(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 中南大學(xué) 國家重金屬污染防治工程技術(shù)研究中心，長沙 410083)
摘 要: 以赤泥堆場為研究對象，采用分形學(xué)理論，研究不同堆存年限赤泥團(tuán)聚體粒徑分布與赤泥理化性質(zhì)(容重、孔隙度、pH、電導(dǎo)率、可交換鹽基)的相關(guān)關(guān)系。結(jié)果表明:隨著堆存年限的增加，赤泥理化性質(zhì)得到一定程度的改善，赤泥團(tuán)聚體的穩(wěn)定性逐步增加；赤泥團(tuán)聚體分形維數(shù)為2.70~2.85，隨堆存年限的增加，赤泥團(tuán)聚體分形維數(shù)逐漸降低；赤泥團(tuán)聚體分形維數(shù)與赤泥理化性質(zhì)和團(tuán)聚體穩(wěn)定性均呈顯著相關(guān)性，表明分形維數(shù)能夠很好地表征赤泥的理化性質(zhì)和團(tuán)聚穩(wěn)定性。
關(guān)鍵字: 赤泥；赤泥堆場；分形維數(shù)；團(tuán)聚體；土壤化
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution,
Central South University, Changsha 410083, China）
Abstract:In order to quantitatively explore the physical structure of the residues, the fractal theory was used to measure the relationship between aggregate fractal dimension and physico-chemical properties of bauxite residues. The results show that, with the stacking age increasing, the physico-chemical properties are ameliorated, whilst the improvements in aggregates are observed. Under natural soil-forming processes, the fractal dimension decreases gradually, ranging from 2.85 to 2.70. The fractal dimension is positively correlated with bulk density, pH, electrical conductivity, and the exchangeable sodium percentage (r=0.862, r=0.819, r=0.915, and r=0.866, respectively; P＜0.01), and is negatively correlated with the porosity, the mean mass diameter ( ) and geometric mean diameter ( ) (r=-0.679, r=-0.956 and r=-0.944, respectively; P＜0.01). It is proposed that aggregate fractal dimension may be used as a new indicator to evaluate physical conditions, such as aggregate stability and erosion durability of bauxite residues.
Key words: bauxite residues (red mud); red mud yard; fractal dimension; aggregates; soil formation
