非均匀冻胀条件下铁路纵向变形模型及参数分析
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作者单位:

1.兰州理工大学 甘肃省土木工程防灾减灾重点实验室;2.甘肃省科学院地质自然灾害防治研究所;3.中国地震局(甘肃省)黄土地震工程重点实验室;4.甘肃林业职业技术学院

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基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)(42067066)


Longitudinal deformation model and parameter analysis of railway under non-uniform frost heave
Author:
Affiliation:

1.Lanzhou University of Technology;2.Geological Hazards Prevention Institute, Gansu Academy of Sciences,;3.Key Laboratory of Loess Earthquake Engineering of China Earthquake Administration & Gansu Province;4.5. Gansu Forestry Technological College

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    摘要:

    我国是冻土分布大国,寒区铁路轨道普遍遭受地基土冻胀影响。以往的研究偏重地基土的冻胀特征,而对纵向非均匀冻胀变形下铁路与地基土的相互作用关注较少。本文基于双层弹性地基梁理论,建立了铁轨-轨下基础在非均匀冻胀变形作用下的力学模型,给出了模型的解析解,结合算例分析了夹层弹性系数和冻胀量对轨道位移和内力的影响。结果表明:弹性夹层可以有效减弱铁轨的冻胀变形和应力响应,有利于维护铁轨的运营;铁轨和轨下基础的过渡段长度、凹凸弯折段处的剪力、弯矩随着冻胀位移的增大而增长;夹层弹性系数增大会导致冻胀力对轨下基础的影响逐渐向轨道转移;过渡段的长度只与冻胀量有关。本文提出的计算方法和分析结论可为寒区铁路设计和运营维护提供科学指导。

    Abstract:

    China is a country with a large distribution of frozen soil. Railway tracks in cold regions are generally affected by frost heaving of foundation soil. Previous studies focused on the frost heave characteristics of foundation soil, but paid less attention to the interaction between railway and foundation soil under longitudinal non-uniform frost heave deformation. Based on the beam theory of double-layer elastic foundation, this paper establishes the mechanical model of rail under rail foundation under the action of non-uniform frost heaving deformation, gives the analytical solution of the model, and analyzes the effects of interlayer elastic coefficient and frost heaving on track displacement and internal force combined with an example. The results show that the elastic interlayer can effectively reduce the frost heave deformation and stress response of the rail, which is conducive to the operation of the rail; The length of the transition section between the rail and the foundation under the rail, the shear force and bending moment at the concave convex bending section increase with the increase of frost heave displacement; The increase of the elastic coefficient of the interlayer will cause the influence of frost heaving force on the foundation under the track to gradually transfer to the track; The length of the transition section is only related to the amount of frost heaving. The calculation method and analysis conclusion proposed in this paper can provide scientific guidance for railway design, operation and maintenance in cold regions.

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  • 收稿日期:2022-03-20
  • 最后修改日期:2022-05-22
  • 录用日期:2022-06-02
  • 在线发布日期: 2022-11-12
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