软土路基微结构扫描电镜图像的分形  

Fractal approach on soft soil subgrade microstructure SEM image

作　　者：毛灵涛[1] 薛茹[2] 袁则循[3] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083 [2]郑州航空工业管理学院建筑工程管理系,河南郑州450015 [3]北京城市学院教育培训中心,北京100083

出　　处：《长安大学学报（自然科学版）》2007年第2期30-33,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家973计划重大项目(2002CB412701)

摘　　要：根据分形模型的构造方法,提出了用于描述软土孔隙变化的孔隙度分维、孔隙分布分维和孔隙边缘形状分维,并以珠江三角洲地区某高速公路软土路基加固为例,用分形维数对土体扫描电镜(SEM)图像进行分析。研究发现,加固后3种分形维数均有不同程度降低,表明加固后孔隙的分布面积减小,结构单元体之间排列紧密,孔隙尺寸分布趋于均匀,孔隙边缘形状变得规整光滑。结果表明,软土中孔隙分布及形状具有分形特征,不同的分形维数,可以从不同角度反映土体的加固效果及力学特性变化。Based on the creation of fractal model, three kinds dimensions, such as porosity density dimension, porosity distribution dimension and porosity edge shape dimension, are proposed to describe the variations of porosity in soft soil microstructure SEM image. Taking the highway subgrade reinforcement in Zhujiang Delta as an example, this paper analyzes the soil SEM image with fractal dimensions. According to the analysis, these dimensions of the reinforced soft soil diminish in different degrees, which indicate that the distribution area of porosity decreases, the structure units array more tightly, the porosity size distribution becomes uniform, and the edge of porosity turns smooth. All of these results disclose that the distribution and the shape of porosity have ffactal feature. Different fractal dimensions show the reinforced effectiveness and the feature variations of soil mass from different views. 1 tab, 4 figs, 15 refs.

关 键 词：道路工程 软土路基 土孔隙 土的微观结构 分形维数 图像处理 

分 类 号：U416.1[交通运输工程—道路与铁道工程]