马登辉, 姚华彦, 王新志, 等. 2021.珊瑚砂颗粒形状特征分析[J].工程地质学报, 29(5): 1452-1459. doi: 10.13544/j.cnki.jeg.2021-0300.
    引用本文: 马登辉, 姚华彦, 王新志, 等. 2021.珊瑚砂颗粒形状特征分析[J].工程地质学报, 29(5): 1452-1459. doi: 10.13544/j.cnki.jeg.2021-0300.
    Ma Denghui, Yao Huayan, Wang Xinzhi, et al. 2021. Particle shape characteristics of coral sands [J]. Journal of Engineering Geology, 29(5): 1452- 1459. doi: 10. 13544/j.cnki.jeg.2021-0300.
    Citation: Ma Denghui, Yao Huayan, Wang Xinzhi, et al. 2021. Particle shape characteristics of coral sands [J]. Journal of Engineering Geology, 29(5): 1452- 1459. doi: 10. 13544/j.cnki.jeg.2021-0300.

    珊瑚砂颗粒形状特征分析

    PARTICLE SHAPE CHARACTERISTICS OF CORAL SANDS

    • 摘要: 珊瑚砂粒形状及粗糙度等微细观特性影响着砂土的宏观力学性质,采用图像处理技术对珊瑚砂粒的长宽比、面积、圆度、分形维数进行了分析。使用3D测量显微镜对砂粒的表面粗糙度,界面扩展面积比、峰顶点的算数平均曲率进行了测量计算。试验结果表明:大部分珊瑚砂颗粒的长宽比介于1.2~1.5之间,且长宽比呈现出负偏态分布。砂颗粒的圆度则主要集中于0.75~0.9区间,其表现为负偏态分布。砂颗粒的面积主要在0.015~0.035 cm2之间,颗粒面积为正偏态分布。砂粒的分形维数D基本介于1.04~1.10之间,表明砂颗粒具有很强的自相似性。粗糙度的分析结果表明,珊瑚砂颗粒表面平整度差,分布有较多的侵蚀坑,局部存在尖锐的凸起,砂粒表面粗糙度Sa为20.078 μm。界面扩展比Sdr为0.167,砂颗粒表面分布有若干倾斜面。峰顶点的算数平均曲率Spc为216.641 mm-1,显示出砂颗粒之间的接触较为尖锐。上述研究结果可为珊瑚砂宏微观力学特性研究提供参考。

       

      Abstract: The microscopic characteristics such as the shape and roughness of coral sand can affect the macro-mechanical properties of sand. Image processing technology is used to analyze the aspect ratio,area,roundness and fractal dimension of coral sand. 3D measuring microscope technology is used to measure and calculate the surface roughness of the sand grains,the interface expansion area ratio,and the arithmetic mean curvature of the peak apex. The test results show that the aspect ratio of most coral sand particles is between 1.2~1.5,and the aspect ratio presents a negative skew distribution. The roundness of sand particles is mainly concentrated in the range of 0.75~0.9,which shows a negative skew distribution. The area of sand particles is mainly between 0.015~0.035 cm2,and the area of the particles has a positive skew distribution. The fractal dimension D of sand particles is basically between 1.04~1.10,indicating that sand particles have strong self-similarity. The roughness analysis results show that the coral sand particles have poor surface flatness,with many erosion pits distributed,and sharp bulges locally. The sand surface roughness Sa is 20.078 μm. The interface expansion ratio Sdr is 0.167,and there are several inclined surfaces distributed on the surface of the sand particles. The arithmetic mean curvature Spc of the peak apex is 216.641 mm-1,which shows that the contact between sand particles is sharp. The above research results can provide references for the study of the macro and micro mechanical properties of coral sand.

       

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