The effect of soil improvement and auxiliary rails at railway track transition zones

Chumyen, P.; Connolly, David; Woodward, Peter Keith; Markine, Valéri

doi:10.1016/j.soildyn.2022.107200

Cited by 21 publications

(3 citation statements)

References 57 publications

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“…complex railhead geometries, transition zones, etc. [9,10,11]). However, these methods require significant computational capacity due to the need for large domains.…”

Section: Introductionmentioning

confidence: 99%

Railway Track Structural Dynamics via Periodic Approaches

Lamprea-Pineda,

Castanheira-Pinto,

Alves Costa

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Periodicity can be defined as the repetitive character of a structure's features. In railway track systems, periodicity can be found in the geometrical and material properties in the train passage direction. For example, the repeating pattern of sleepers, rail seats or slab track units. To take advantage of this, this paper employs the direct periodic method, a novel numerical method which exploits the invariant nature of the railway track structure. Instead of simulating the total track domain, the direct periodic method studies a discrete portion of the track, often known as the reference cell, which captures its repetitive pattern and provides the total track response. First, the cell response is obtained by enforcing compatibility conditions within its system of equations of motion in the wavenumber-frequency domain. Then, the total space response is retrieved by replicating the cell's solution via a combination of periodic conditions and Fourier transformations. It is combined with perfectly matched layers to simulate infinite depth soil boundary conditions. Thus, this paper employs the direct periodic method in combination with perfectly matching layers to analyze track-ground dynamic interaction.

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“…complex railhead geometries, transition zones, etc. [9,10,11]). However, these methods require significant computational capacity due to the need for large domains.…”

Section: Introductionmentioning

confidence: 99%

Railway Track Structural Dynamics via Periodic Approaches

Lamprea-Pineda,

Castanheira-Pinto,

Alves Costa

et al. 2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

View full text Add to dashboard Cite

show abstract

“…The bottom level of spring is always in contact with the top rail surface using the penalty-based approach, considering the surface as the master and bottom node as the slave segments. The additional details of track and vehicle modelling can be found in [7].…”

Section: Methodsmentioning

confidence: 99%

Numerical study of auxiliary rails application at railway transition zones

Chumyen¹,

Connolly²,

Woodward³

et al.

Civil-Comp Conferences

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Railway track transition zones are problematic areas with rapid track deterioration and frequent track maintenance due to a sudden change in the track-soil structure, corresponding to differential track stiffness. Changes can be related to the connection between ballasted and slab track, bridge approaches, and tunnel entry/exits. To deal with this dynamic effect, the usage of auxiliary rails between the running rails is one of the well-known and effective techniques for railway transition zones. However, there is some shortage of knowledge about the influence of the spacing between auxiliary rails. Therefore, this paper develop a 3D finite element transition zones model of ballast-slab track with auxiliary rails, using eight-node solid elements and a perfectly matched layer (PML) for absorbing boundary conditions. The material properties for all track-soil components are defined as the isotropic and linear elastic. A moving train load is modelled using a sprung mass model to represent train-track interaction. After the simulation, the numerical results is validated against field data at a transition zone. Once validated, the model analysis of transition zones with auxiliary rails indicates that using two auxiliary rails is sufficient to improve the dynamic track characteristics across the transition. Further, the effect of three different spacing between two auxiliary rails is investigated and compared. It is found that the widely spaced auxiliary rails provide a more significant advantage on dynamic performance than closely-spaced ones, considering on receptance responses, rail displacements and stress distributions from ballast to natural soil layer.

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“…Similarly, the various track properties play a crucial role in the overall railway response. Important variations in the track properties, such as rail irregularities, transitions zones, etc., result in wheel-track interaction forces, which amplify the structure response [8][9]. Regarding the supporting soil, magnification in its response depends upon its properties and the dynamic excitation [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Modelling the Critical Speed Amplification Effect on Railway Track-Ground Systems

Lamprea-Pineda¹,

Connolly²,

Hussein³

et al.

Civil-Comp Conferences

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The railway track vibration generated by the train passage depends upon the individual and combined effect of its various components: the train, the track and the supporting soil. In the case of the train, higher speeds result in larger vibrations on the railway structure. Moreover, amplification occurs when approaching the so-called 'critical speed', and the response is further increased when considering the multiple axles effect. Regarding the track, the type and properties also influence the overall structure response, increasing the wheel-rail interaction forces and magnifying the vibrations. Similarly, the supporting ground features directly affect track behaviour, propagating the total railway system response and causing disturbances in nearby structures and increasing the localisation of energy at transition zones. Although different numerical approaches meant to study these amplifications effects have been developed, deepwave propagating problems induced by high-speed trains require more elaborated simulations. Thus, this paper investigates the railway track amplifications due to speed, focusing on the different track types and soil layering effects, for which semianalytical approaches simulating the track-ground dynamic complex behaviour are employed.

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The effect of soil improvement and auxiliary rails at railway track transition zones

Cited by 21 publications

References 57 publications

Railway Track Structural Dynamics via Periodic Approaches

Railway Track Structural Dynamics via Periodic Approaches

Numerical study of auxiliary rails application at railway transition zones

Modelling the Critical Speed Amplification Effect on Railway Track-Ground Systems

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