表征真实骨料形态的三维数值骨料建模

发布时间：2018-05-07 19:27

本文选题：骨料形态 + Hurst指数　；参考：《建筑材料学报》2017年03期

【摘要】：利用图像处理技术将骨料截面轮廓处理为二值图像,识别出各独立轮廓的形态特征后获取Hurst指数值的统计学规律,并使用改进的分形布朗运动(FBM)生成随机的数值骨料截面轮廓.使用该轮廓作为垂直于构建轴线的三维骨料上下两部分的连接面,基于改进的随机中点位移法,分别建立三维骨料的上曲面和下曲面并组装成完整的三维骨料模型.按相同纵长比生成的数值骨料与真实骨料具有相近的轮廓、扁平比和球度,且随机生成的数值骨料样本库与实测的真实骨料样本库具有类似的体积分布规律.按级配生成数值骨料并投放生成圆柱形沥青混凝土数值试件,相同工况下的仿真结果与单轴压缩蠕变试验数据的趋势吻合.
[Abstract]:The aggregate cross-section profile is processed into binary image by image processing technology, and the statistical law of Hurst exponent value is obtained by recognizing the morphological characteristics of each independent contour, and the random numerical aggregate cross-section profile is generated by using the improved fractal Brownian motion (FBM). Based on the improved random midpoint displacement method, the upper and lower surfaces of the three dimensional aggregate are constructed and assembled into a complete 3D aggregate model by using the contour as the connecting surface of the upper and lower parts of the aggregate vertical to the construction axis, and based on the improved random midpoint displacement method, the above surface and the lower surface of the three dimensional aggregate are respectively established and assembled into three dimensional aggregate models. The numerical aggregate with the same longitudinal length ratio has similar contour, flat ratio and sphericity, and the random generated numerical aggregate sample bank has the similar volume distribution law with the measured real aggregate sample bank. The numerical aggregate is graded and the cylindrical asphalt concrete numerical specimen is put in place. The simulation results under the same working conditions are in agreement with the uniaxial compression creep test data.
【作者单位】：合肥工业大学土木与水利工程学院;合肥工业大学汽车与交通工程学院;中铁城市规划设计研究院有限公司市政所;
【基金】：安徽省住房城乡建设科学技术计划资助项目(2013YF-01) 国家自然科学基金资助项目(51008109,51408173)
【分类号】：TU528.041

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