本文選題：采礦工程 + 尾礦顆粒形態(tài)　； 參考：《巖石力學與工程學報》2017年S1期

【摘要】：散體介質中顆粒形狀決定了介質材料的物理力學性質。為了從微細觀層面揭示尾礦與天然砂土在物理力學性能方面的差異,通過顯微與圖像處理技術,采用扁平度、圓度、凸度和粗糙度等4個量化指標,選取金、錫、銅和鐵礦等4種尾礦的顆粒形態(tài)與1種建筑用河沙和1種海沙的進行量化對比分析。研究結果顯示,尾礦隨著粒徑的增大,扁平度減小,說明尾礦顆粒隨著粒徑的增大其形態(tài)由針狀(片柱狀)向球狀變化。海沙也是呈現這樣的變化規(guī)律。尾礦的圓度隨著粒徑的增大均呈現遞減的變化規(guī)律,說明尾礦顆粒隨著粒徑的減小(由粗到細)其平面輪廓越來越趨近圓形。河沙與尾礦的圓度變化相近,海沙則相反。尾礦的凸度隨著粒徑的增加而增大,表明尾礦顆粒隨著粒徑的增大,其表面的棱角變少。海沙的凸度變化規(guī)律與尾礦的相似。尾礦的粗糙度隨著粒徑的增加而增大,海沙與河沙的粗糙度的變化規(guī)律與之相似。尾礦的角狀和次角狀顆粒所占比例均較高。尾礦顆粒的棱角性和粗糙度均高于海沙和河沙顆粒的。
[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.
【作者單位】： 重慶大學煤礦災害動力學與控制國家重點實驗室;重慶大學復雜煤氣層瓦斯抽采國家地方聯合工程實驗室;東京大學土木工程系;
【基金】：國家自然科學基金資助項目(11372363) 江西省“贛鄱英才555工程”的資助項目~~
【分類號】：TD926.4;TP391.41
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本文編號：1882669