摘要
散体介质中颗粒形状决定了介质材料的物理力学性质。为了从微细观层面揭示尾矿与天然砂土在物理力学性能方面的差异,通过显微与图像处理技术,采用扁平度、圆度、凸度和粗糙度等4个量化指标,选取金、锡、铜和铁矿等4种尾矿的颗粒形态与1种建筑用河沙和1种海沙的进行量化对比分析。研究结果显示,尾矿随着粒径的增大,扁平度减小,说明尾矿颗粒随着粒径的增大其形态由针状(片柱状)向球状变化。海沙也是呈现这样的变化规律。尾矿的圆度随着粒径的增大均呈现递减的变化规律,说明尾矿颗粒随着粒径的减小(由粗到细)其平面轮廓越来越趋近圆形。河沙与尾矿的圆度变化相近,海沙则相反。尾矿的凸度随着粒径的增加而增大,表明尾矿颗粒随着粒径的增大,其表面的棱角变少。海沙的凸度变化规律与尾矿的相似。尾矿的粗糙度随着粒径的增加而增大,海沙与河沙的粗糙度的变化规律与之相似。尾矿的角状和次角状颗粒所占比例均较高。尾矿颗粒的棱角性和粗糙度均高于海沙和河沙颗粒的。
The physical and mechanical properties of the dielectric materials mainly depend on shapes of particles in granular media. Therefore, in order to reveal the differences of physical and mechanical properties between tailings and natural sands, one of best ways is to use microscopy and image processing technologies to quantify four indicators （flatness, roundness, convexity and roughness） which can well quantify the shapes of particles. In this research, four tailings （gold, tin, copper and iron） and two natural sands （river sand and sea sand） are selected for such comparison. Results show that： （1） the flatness of tailings and sea sands decrease with the increase of particle size, which means tailings or sea sands with needle shapes tend to be spherical. （2） The roundness of tailings and river sands decrease with the increase of particle size, which also indicates the shapes of tailings and rover sands tend to spherical shapes. However, the roundness of sea sands decrease with the increase of particle size： （3） The convexity of tailings and sea sands increase with the increase of particle size, which indicates that angularity of tailings and sea sands surface reduce with the increase of particle size. （4） The roughness of tailings, river and sea sands increase with the increase of particle size.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2017年第A01期3689-3695,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(11372363)
江西省"赣鄱英才555工程"的资助项目~~
关键词
采矿工程
尾矿颗粒形态
形状参数
图像处理
mining engineering
shopes oftailings particles
shape parameter
image processing
