基于图像处理技术的石灰石机制砂形貌研究

发布时间：2018-04-22 17:26

本文选题：机制砂 + 形貌特征　；参考：《西南交通大学学报》2017年01期

【摘要】：为定量研究不同粒级石灰石机制砂形貌特征及规律,使用数码相机和体式显微镜采集了4.750~2.360、2.360~1.180、1.180~0.600、0.600~0.300、0.300~0.150 mm和0.150~0.075 mm共6个粒级石灰石机制砂的数字图像(每一粒级以500粒为样本容量);基于数字图像处理(digital image processing,DIP)技术,使用软件Image-Pro Plus定量测定了样本的圆度、轴向系数和球度,通过分形理论计算了石灰石机制砂的分形维数;对不同形貌特征进行统计分析,并和天然河砂的形貌参数作了对比.研究结果表明:不同粒级石灰石机制砂的圆度、轴向系数和球度分布基本符合正态分布;不同粒级机制砂或河砂的圆度、轴向系数、球度和分形维数变化具有良好的一致性,砂粒形貌特征可采用任意一种参数表征;石灰石机制砂的圆度、轴向系数和球度分别为0.834~0.857、0.693~0.705和0.793~0.799,分别低于河砂5.0%、7.2%和3.3%,分形维数为1.046~1.056,高于河砂3.2%;提出了机制砂整形过程中圆度、轴向系数、球度和分形维数的建议取值范围,分别为0.880~1.000、0.740~1.000、0.820~1.000和1.010~1.025.
[Abstract]:In order to quantitatively study the morphology and regularity of different grain-grade limestone mechanism sand, Digital images of 6 grained limestone machine-made sand (each grained with 500-grain) were collected using digital camera and pose microscope at 4.750 / 2.3602.360 / 1.180 / 0.600 / 0.600 / 0.300 / 0.300 / 0.300 / 0.300mm and 0.150/ 0.075mm, respectively. Based on digital image processing, digital image processing technique was used. The roundness, axial coefficient and sphericity of the sample were quantitatively measured by Image-Pro Plus, the fractal dimension of limestone machined sand was calculated by fractal theory, and the statistical analysis of different morphology characteristics was carried out, and the morphological parameters of natural river sand were compared. The results show that the roundness, axial coefficient and sphericity distribution of different grain-grade limestone machined sand basically accord with normal distribution, and the variation of roundness, axial coefficient, sphericity and fractal dimension of different grain-grade machined sand or river sand has good consistency. The roundness, axial coefficient and sphericity of limestone sand are 0.834 ~ 0.8570.693n 0.705 and 0.779 ~ (0.99), respectively, which are lower than those of river sand (5.0% and 3.3m), and the fractal dimension is 1.0461.056, which is higher than that of river sand 3.22.The roundness in the molding process of machine-made sand is put forward. The suggested ranges of axial coefficient, sphericity and fractal dimension are 0.880 / 1.000, 0.7401.000 / 0.820 / 1.000 and 1.010 / 1.025, respectively.
【作者单位】：西南交通大学土木工程学院;中铁二院工程集团有限责任公司;
【分类号】：TU521.1

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