Abstract
Aerodynamic pressure significantly impacts the scientific evaluation of tunnel service performance. The aerodynamic pressure of two trains running in a double-track tunnel is considerably more complicated than that of a single train. We used the numerical method to investigate the difference in aerodynamic pressure between a single train and two trains running in a double-track tunnel. First, the numerical method was verified by comparing the results of numerical simulation and on-site monitoring. Then, the characteristics of aerodynamic pressure were studied. Finally, the influence of various train–tunnel factors on the characteristics of aerodynamic pressure was investigated. The results show that the aerodynamic pressure variation can be divided into stage I: irregular pressure fluctuations before the train tail leaves the tunnel exit, and stage II: periodic pressure declines after the train tail leaves the tunnel exit. In addition, the aerodynamic pressure simultaneously jumps positively or drops negatively for a single train or two trains running in double-track tunnel scenarios. The pressure amplitude in the two-train case is higher than that for a single train. The maximum positive peak pressure difference (PSTP) and maximum negative peak pressure difference (PSTN) increase as train speed rises to the power from 2.256 to 2.930 in stage I. The PSTP and PSTN first increase and then decrease with the increase of tunnel length in stage I. The PSTP and PSTN increase as the blockage ratio rises to the power from 2.032 to 2.798 in stages I and II.
摘要
目 的
气动压力是高速铁路隧道结构服役性能的重要影响因素之一. 文章旨在对比高速铁路隧道内单车经过与双车交会诱发的气动压力差异特征, 探究列车速度、 隧道长度以及阻塞比对气动压力差异特征的影响规律, 进而为高铁隧道结构后续的科学服役提供理论支撑.
创新点
1. 对比分析高速铁路隧道内单车经过与双车交会诱发的气动压力差异特征; 2. 探究列车速度、 隧道长度以及阻塞比对气动压力差异特征的影响规律.
方 法
1. 通过三维数值仿真, 再现高速列车经过隧道的全过程; 与现场实测数据进行对比, 验证三维数值仿真所用模型参数的准确性与合理性. 2. 通过数理统计, 对比高铁隧道内单车经过与双车交会诱发的气动压力差异特征, 探究列车速度、 隧道长度以及阻塞比对气动压力差异特征的影响规律.
结 论
1. 高速铁路隧道内单车经过与双车等速交会时, 气动压力时程曲线同步升降低, 且双车交会诱发的压力峰值显著大于单车经过; 2. 列车在隧道内行驶时, 气动压力与速度幂次方成正相关性; 3. 气动压力峰值与隧道长度幂次方之间无显著的线性关系; 4. 列车在隧道内行驶或驶出隧道后, 气动压力峰值与阻塞比幂次方均成正相关.
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Acknowledgments
This work is supported by the Key Project of High-Speed Rail Joint Fund of National Natural Science Foundation of China (No. U1934210).
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Jianming DU conducted the numerical calculation and wrote the first draft of the manuscript. Qian FANG revised the final version. Xuan ZHANG and Hualao WANG processed the data.
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Jianming DU, Qian FANG, Xuan ZHANG, and Hualao WANG declare that they have no conflict of interest.
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Du, J., Fang, Q., Zhang, X. et al. Comparative analysis between single-train passing and double-train intersection in a tunnel. J. Zhejiang Univ. Sci. A (2024). https://doi.org/10.1631/jzus.A2300339
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DOI: https://doi.org/10.1631/jzus.A2300339