Elastic inclusions in ballasted tracks – a review and recommendations

Mayuranga, H. G. S.; Navaratnarajah, S. K.; Bandara, C. S.; Jayasinghe, J. A. S. C.

doi:10.1080/23248378.2023.2170285

Cited by 4 publications

(7 citation statements)

References 111 publications

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Section: Vibration Reductionmentioning

confidence: 99%

“…84 Rubber aggregates without using a binder (crumb rubber) without losing chemical properties provide a comparative economic advantage. 41,55 This is another aspect that leads companies to find a more economical way for their products while preserving the required mechanical characteristics.…”

Section: Price Of Under Ballast Matsmentioning

confidence: 99%

“…72 As a result, the stiffness of the UBM appears to be a challenging property due to its impact on the improvement of track structure and performance. 55 Selection of the best UBM Nowadays, UBMs are used in a conventional track system, a metro line, light rail transit, and high-speed railways. There are some requirements for using a UBM in different track systems including rigidity (static and dynamic modulus), fatigue (mechanical fatigue strength), and harsh environment (low and high temperature resistance, chemical resistance, fire resistance, etc.).…”

Section: Stiffness Of the Ubmsmentioning

confidence: 99%

“…There are some requirements for using a UBM in different track systems including rigidity (static and dynamic modulus), fatigue (mechanical fatigue strength), and harsh environment (low and high temperature resistance, chemical resistance, fire resistance, etc.). 24,[89][90][91][92][93] However, they have other traits which directly affect the mat selection, such as loading condition, subgrade stiffness, and so on, 55 selecting the best mat still seems to be challenging due to various kinds of mats with different materials and bonding as well as a vast property requirement that needs to be noticed in every type of railway structure for instance mat stiffness and thickness. Technical requirements of UBMs and standards.…”

Section: Stiffness Of the Ubmsmentioning

confidence: 99%

“…These vibrations will be absorbed by the damping coefficient of materials or components through the track layers. 54,55 The UBM is also represented as a locally reacting spring and dashpot 56 which absorbs vibration due to its higher damping capacity 57 and decreases the internal contact stresses within the ballast by producing a relatively soft interface with the ballast. 58 UBM allows the ballast aggregates to bed into the relatively softer pad and thereby increasing the contact surface area of the ballast and reducing ballast stresses and continuously absorbing energy.…”

Section: Recent Developmentsmentioning

confidence: 99%

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Under ballast mat – A review of recent developments, limitations, and future prospects

Wang

Jing

Wang³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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A high frequency of loadings and an excessive amount of axle loads are rising as trains are becoming faster and heavier. In this regard, improvements in track design, such as using an under ballast mat, are vital to performance improvement. In addition to reducing noise, vibration, and ballast degradation, UBMs are designed to improve the dynamic behavior of tracks, thus extending their service life and increasing safety. This paper provides an overview of the recent developments on UBMs, identifies the crucial characteristics of different kinds of mats, including fatigue strength, environmental conditions, stiffness, and ballast deformation, and describes challenges for more widespread adoption. Limitations of using a UBM include their high cost and stiffness, limited knowledge of long-term efficiency, and interlocking reliability. This paper also provides future perspectives and prospects for overcoming the challenges in the utilization and acceptance of UBMs.

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Section: Vibration Reductionmentioning

confidence: 99%

Section: Price Of Under Ballast Matsmentioning

confidence: 99%

Section: Stiffness Of the Ubmsmentioning

confidence: 99%

Section: Stiffness Of the Ubmsmentioning

confidence: 99%

Section: Recent Developmentsmentioning

confidence: 99%

See 3 more Smart Citations

Under ballast mat – A review of recent developments, limitations, and future prospects

Wang

Jing

Wang³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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Effect of Grid Under Sleeper Pad on Shear Resistance at Sleeper–Ballast Interface

Mayuranga,

Navaratnarajah,

Bandara

et al. 2024

Lecture Notes in Civil Engineering

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From Material to Field Test: An Improved Under Sleeper Pad Model

Ulu,

Metin,

Arikoglu

et al. 2024

Arab J Sci Eng

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This study aims to determine the stiffness values of under sleeper pad (USP) and rail pad (RP) components to reduce the high-amplitude vibrations that occur in the transition zones of some specific structures such as viaducts in ballasted railways. The conventional method of simulating USPs and RPs as spring–dashpot elements in the Kelvin–Voigt model is inadequate due to the absence of frequency and temperature dependencies in the model. The study proposes a new analytical model that considers USPs and RPs as viscoelastic (VE) materials and integrates them into the ballasted railway superstructure model by adding unit masses avoiding mathematical singularity. The process includes material testing, field measurements, and validation of the proposed model with finite element model analysis. The effect of ambient temperature and material modelling on the superstructure’s dynamic response in the frequency domain is analysed in detail. To account for VE behaviours of the resilient elements, the generalised Maxwell model (GMM) is chosen via unit mass implementation compared to other VE models. The obtained results show that the dynamic response of the railway superstructure is 8–10 times sensitive to temperature variation. This demonstrates how important it is to include the temperature-dependent dynamics of the elastomer material in the model. According to the other results that were obtained, the use of USP in transition zones does not solve the vibration problem radically. Bridge dynamic responses are also sensitive to the mass of the bridge rather than its stiffness.

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Elastic inclusions in ballasted tracks – a review and recommendations

Cited by 4 publications

References 111 publications

Under ballast mat – A review of recent developments, limitations, and future prospects

Under ballast mat – A review of recent developments, limitations, and future prospects

Effect of Grid Under Sleeper Pad on Shear Resistance at Sleeper–Ballast Interface

From Material to Field Test: An Improved Under Sleeper Pad Model

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