基于SEM图像的既有地基红黏土颗粒微观结构及分形特征研究

Microstructure and fractal characteristics of red clay particles in existing foundation based on SEM images

采用IPP(Image-ProPlus)图像分析软件对贵州省贵阳市某工厂三种既有地基红黏土SEM图像的信息进行提取和处理,定性描述和定量分析土体的微观结构,并引入分形理论分析SEM图像,提出在IPP软件中获取颗粒三维分形维数的计算方法。结果表明:(1)抗剪强度参数随微观颗粒数、颗粒形态比的增大而增大,随颗粒平均面积的增大而减小;(2)颗粒分布及形态均具有明显的分形特征,分形维数介于2~3之间,抗剪强度参数均随颗粒分布及形态分维值的增大而增大;(3)与构建三维模型的方法相比,利用IPP软件计算土颗粒三维分形维数的方法具有可行性,简单易操作,结果可靠。

The IPP(Image-Pro Plus)software was used to extract and process the information of SEM images of three kinds of existing red clay in a factory,Guizhou Province,which helps to make qualitative description and quantitative analysis to the microstructure of the soil from the study site.In addition,the fractal theory is applied to analyze the SEM images,and the method of calculating the three-dimensional fractal dimension of particles in the IPP software is proposed.The results show that,(1)The parameters of shear strength increase with the growing number of microparticles and the ratio of particle morphology,and decrease with the average area of particles.(2) The distribution and morphology of particles have obvious fractal characteristics,with fractal dimensions between 2 and 3.The parameters of shear strength increase with the increase of particle distribution and fractal dimension of particle morphology.(3)It is feasible to use the IPP software to calculate the three-dimensional fractal dimension of soil particles.Compared with the method of building three-dimensional models,this method is simple and easy to use,and its analysis results are reliable.