基于体视学原理砂土孔隙组构的图像分析

发布时间：2018-06-14 18:23

本文选题：孔隙组构 + 图像处理　；参考：《同济大学学报(自然科学版)》2017年03期

【摘要】：基于体视学原理定量描述孔隙组构的数学框架,采用归一化思想重新定义组构张量,提出了砂土孔隙组构描述的新方法.该方法用平面张量的第二不变量定义幅值参量来描述孔隙各向异性的大小,用其分量定义方向参量来描述各向异性方向,用这两个标量描述平面孔隙分布规律.采用多种图像处理技术消除砂样SEM图的一些干扰因素,优化得到清晰的二值化图像.砂样SEM图像分析表明:不同角度的平行测试线可以用于测量平均孔隙率,但无法测定其平面孔隙分布,环形测试线则可较好描述孔隙的空间分布规律.新方法用两个标量来描述平面孔隙分布,随孔隙空间几何关系变化,自然退化为现有张量的描述形式.图像分析验证了新方法描述的合理性.
[Abstract]:Based on the mathematical framework of quantitative description of pore fabric based on stereology principle, a new method for describing pore fabric of sandy soil is proposed by redefining fabric Zhang Liang with normalized idea. In this method, the amplitude parameter of the second invariant of the plane Zhang Liang is defined to describe the anisotropy of the pore, the direction parameter of the component is defined to describe the anisotropic direction, and the two scalar variables are used to describe the distribution of the pore in the plane. A variety of image processing techniques are used to eliminate some interference factors of SEM images of sand samples and to obtain clear binary images. The SEM image analysis of sand samples shows that parallel test lines with different angles can be used to measure the average porosity, but the plane pore distribution can not be measured, and the circular test lines can better describe the spatial distribution of the pores. The new method uses two scalars to describe the pore distribution in a plane. With the change of the geometric relationship of the pore space, the new method naturally degenerates into the description form of the existing Zhang Liang. Image analysis verifies the rationality of the new method.
【作者单位】：宁夏大学固体力学研究所;宁夏大学物理电气信息学院;
【基金】：国家自然科学基金(51368050,51669027) 宁夏自然科学基金(NZ13001) 宁夏科技支撑计划(2013)
【分类号】：TU441.3

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