Analytical Model for Rail Deflection of Ballasted Railway Caused by Tunnelling Underneath

被引：0
|
作者：
Zhang B. [1 ,2 ]
Liu H. [1 ]
Luo C. [1 ]
机构：
[1] School of Civil Engineering, Fujian University of Technology, Fuzhou
[2] Key Laboratory of Underground Engineering for Colleges, Universities of Fujian Province, Fuzhou
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2023年 / 45卷 / 10期
关键词：
ballasted track; rail deflection; tensionless foundation; tunneling underneath; two-stage analytical method;
D O I：
10.3969/j.issn.1001-8360.2023.10.012
中图分类号：
学科分类号：
摘要：
Tunnelling underneath a ballasted railway may inevitably cause the irregularity of the overlying existing railway track, further affecting the riding comfort. In this study, an analytical method was proposed to estimate the rail deflection induced by tunnelling underneath. Firstly, a Gaussian distribution formula was employed to predict the tunnel construction-induced subgrade settlement. Secondly, the rail deflection was formulated by supposing the rail as an infinite beam on a tensionless foundation. The rail deflection caused by tunnelling underneath from the proposed approach was compared and validated with model testing data and monitoring data. The effects of rail bending stiffness, intersection angle between the newly built tunnel and railway, and the subgrade settlement trough width on the rail deflection were further discussed. As the coefficient of subgrade settlement trough width is less than 2, voids between the ballast and the sleeper may be observed during the construction of a newly built tunnel. The amplitude of rail deflection will decrease with the increasing of rail bending stiffness. The wavelength of track deflection will decrease with the increasing of intersection angle between the newly built tunnel and railway. With the increasing of subgrade settlement trough width, the wavelength of rail deflection may increase and the amplitude of rail deflection may decrease. © 2023 Science Press. All rights reserved.
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页码：105 / 111
页数：6
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