Study on Geometry Characteristics of Railway Ballast Based on 3D Image

被引：0
|
作者：
Chang J. [1 ,2 ]
Li T. [2 ]
Lan T. [2 ]
Feng H. [1 ]
机构：
[1] State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang
[2] Key Laboratory of Roads and Railway Engineering Safety Control, Shijiazh Tiedao University, Shijiazhuang
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2023年 / 45卷 / 12期
关键词：
3D image; ballast; comprehensive local index; geometry character; specific surface area;
D O I：
10.3969/j.issn.1001-8360.2023.12.017
中图分类号：
学科分类号：
摘要：
The geometric form of the ballast has an important influence on the physical and mechanical properties of track bed. The quantification and study of the geometric shape characteristics of ballast are not only conducive to the mechanism and simulation analysis, but also can provide support for the maintenance of ballast bed. In this paper, based on the characteristics of 3D images of particles, a new evaluation parameter, synthetic local feature coefficient, was proposed. The validity of the coefficient was proved by test. Combined with the overall shape characteristic parameters, the geometric distribution of ballast particles was statistically analyzed from the overall and local levels. In addition, the specific surface area was analyzed. The study of the distribution law of the specific surface area of ballast particles is helpful to analyze the particle interaction and energy utilization efficiency. The results show that the dimension deviation of flat ballast is the largest in terms of 3D size. With the increase of particle size, the dimension deviation of cubic ballast gradually increases, the flat ballast gradually decreases and the elongated ballast remains unchanged. In terms of overall shape, the shape of cubic ballast is closest to spherical. With the increase of particle size, the overall shape of flat ballast tends to spherical while the overall shape of cubic and elongated ballast is basically unchanged. In terms of local characteristics, the elongated ballast is the most significant. With the increase of particle size, the local characteristics of the three types of ballast all become obvious. The specific surface area of ballast particles is related to the 3D particle size. With the increase of 3D particle size, the specific surface area of ballast decreases, and the flat ballast decreases at a higher rate. © 2023 Science Press. All rights reserved.
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页码：157 / 164
页数：7
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