Dynamic Responses Law of Subgrade of a Special Railway Line in Loess Region

被引：0
|
作者：
Wang R. [1 ]
Hu Z. [1 ,2 ]
Yin K. [1 ]
Ma J. [1 ]
Ren X. [1 ]
机构：
[1] School of Civil Engineering, Chang'An University, Xi'an
[2] Institute of Underground Structure and Engineering, Chang'An University, Xi'an
来源：
Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University | 2022年 / 56卷 / 07期
关键词：
2. 5D finite element method; environmental vibration; field test; influence depth; irregularity; traffic loading;
D O I：
10.16183/j.cnki.jsjtu.2021.130
中图分类号：
学科分类号：
摘要：
In order to investigate the dynamic response law of subgrade of a special railway line in loess region under moving train loading, the field test data and 2. 5D finite element results were adopted to assess the dynamic stress distribution and its influence depth, and the environmental vibration law in the office area along the line was also analyzed. The results show that the excessive abstraction of the track system might enlarge the amplitude and influence the range of dynamic stress. The entity modeling of the 'ballast-sleeper-fastener' system makes the distribution of the dynamic stress in the subgrade more reasonable. The influence of energy consumption caused by the dynamic creep of soil have a negligible influence when the subgrade is in a quasi-static state. The speed has a negligible effect on the distribution of the dynamic stress of the subgrade when a freight train is running at a low speed, and the influence depth of the dynamic stress is about 4. 2 m. As the speed decreases, the influence of track irregularity on the environmental vibration increases. The environmental vibration can be effectively controlled by improving the short wave length irregularity. © 2022 Shanghai Jiao Tong University. All rights reserved.
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页码：908 / 918
页数：10
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