关键词: 数字图像处理, 花岗岩, 细观结构, 变分水平集方法, C-V模型

Abstract: The geotechnical material’s actual mesostructure is significant in that its characteristics will largely affect its macroscopic mechanical behavior. With the digital image processing technology being more and more mature, the partial differential equations (PDE) method based on variation level set attracts increasing attention meanwhile finds increasingly more application in the field of image processing. C-V model, as a frequently used method, is a typical one among those using the PDE method. This paper deals with how to use C-V model combined with background filling technology to realize the three-phase split (feldspar, quartz and mica) of the granite pictures after the digital image of the rock has been got; thus to provide the conditions for further mechanical analysis. The purpose of quantifying the mesostructure of rock can be achieved by the method described in this paper, which ultimately can be used to get pictures that accurately reflect the internal characteristics of the rock, thus to provide real geometry model for finite element analysis in the future. The numerical value results indicate that the PDE method is very effective indeed. By selecting the appropriate number of iterations, it can get a higher quality of the rock mesostructure quantitative geometric images consistent with the real mesostructure images.

Key words: digital image processing, granite, mesostructure, variation level set method, C-V model