Investigation of the Most Positions Affected in Rail Track When the Modulus of Elasticity of the Ballast Layer is Changed

IF 1.1 Q3 ENGINEERING, CIVIL
Zaman Alani, Adnan Q. Mohammed, Maysloon Zaidan
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Abstract

Abstract The railway is one of the cheapest methods to transport people and heavy goods. It is safer than highways. In Iraq, many railways connect the south country with the middle and north, which are old, damaged, and need to continued maintenance. Iraq needs to construct new lines of the rail track with low-cost, less maintenance, and highly stable structure, which requires understanding the behavior of rail track under train loads and the pattern of distribution of deformations, stresses, and strains inside the body of rail track and know the layer which more effected by changing the strength of ballast layer by change modulus of elasticity of it. This paper investigates the influence of modulus of elasticity of the ballast layer on the behavior of railways and the positions of deformation, stresses, and strains in the rail track which is most affected by the change in the modulus of elasticity and the value of the effect. The finite element approach was considered in this study using Abaqus Ver. 6.14-4 program. The investigation outcomes displayed that when the ballast layer’s modulus of elasticity E increase by 100 MPa, the value of deformation in the rail track is affected in all layers, and the value of decreased is 6.8 % for rail, 6.9 % for ballast, and 6.7 % for the sub-ballast layer. Therefore the strain of the sub-ballast layer is affected by the change modulus of elasticity of the ballast layer more than other ballast and subgrade. Also, the result shows that stresses in the rail are the only part of the rail track affected by the change in the ballast layer’s modulus of elasticity E, while the other layers are unaffected. So the increase in E of the ballast layer affects the layer beneath it, which is the sub-ballast layer.
改变道碴层弹性模量时铁轨受影响最大位置的研究
摘要 铁路是运输人员和重型货物最廉价的方法之一。它比高速公路更安全。在伊拉克,许多铁路连接着该国南部和中部及北部,这些铁路老旧、损坏严重,需要持续维护。伊拉克需要建造成本低、维护少、结构高度稳定的新铁路线,这就需要了解铁路在列车载荷作用下的行为以及铁路主体内部变形、应力和应变的分布模式,并了解通过改变无砟轨道层的弹性模量来改变其强度对哪一层影响更大。本文研究了无砟轨道层弹性模量对铁路行为的影响,以及受弹性模量变化影响最大的轨道变形、应力和应变位置及其影响值。本研究使用 Abaqus Ver. 6.14-4 程序考虑了有限元方法。研究结果表明,当无砟轨道层的弹性模量 E 增加 100 兆帕时,轨道各层的变形值都会受到影响,其中轨道的变形值减少了 6.8%,无砟轨道层的变形值减少了 6.9%,有砟轨道层的变形值减少了 6.7%。因此,有砟层弹性模量的变化对有砟层应变的影响大于其他有砟层和基层。此外,结果表明,轨道应力是轨道中唯一受无砟层弹性模量 E 变化影响的部分,而其他层则不受影响。因此,无砟层弹性模量 E 的增加会影响其下的层,即底砟层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
2.00
自引率
58.30%
发文量
69
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