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
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