固化对淤泥结构单元体多重分形特性的影响

Effect of solidification on multifractal characteristics of silt structural unit

为了更深入地考察淤泥的分形特性以及固化处理对淤泥分形特性的影响,以武汉市官桥湖淤泥为例,在分析淤泥扫描电镜图像的基础上,采用Matlab编程研究淤泥单元体的多重分形特性,并探讨水泥和粉煤灰固化对淤泥多重分形特性的影响,考察了多重分形参数与淤泥强度特性之间的关系.结果表明:淤泥单元体在一定像素尺度范围内具有多重分形特性,多重分形谱呈不对称的左钩状;多重分形谱能反映单元体的分布特征,固化处理使淤泥单元体结构分布均匀;容量维、信息维、关联维、多重分形谱宽和非对称系数与无侧限抗压强度关系密切,可用多重分形参数反映强度变化的规律.

In order to further examine the fractal characteristic of silt and the influence of solidification on fractal property ,taking silt in Guanqiao Lake of Wuhan city as an example ,the multifractal of silt structural unit body was investigated using Matlab based on the analysis of scanning electron micro-scope images . The influence of cement and fly ash solidification on multifractal property was dis-cussed .The relationship between multifractal parameters and unconfined compressive strength was explored .The results show that silt structural unit body has the characteristic of multifractal within a certain range of pixels .Multifractal spectrum is asymmetrical and it shows a left hook shape .Multi-fractal spectrum can reflect the distribution characteristic of silt structural unit body and the distribu-tion becomes uniform after solidification .The capacity dimension ,information dimension ,correlation dimension ,spectrum width and asymmetric coefficient have strong relationship with unconfined com-pressive strength . The multifractal parameters can reflect the change of unconfined compressive strength .