路基-桥梁过渡区不均匀冻胀作用下的车轨耦合系统动力分析

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-12-26 DOI:10.1016/j.coldregions.2024.104414

Binqiang Li , Jun Luo , Yanbo Bai , Zhenxing He , Yapeng Wang , Penghao Li , Wanming Zhai

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引用次数: 0

摘要

季节性冻土区路基-桥梁过渡区经常遇到不均匀冻胀，会导致轨道变形，甚至危及车辆的运行安全。为此，本文对考虑冻胀变形影响的车轨耦合系统进行了动力分析。首先采用有限元法得到钢轨不平顺度与冻胀变形之间的关系。然后，建立了车辆-轨道垂直耦合动力学模型，并通过实测数据、已发表成果和现有模型验证了模型的准确性。分析了典型冻胀作用下车辆-轨道耦合系统的时域动力响应。然后，对冻胀变形进行了参数化分析。最后，从车辆行驶安全性、舒适性、轨道变形等方面提出了冻胀控制阈值。数值计算结果表明，对于波长小于10 m、10 ~ 15 m和大于15 m的冻胀，应分别控制在5 mm、20 mm和25 mm。研究结果为季节性冻土区冻土带轨道的维护和运行提供了理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Dynamic analysis of a vehicle-track coupled system subjected to uneven frost heave in the subgrade-bridge transition zone

Uneven frost heave is frequently encountered in the subgrade-bridge transition zones (SBTZ) in seasonally frozen soil regions, which could lead to the deformation of track and even jeopardize running safety of vehicles. To this end, this paper conducts dynamic analysis of a vehicle-track coupled system accounting for the effect of frost heave deformation. Initially, the finite element method is used to obtain the relationship between rail irregularity and frost heave deformation. Then, a vehicle-track vertically coupled dynamics model is established, and its accuracy is validated by the measured data, published results and existing model. The time-domain dynamic responses of a vehicle-track coupled system under typical frost heave are analyzed. Afterwards, parametric analysis of frost heave deformation is conducted. Finally, the control threshold of frost heave is proposed from aspects of vehicle running safety, comfort, and track deformation. Numerical results indicate that the allowable amplitude of frost heave should be respectively restricted to 5, 20, and 25 mm for frost heave wavelengths less than 10 m, between 10 and 15 m, and greater than 15 m. The research findings offer theoretical support for the maintenance and operation of track in the SBTZ in seasonally frozen soil regions.

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.