摘要
根据分形几何学理论，研究了我国黄河及陕西省的石头河、冯家山古河道河床天然沉积砂卵石的粒度成分特征，发现在双对数坐标下粒度含量与粒径之间呈直线关系，表明粒度分布具有分形结构，根据直线的斜率ｂ，由公式Ｄ＝３－ｂ可求得相应的分维。计算所得的分维在２．５５～２．８７之间，并讨论了分维与粗粒土级配的关系。
The granularity characteristics of matural sedimentary sandy graval cobble under Yellow river and Stone River.Fengjiashan Ancient River in Shaanxi Province are studied according to the fractal geometry.It is found that there is a linear relationship between the accumulative granularity content and the grain size in log-log plot,and it's slope b can be used to calculate the relative fractal dimension D by the equation D=3-b.Results show that the D of natural sedimentary sandy gravel cobble under River changes from 2.55 to 2.87.Gorrelations between fractal dimension and gradation of coarse grained soil are discussed.It is conclued that the fractal dimension can be used as one index instead of both uniformity coefficient (C u) and coefficient of currature (C c)to describe the gradation of coarse grained soil.
出处
《西北水资源与水工程》
1996年第4期26-31,共6页
Northwest Water Resources & Water Engineering
