摘要
为深入探究急倾斜极薄矿脉不同含水量矿岩放矿过程的流动特性,从而优化采矿工艺、提高资源回收率,采用物理试验和数值模拟相结合的方法,构建全尺寸急倾斜极薄矿脉受限空间放矿数值模型。通过对不同含水量矿岩进行安息角标定试验,确定离散元模拟参数。开展全尺寸放矿数值模拟,分析不同含水量矿岩在不同放矿高度下的放矿特性。结果表明,矿岩颗粒含水量对矿岩流动特性影响显著,矿岩含水量为4%时,放矿流动性最佳、流量大且稳定,呈“先进先出”流态;随着含水量的增加,流动性畸变,逐渐转为“先进后出”流态,放矿流量降低,无法满足多放矿口同时作业要求。此外,矿岩含水量为4%时,放矿高度对矿岩颗粒流动性影响较小,随着含水量的增加,放矿高度的增加会使高位置颗粒流动性变差,含水量为15%时,颗粒流动性严重恶化。
To further investigate the flow characteristics of the ore drawing process of ore-rock with different water contents in steeply inclined extremely thin veins,so as to optimize mining processes and improve resource recovery rates,a combined method of physical tests and numerical simulation was adopted,and a full-scale numerical model of ore drawing in confined space for steeply inclined extremely thin veins was established.Through repose angle calibration tests on ore-rock with different water contents,the discrete element simulation parameters were determined.Full-scale numerical simulations of ore drawing were carried out,and the ore drawing characteristics of ore-rock with different water contents under different ore drawing heights were analyzed.The results show that the water content of ore-rock particles has a significant impact on the flow characteristics of ore-rock.When the water content of ore-rock is 4%,the ore drawing fluidity is optimal with a large and stable flow rate,and it exhibits a"first-in first-out"flow regime.As the water content increases,the ore drawing fluidity distorts and gradually transitions to a"first-in last-out"flow regime,while the ore drawing flow rate decreases,failing to meet the requirements for simultaneous operation of multiple ore drawing outlets.In addition,when the water content of ore-rock is 4%,ore drawing heights have a relatively small impact on the fluidity of ore-rock particles.As the water content increases,the increase in ore drawing heights worsens the fluidity of particles at higher positions,and when the water content is 15%,the particle fluidity deteriorates severely.
作者
熊有为
郭钦鹏
XIONG Youwei;GUO Qinpeng(CINF Engineering Co.,Ltd.,Changsha,Hunan 410019,China;Hunan Provincial Engineering Research Center for Safe and Efficient Mining Technology of Deep Mines,Changsha,Hunan 410019,China)
出处
《矿业研究与开发》
北大核心
2025年第12期48-56,共9页
Mining Research and Development
基金
湖南省科技创新计划资助项目(2023RC3237)。
关键词
急倾斜极薄矿脉
受限空间放矿
参数标定
流动特性
数值模拟
Steeply inclined extremely thin vein
Ore drawing in confined space
Parameter calibration
Flow characteristic
Numerical simulation
