Construction and evaluation index of rough surface of pavement of ballastless track structure in urban rail transit

被引：0
|
作者：
Chen X. [1 ]
Peng J. [1 ]
Jiang X. [2 ]
Wang Y. [3 ]
Wang M. [1 ]
Liu Y. [3 ]
Guo S. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] Shenzhen Urban Transport Planning Center Co., Ltd., Shenzhen
[3] Xinyun Engineering Co., Ltd. of China Railway First Group Co., Ltd., Xianyang
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Evaluation index; Paved layer; Rough surface; Slab track structure; Urban rail transit;
D O I：
10.11817/j.issn.1672-7207.2020.08.006
中图分类号：
学科分类号：
摘要：
To study the influence of paving layer roughness on the mechanical properties of slab ballastless track structure of urban rail transit and its reasonable design value, firstly, on the basis of W-M fractal function, the fractal rough surface with high randomness was constructed by Python programming, the fractal rough surface was imported into the Geomagic DX software, and the 3D rough surface solid model was generated by patching and other operations. Then, the three-dimensional rough surface solid model was imported into ABAQUS finite element software as component. On this basis, the finite element model of urban rail transit slab ballastless track with rough paving layer was constructed. Finally, the quasi-static finite element simulation calculation was carried out on the finite element model of slab ballastless track of urban rail transit with the load and boundary conditions in line with the actual situation. The displacement and stress response of the rail, track slab and base and other track structural components were obtained, and the mechanical response obtained was compared with the relevant literature for verification. The results show that the track structure without elastic cushion is difficult to meet the service requirements. When the characteristic constant G is constant, the response of all parts of the track structure increases with the increase of fractal dimension D, showing a significant positive correlation. When G is 0.004 m and D is 2.1, the displacement of the track plate exceeds the relevant limit. Considering the safety and simplicity of operation on site, the amplitude of roughness measurement curve should not be greater than 3 mm. © 2020, Central South University Press. All right reserved.
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页码：2102 / 2110
页数：8
相关论文
共 22 条
  • [11] MANDELBROT B., How long is the coast of Britain? statistical self-similarity and fractional dimension, Science, 156, 3775, pp. 636-638, (1967)
  • [12] SAYLES R S, THOMAS T R., Surface topography as a nonstationary random process, Nature, 271, 5644, pp. 431-434, (1978)
  • [13] BOWDEN F P, TABOR D, PALMER F., The friction and lubrication of solids, American Journal of Physics, 19, 7, pp. 428-429, (1951)
  • [14] GREENWOOD J A, WILLIAMSON J B P., Contact of nominally flat surfaces, Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, 295, 1442, (1966)
  • [15] MAJUMDAR A, BHUSHAN B., Role of fractal geometry in roughness characterization and contact mechanics of surfaces, Journal of Tribology, 112, 2, pp. 205-216, (1990)
  • [16] CHEN Hongxu, DONG Guanhua, XIE Luofeng, Et al., A piecewise calculation model for fractal rough surface contact deformation, Journal of Shanghai Jiao Tong University, 52, 6, pp. 722-728, (2018)
  • [17] CHEN Jianjiang, YUAN Yuan, CHENG Yu, Et al., Scale dependent normal contact stiffness fractal model of joint interfaces, Journal of Mechanical Engineering, 54, 21, pp. 127-137, (2018)
  • [18] LIU Yu, DENG Hongsheng, ZHANG Shengfang, Et al., Research on friction heat generation of three dimensional rough surface based on W-M fractal function, Chinese Journal of Construction Machinery, 16, 3, pp. 194-201, (2018)
  • [19] FENG Lanlan, Fractal simulation and contact features of rough surfaces in line contact, College of Civil Engineering and Architecture, pp. 15-40, (2015)
  • [20] HUANG Hua, XU Kai, HE Peisong, Finding the fractal dimension of fractal road roughness based on the new scale-free area determination method, Journal of Guangxi University of Nationalities (Natural Science Edition), 25, pp. 75-79, (2019)
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