摘要
土体的微观结构对土的工程性质具有重要的影响.基于分形理论适合于研究复杂不规则图形的特点,介绍了分形理论在土体微观结构研究中的作用,定义了研究土体微观结构的平面分形维数.利用光学显微镜对不同应力路径三轴试验的土样进行孔隙大小及分布的对比研究.利用MATLAB语言编写程序,对土体微观结构图片进行了平面分维计算,分析了不同应力路径试验后土体微观结构的分形特征.分析结果表明,土样的微观结构具有分形特征,其平面分维在1.5～2.0之间;土体越松散,平面分维的数值越大.
The engineering character of soil is influenced greatly by its microstructure. Because the fractal theory is suitable for the study of complex and irregular structure, its functions of studying the microstructure of soil are introduced, and the plane fractal dimension used to study the microstructure of soil is defined. The pore size and distribution of soil in the different stress path tests were studied by the optical microscope. Then,the program was coded with MATLAB and the plane fractal dimension of microstructure figures of soil were calculated. The fractal character of soil was analyzed in the different stress path tests. The results show that the microstructure of soil has the fractal characteristic and the plane fractal dimension varies from 15 to 2.0. The looser the soil is, the larger the plane fractal dimension.
出处
《建筑科学》
北大核心
2005年第5期21-25,10,共6页
Building Science
基金
河北省自然科学基金资助项目(500045)
关键词
分形理论
微观结构
平面分维
fractal theory
microstructure
plane fractal dimension
