The effect of rolling stock characteristics on differential railway track settlement: An engineering-economic model

Charoenwong, C.; Odolinski, Kristofer; Costa, Pedro Alves; Galvín, P.; Smith, Andrew

doi:10.1016/j.trgeo.2022.100845

Cited by 19 publications

(6 citation statements)

References 47 publications

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“…As China's railway network is being improved, new railways are connected with existing railways, resulting in adjacent subgrade sections. As the operation speed increases, the train becomes more sensitive to changes in the Track Quality Index (TQI) of the upper track, increasing the requirements of the subgrade structure [ 1 ]. Construction projects adjacent to existing railways must ensure the comfort and safety of the train operation and control the deformation of the subgrade structure.…”

Section: Introductionmentioning

confidence: 99%

Study on load transfer mechanisms and impact on adjacent railway subgrade within loess regions

Zhao,

Zhang,

et al. 2024

Heliyon

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Section: Introductionmentioning

confidence: 99%

Study on load transfer mechanisms and impact on adjacent railway subgrade within loess regions

Zhao,

Zhang,

et al. 2024

Heliyon

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“…This results in premature degradation and increased maintenance costs [5,6]. This is in-part due to the dynamic impact of heavier trains [7] with poor suspension on rail infrastructure [8,9]. In addition, a limited understanding of vehicleinduced dynamic responses often results in conservative infrastructure designs (with higher construction costs than necessary) [10].…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

Feng,

Luo,

Lyu

et al. 2023

Sustainability

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Retaining walls are structures used to retain earth materials on a slope. Typically, they are designed for static loads, but for highway and railway infrastructures, vehicle-induced dynamic responses are also relevant. Therefore, retaining wall structures are often designed with a factor of safety that is higher than necessary, because it can be challenging to quantify the magnitude of expected dynamic stresses during the design stage. This unnecessary increase in material usage reduces the sustainability of the infrastructures. To improve railway retaining wall sustainability, this paper presents the results from a field monitoring campaign on a heavy-haul rail line with a retaining wall, studying the dynamics induced in response to 30-ton axle load trains running at speeds of between 5 km/h and 100 km/h. The site comprises an earth embankment supported by a gravity retaining wall, with accelerometers on the sleepers, roadbed surface, and retaining wall, velocity sensors on the roadbed, and strain gauges on the rail web to record wheel–rail forces. The vibration intensities collected from various locations are processed to explore the peak particle velocities, maximum transient vibration values, and one-third octave band spectrums. Two transfer functions define the vibration transmission characteristics and attenuation of vibration amplitude along the propagation path. The long-term dynamic stability of the track formation is studied using dynamic shear strain derived from the effective velocity. The peaks of observed contact forces and vibrations are statistically analyzed to assess the impact of train speed on the dynamic behavior of the infrastructure system. Next, a 3D numerical model expresses the maximum stress and displacements on the roadbed surface as a function of train speed. The model evaluates the earth pressures at rest and vehicle-induced additional earth pressures and horizontal wall movement. The investigation provides new insights into the behavior of railway track retaining walls under train loading, and the field data are freely available for other researchers to download. The findings could facilitate the design of more sustainable retaining walls in the future.

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“…For instance, in ballasted tracks, the pattern is given by the repeated sleeper arrangement [16,17]; whereas in slab tracks, this is generated by the discrete rail-seats or repeating slab units [18,19,20,21]. Among the various periodic approaches, the 2.5D FEM has been extensively used for train-track-ground simulations in recent years [22,23,24,25,26,27]. Typically, this method is coupled with BE or PML (perfectly matching layers [28]) to account for the wave propagation response.…”

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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The effect of rolling stock characteristics on differential railway track settlement: An engineering-economic model

Cited by 19 publications

References 47 publications

Study on load transfer mechanisms and impact on adjacent railway subgrade within loess regions

Study on load transfer mechanisms and impact on adjacent railway subgrade within loess regions

An Analysis of Dynamics of Retaining Wall Supported Embankments: Towards More Sustainable Railway Designs

Railway Track Structural Dynamics via Periodic Approaches

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