露天矿排土场散体岩石粒度分布的分形特征

应用分形几何理论研究了露天矿排土场散体岩石粒度分布的分维特征。研究表明:排土场岩石块度分布具有良好的分形结构,分维数大小随着排土场高度的增加而增加,但不超过3。当分形量测尺度一定时,分维数越大,散体中细颗粒含量越多,平均粒径也越小;当维数D一定时,粒级粗细将随分形量测尺度范围发生变化。分维数与散体剪切强度参数之间存在一定的相关关系。分维数是定量描述岩块粒度粗细含量的一个重要的参数,可用于排土场粒度资料的统计分析。图2,表3,参10。

Fractal characteristic of size distribution of bulky rock material in waste dump of open pit mines

The fractal characteristic of size distribution of bulky rock material in dumping site of open pit mines is studied by using fractal geometry theory. It is found that there is an excellent fractal structure of size distribution of bulky rock material in waste dump, the value of fractal dimension increases with the increasing height of waste pile,but it is not over 3. The results also shows that; if the fractal observing scale is unvaried, the contents of fine grain increases and the average grain-size decreases with the increasing value of fractal dimension; otherwise if the number of fractal dimension remains constant,the grain-size varies with the scope of fractal observing scale. There is a certain correlation between the values of fractal dimension and the shear strength parameters. The fractal dimension is an important parameter which can quantitatively express the rock material contents of different size, and can be used as measure in the rock size statistical analyzation of waste dump. 2figs. , 3tabs. ,10refs.