南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (6): 10641074.doi: 10.13232/j.cnki.jnju.2018.06.002
林 銮1,陆武萍2,唐朝生1*,赵红崴2,冷 挺1,李胜杰1
Lin Luan1,Lu Wuping2,Tang Chaosheng1*,Zhao Hongwei2,Leng Ting1,Li Shengjie1
摘要: 土体微观结构是土体宏观力学机制的反映,深入研究土体微观结构对正确评价土体工程性质具有重要的指导意义. 针对松散砂性土的微观结构量化研究中存在的难题,提出了一整套样品制备方法和试验方法,基于数字图像处理技术,对土样的扫描电子显微镜图像(scanning electron microscope,SEM)进行了定量分析,并通过自主开发的程序实现了土样微观结构量化指标的快速获取和全自动处理. 采用该方法能对松散的砂性土制备出符合扫描电镜观测要求并同时保持原始结构不受扰动的试样,开发的程序能对土样的SEM图像进行去除多余信息、二值化、去噪、参数统计等预处理步骤,快速获取颗粒个数、面积、形态比、表观孔隙率、分形维数等微观结构量化指标. 借助统计学方法,对一些关键量化指标的分布特征进行了分析和探讨. 研究结果表明,计算机图像处理技术可以高效识别土体的颗粒和孔隙形态,进行土体微观结构参数的精确提取,从而为土体微观结构的定量分析提供了有效的途径.
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