基于图像处理技术的尾矿颗粒形态研究

发布时间：2018-05-13 09:54

  本文选题：采矿工程 + 尾矿颗粒形态　； 参考：《岩石力学与工程学报》2017年S1期

【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。
[Abstract]:The shape of particles in granular media determines the physical and mechanical properties of dielectric materials. In order to reveal the difference of physical and mechanical properties between tailings and natural sand from the micro level, four quantitative indexes of flatness, roundness, convexity and roughness were adopted through microscopic and image processing techniques, and gold and tin were selected. The grain morphology of four kinds of tailings such as copper and iron ore is compared with that of one kind of building river sand and one kind of sea sand. The results show that the flatness of tailings decreases with the increase of particle size, which indicates that the shape of tailings changes from needle-shaped (columnar) to spherical with the increase of particle size. The sea sand also presents this kind of change law. The roundness of tailings decreases with the increase of particle size, which indicates that the planar profile of tailings becomes more and more round with the decrease of particle size (from coarse to fine). The change of roundness between river sand and tailings is similar, but that of sea sand is opposite. The crown of tailings increases with the increase of particle size, which indicates that the surface angle of tailings decreases with the increase of particle size. The variation of the convexity of sea sand is similar to that of tailings. The roughness of tailings increases with the increase of particle size, and the variation of roughness of sea sand and river sand is similar. The ratio of horn-shaped and subhorn-like particles in tailings is higher. The angularity and roughness of tailings are higher than those of seashore sand and river sand.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室;东京大学土木工程系;
【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~~
【分类号】：TD926.4;TP391.41
，

本文编号：1882669