Ground vibration characteristics of high-speed railway induced by uneven settlement of subgrade with train speed increasing

被引：0
|
作者：
Jiang H. [1 ]
Li Y. [1 ]
Chi H. [1 ]
Liu S. [1 ]
Liang M. [1 ]
Yao Z. [1 ]
机构：
[1] School of Qilu Transportation, Shandong University, Jinan
来源：
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2021年 / 51卷 / 03期
关键词：
Ground vibration; High-speed railway; Subgrade uneven settlement; Train speed increasing; Vertical Z-vibration level;
D O I：
10.3969/j.issn.1001-0505.2021.03.012
中图分类号：
学科分类号：
摘要：
To reveal the foundation vibration characteristics induced by uneven settlement of subgrade with train speed increasing, a three-dimensional finite element dynamic analysis model of train-track-subgrade considering uneven settlement was established. The influence of typical uneven settlement of subgrade on the vibration propagation of foundation with train speed increasing was obtained by using the time-domain and frequency-domain analysis methods. The feasibility of train speed increasing was also discussed based on the domestic and foreign environmental vibration control standards. The results show that the uneven settlement of subgrade can lead to significant increase of foundation vibration. The horizontal and vertical vibration accelerations increase to 2.8 and 2.0 times, respectively. The spectrum response of foundation vibration is dominated by low frequency, and its characteristic frequency is mainly determined by the length of single carriage, which cannot reflect the wavelength characteristics of the uneven settlement on the subgrade surface. The increase of the train speed leads to the aggravation of foundation vibration, but its influence is lower than that of the subgrade uneven settlement. Under the limit of the settlement wavelength of 20 m and the amplitude of 15 mm in the current specifications, the vertical Z-vibration level at the vehicle speed of 360 km/h exceeds the environmental vibration requirements. Therefore, the effect of the smooth state of subgrade needs to be further evaluated before the speed is increased. © 2021, Editorial Department of Journal of Southeast University. All right reserved.
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页码：442 / 448
页数：6
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