极不稳固矿岩无底柱分段崩落采矿法崩矿步距优化数值模拟及应用  

Study on numerical simulation of caving step for optimization in pillarless sublevel caving method of extremely unstable rock and its application

作　　者：姜兆阳 郑浩田 蒲江涌 Jiang Zhaoyang;Zheng Haotian;Pu Jiangyong(Anhui Taiping Mining Co.,Ltd.;Center for Rock Instability and Seismicity Research,Northeastern University)

机构地区：[1]安徽太平矿业集团有限公司,235000 [2]东北大学岩石破裂与失稳研究所

出　　处：《黄金》2022年第6期35-39,共5页Gold

基　　金：国家自然科学基金联合基金项目(U21A20106)。

摘　　要：崩矿步距是无底柱分段崩落采矿法的核心参数,崩矿步距的确定对于降低采矿损失贫化具有重要意义。以太平矿业公司37-2^(#)矿体为研究对象,结合37-2^(#)矿体围岩赋存条件及矿脉形态,采用PFC^(2D)颗粒流数值模拟软件,建立了符合现场实际情况的采场数值模型,确定了放矿过程循环模拟的数值模拟方法。以矿石回收率为指标,通过比较不同工况下数值模拟结果,确定37-2^(#)矿体的崩矿步距为1.25~2.25 m,并进行了现场工业试验,确定了分段高度7 m时的最优崩矿步距为1.50 m,研究成果为现场生产施工提供了理论支持。The caving step is a core parameter of pillarless sublevel caving method, and determination of the caving step is important in reducing mining loss and ore dilution.The 37-2^(#)ore body of Taiping Mining Company was used as the research object, and the stope numerical modeling method of mining process cycle simulation was established by combining the occurrence conditions of rock and mineral vein morphology of 37-2^(#)ore body, using PFC^(2D)grain flow numerical simulation software, which fits the actual situation.Taking the ore recovery rate as an index, the caving step from 37-2^(#)ore body is determined to be 1.25-2.25 m by comparing the numerical simulation results under different working conditions, and an on-site industrial trial is conducted to determine the optimal step to be 1.50 m when sublevel height is 7 m, and the research results provide theoretical support for the on-site production construction.

关 键 词：PFC^(2D)软件 极不稳固矿岩 崩矿步距 无底柱分段崩落采矿法 矿石回收率 

分 类 号：TD853.36[矿业工程—金属矿开采]