Study on Dynamic Response Law of Double-track Heavy-haul Railway Subgrade

被引：0
|
作者：
Dong J. [1 ]
Leng W. [1 ,2 ]
Xu F. [1 ,2 ]
Zhang Q. [1 ]
Yang Q. [1 ]
Liu S. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2024年 / 46卷 / 01期
关键词：
double-track heavy-haul railway; dynamic response; finite element analysis; subgrade;
D O I：
10.3969/j.issn.1001-8360.2024.01.016
中图分类号：
学科分类号：
摘要：
A three-dimension sleeper-subgrade-foundation finite element model was established to investigate the dynamic response law of the double-track heavy-haul railway subgrade. The results show that the dynamic stress at the subgrade surface below the train running track presents a saddle-shaped distribution along the transverse direction. The dynamic stress below the upline rail decreases with the increase of the depth when a train passing through the upline, whereas, the dynamic stress at the center of the subgrade under different operation modes increases first before decreasing with the increase of the depth. The vertical dynamic displacement at the subgrade surface presents significant concave distribution characteristics along the transverse direction. The peak dynamic displacement caused by the one-way operation of a fully-loaded train can be 5. 36 times of that induced by an empty train. The effect of train axle load on the subgrade velocity response is relatively small. The peak acceleration at the subgrade surface increases about 10% when the train axle load increases from 25 t to 30 t. The dynamic response of the subgrade subjected to the train operation on the double-track railway is greater than that under one-way train operation. The peak acceleration, velocity and dynamic displacement below the downline rail caused by a fully-loaded train running on the upline are greater than those caused by an empty train running on the downline. © 2024 Science Press. All rights reserved.
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页码：145 / 155
页数：10
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