中文摘要：

为了从细观上描述干滩表层沉积尾矿的几何特征及其随沉积距离的变化,采用显微实验和理论分析,研究尾矿颗粒细观几何特征的描述方法,分析尾矿细观几何特征随沉积距离的变化趋势。结果表明：沉积尾矿的细观几何特征可以用颗粒粒径的数量频率分布图、面积频率分布图、圆形度、磨圆度和织构分维数进行描述;35μm粒径是划分微米级颗粒和非微米级颗粒的界限,2种粒径的颗粒在几何特征上有很大差别;尾矿沉积距离模型表明在干滩上的尾矿分布与粒径、初始矿浆流速和坡度等因素密切相关;当沉积尾矿达到临界状态时,临界状态应力比接近1.4。研究结果揭示了干滩表层沉积尾矿的粒形粒径特征,为沉积尾矿多尺度研究和分布规律提供参考。

英文摘要：

The microscopic geometrical characteristic of the surface sedimentary tailings is described in this paper. Microscopic experiment and theoretical analysis were used to research the microscopic geometric characteristics of tailings and the effect of distance on microscopic geometric characteristics. Some charts and indicators were used to describe the microscopic geometric characteristics,such as the number or area frequency distribution histogram of grain size,circularity,roundness and textural fractal dimension. Tailings grains according to their microscopic geometrical characteristics were divided into the micron-sized grains and the non-micron grains with the boundary of 35 μm. The derived formula showed that the distribution of surface sedimentary tailings was affected by the grain size,initial flow velocity,gradient,etc. The stress ratio was 1.4 when tailings reached the critical state.