干滩表层沉积尾矿的细观几何特征研究

发布时间：2019-06-25 18:56

【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。
[Abstract]:In order to describe the geometric characteristics of sedimentary tailings on the surface of dry beach and its variation with sedimentary distance, the description method of meso-geometric characteristics of tailings particles is studied by means of microscopic experiments and theoretical analysis, and the variation trend of meso-geometric characteristics of tailings with sedimentary distance is analyzed. The results show that the meso-geometric characteristics of sedimentary tailings can be described by quantitative frequency distribution, area frequency distribution, roundness, grinding roundness and texture fractal dimension, 35 渭 m particle size is the boundary between micron particle size and non-micron particle size, and the geometric characteristics of the two kinds of particles are very different. The tailings deposition distance model shows that the tailings distribution on the dry beach is closely related to the particle size, initial slurry velocity and slope, and when the sedimentary tailings reaches the critical state, the critical state stress ratio is close to 1.4. The results reveal the grain size characteristics of sedimentary tailings on the surface of dry beach, which provides a reference for the multi-scale study and distribution of sedimentary tailings.
【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;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;石家庄铁道大学大型结构健康诊断与控制研究所;
【基金】：国家自然科学基金重点项目(51234004);国家自然科学基金资助项目(51004099);国家自然科学基金青年科学基金项目(51304088)~~
【分类号】：TD926.4

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