(1. 中南大学 冶金与环境学院，长沙 410083；
2. 中南大学 国家重金属污染防治工程技术研究中心，长沙 410083)
摘 要: 以赤泥堆场为研究对象，采用分形学理论，研究不同堆存年限赤泥团聚体粒径分布与赤泥理化性质(容重、孔隙度、pH、电导率、可交换盐基)的相关关系。结果表明:随着堆存年限的增加，赤泥理化性质得到一定程度的改善，赤泥团聚体的稳定性逐步增加；赤泥团聚体分形维数为2.70~2.85，随堆存年限的增加，赤泥团聚体分形维数逐渐降低；赤泥团聚体分形维数与赤泥理化性质和团聚体稳定性均呈显著相关性，表明分形维数能够很好地表征赤泥的理化性质和团聚稳定性。
关键字: 赤泥；赤泥堆场；分形维数；团聚体；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
