.400 m,临界埋深L_(e)为0.898 m,应变能系数E为1.69 m/kg^(1/3),最佳埋深比Δ_(0)为0.445,最佳爆破漏斗半径R_(j)为0.461 m,最佳爆破漏斗体积V_(j)为0.014 m^(3);试验最佳炮孔间距为0.809 m,爆破漏斗最小抵抗线为0.740 m;基于爆破相似理论可知,生产爆破孔径为64 mm时,扇形中深孔孔底距为1.3~1.6 m,孔口距为0.8~1.3 m,排距为1.1~1.4 m。
Under the deep geostress environment,ore-rock masses exhibit distinct mechanical properties and fragmentation characteristics that markedly differ from those observed in shallow deposits.To optimize the blasting parameters for fan-shaped medium-deep holes in the deep stope of Tonglushan Copper-Iron Mine,crater blasting tests were conducted at the 9428 stope of the-485 level,following a comprehensive analysis of the ore-rock mechanical properties at this depth.Optimized medium-length hole blasting parameters were systematically derived from a thorough analysis of crater morphology and specific explosive consumption characteristics,with subsequent industrial-scale trials confirming their technical validity and operational feasibility.The research findings demonstrate that the rock mass integrity coefficient of the skarn in the 9428 stope of the-485 level at Tonglushan Mine measures 0.39,classifying it as relatively fragmented according to the Standard for Engineering Classification of Rock Mass.Single-hole carter blasting tests revealed optimal parameters including:charge center burial depth(0.400 m),critical burial depth(0.898 m),strain energy coefficient(1.69 m/kg^(1/3)),optimal burial depth ratio(0.445),optimal crater radius(0.461 m),and optimal crater volume(0.014 m).Subsequent double-hole and inclined bench crater tests determined an optimal hole spacing of 0.809 m and a minimum crater burden of 0.740 m.Applying blasting similarity theory to production-scale fan-shaped medium-deep holes(64 mm diameter),recommended parameters include:hole bottom spacing(1.3~1.6 m),hole mouth spacing(0.8~1.3 m),and row spacing(1.1~1.4 m).
作者
熊国雄
刘天豪
尹东升
杨玉民
石德华
XIONG Guo-xiong;LIU Tian-hao;YIN Dong-sheng;YANG Yu-min;SHI De-hua(Tonglushan Cu-Fe Mine,Daye Nonferrous Metals Co,Ltd,Huangshi 435000,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《爆破》
北大核心
2026年第1期99-108,共10页
Blasting
基金
国家自然科学基金资助项目(41972286)。
关键词
深部开采
扇形中深孔
岩石力学特性
爆破漏斗试验
爆破参数
deep mining
fan-shaped medium-deep holes
rock mechanical properties
blasting crater test
blasting parameters
