Differential Settlement Prediction of Ballasted Tracks in Bridge–Embankment Transition Zones

Shan, Yao; Zhou, Shunhua; Wang, Binglong; Ho, Carlton L.

doi:10.1061/(asce)gt.1943-5606.0002307

Cited by 46 publications

(5 citation statements)

References 46 publications

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“…Alternatively, 3D FE models are capable of a closer geometrical representation of an actual track structuresee for instance [106,[113][114][115][116]. This allows for modelling of 3D solids, including complex railhead geometries if desired [117][118][119][120][121].…”

Section: Multi-purpose Solution Approaches 2311 Finite Element Methodsmentioning

confidence: 99%

Beams on elastic foundations – A review of railway applications and solutions

Lamprea-Pineda

Connolly

Hussein

2022

Transportation Geotechnics

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Section: Multi-purpose Solution Approaches 2311 Finite Element Methodsmentioning

confidence: 99%

Beams on elastic foundations – A review of railway applications and solutions

Lamprea-Pineda

Connolly

Hussein

2022

Transportation Geotechnics

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“…A good review of modeling techniques in track transitions is provided in [ 1 , 2 , 3 ] and there are recently reported techniques that consider, for example, ballast settlement [ 39 , 40 ]. It is necessary to use nonlinear contact elements to model the interface between sleepers and ballast so the hanging sleepers phenomenon can be better studied.…”

Section: Numerical Modelmentioning

confidence: 99%

Monitoring Track Transition Zones in Railways

Sañudo

Jardí²,

Martinez³

et al. 2021

Sensors

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This manuscript presents the first measurement program and data collection on the Dinatrans track transition solution after it was installed in a track section in the north of Spain (Galicia). The Dinatrans solution was created to address the limitations of several track transition solutions. This novel solution consists of two inner and outer rails from slab track to ballast track, pads with different stiffness over sleepers of variable lengths installed from ballast track to slab track, and a simple substructure formed by non-structural concrete poured over the natural ground. The main objective of this research was to assess the suitability and the initial performance of the Dinatrans track transition solution. The measured variables for these initial real-world tests were vertical accelerations on sleepers, shear stress on rails, vertical displacements on rails and vertical displacements on sleepers. All measurements of these variables were obtained in an in-situ program by installing vertical accelerometers and LVDTs on the track structure and extensometer gauges on the rails and sleepers. The methodology and the procedures followed are described. The Dinatrans initial solution was compared with the Standard solution used in Spain using these initial measurements. This field analysis provides an initial understanding of the performance of the new track transition. Further measurements will be required to check the track transition performance over the long term; however, no maintenance works have been necessary since construction (2016).

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“…These high axle loads can induce elevated strains in the track substructure, causing non-linear soil stiffness and damping [2][3][4]. 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].…”

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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Differential Settlement Prediction of Ballasted Tracks in Bridge–Embankment Transition Zones

Cited by 46 publications

References 46 publications

Beams on elastic foundations – A review of railway applications and solutions

Beams on elastic foundations – A review of railway applications and solutions

Monitoring Track Transition Zones in Railways

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

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