Laboratory evaluation of railroad ballast behavior under heavy axle load and high traffic conditions

Kashani, Hamed Faghihi; Hyslip, James P.; Ho, Carlton L.

doi:10.1016/j.trgeo.2017.04.002

Cited by 27 publications

(10 citation statements)

References 11 publications

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“…where ξ i , η i , and ζ i are the coordinate values of the node 8) in the local coordinate system, which can be taken as 1 or − 1.…”

Section: The Principle Of Discrete-continuous Medium Coupling Algorithmmentioning

confidence: 99%

“…In addition to the track model, the loading system is also important for the test. Among them, Faghihi Kashani et al [8], Momoya et al [9], and Yu et al [10] use the actuator controlled by hydraulic servocontrol system to load. e hydraulic servosystem is a nonlinear system; in order to achieve the accuracy and stability of dynamic wheel load simulation, it is necessary to adopt efficient control methods.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

Xue-jun

et al. 2020

Mathematical Problems in Engineering

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In this paper, a discrete and continuous body coupling algorithm is used to study the dynamic contact characteristics between ballasts and between ballasts and track structures. Firstly, the three-dimensional fine modeling of ballast particles is realized based on the three-dimensional laser scanning method, and then through the discrete and continuum coupling algorithm from the micro-macro point of view, a multiscale and unified particle-track structure coupling model is established. Based on the coupling model, the macro-and microdynamic characteristics of the ballast bed and the mechanical characteristics of the track structure under the dynamic load of high-speed trains with different driving speeds are studied. It is shown that the cumulative settlement of the ballast bed is directly proportional to the contact force and rotation speed of the ballast, and the faster the driving speed is, the greater the cumulative deposition speed and cumulative settlement of the ballast are. e contact force between the ballast and sleeper mainly comes from the bottom of the sleeper, and its contact force and contact strength increase with the increase of driving speed.

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“…where ξ i , η i , and ζ i are the coordinate values of the node 8) in the local coordinate system, which can be taken as 1 or − 1.…”

Section: The Principle Of Discrete-continuous Medium Coupling Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

Xue-jun

et al. 2020

Mathematical Problems in Engineering

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“…In summer, metropolitan intersections are particularly vulnerable to plastic deformation because of the behavior of asphalt mixtures at high temperatures. This is mostly the effect of heavy vehicle traffic and long waiting periods [5][6][7][8]. Unlike normal cases where road surfaces-such as auxiliary layers, substrates, intermediate layers, and surface layers-connect, traffic cannot be completely switched in these intersections.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Plastic Deformation in Heavy Traffic Intersections in Urban Areas

Song

Yeom

2021

Sustainability

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This study aims to maximize the effects of reducing plastic deformation in heavy traffic intersections in urban areas by improving the aggregates and binders of asphalt mixtures in order to verify the strength effect of SMA (Stone Mastic Asphalt) mixtures compared with that of fluid-resistant asphalt mixtures. The authors examine the pavement performance and conduct an economic analysis for sustainable urban infrastructure. Additionally, to reduce plastic deformation, the study analyzed an improvement plan through experimental research based on the existing literature. First, we determined the mixing design specifications of the general asphalt fluid-resistant mixture and SMA mixture, which is known to reduce plastic deformation. Next, we confirmed the appropriateness of the raw materials and mixing design results. Finally, a performance test was conducted on plastic deformation resistance. A wheel tracking test was also conducted as a performance experiment. The test body—with a fiber grid reinforcing material installed in the SMA mixture—showed high dynamic stability, which was the most effective for reducing plastic deformation.

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“…Accumulated traffic load leads to differential settlement of ballast bed and, consequently, to track geometry deterioration. [1][2][3][4] For that reason, track geometry is subjected to regular inspections using track recording car. Data collected during these inspections provide the basis for maintenance planning, which is needed to realign the track geometry and thus enable safe traffic passage.…”

Section: Introductionmentioning

confidence: 99%

Application of seismic tomography for assessment of the railway substructure condition

Lazarević

Vučković

Vilotijević

et al. 2018

Structural Health Monitoring

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This article presents results obtained in the research conducted on railway infrastructure in Serbia, which aimed at prediction of substructure condition based on the analysis of track quality. It presents the results of seismic tomography application as non-destructive procedure for assessment of railway substructure condition. Track geometry quality was assessed according to analysis of longitudinal level data, which was recorded during regular track geometry inspections. Track section for application of seismic tomography was chosen on the basis of analysed track geometry data recorded during the regular track geometry inspections in 2006, 2008, 2009, 2012, 2013 and 2014. Tomographic imaging of railway platform on Test Section enabled the creation of two-dimensional finite element model, which was used for determination of propagation speed of seismic P-waves. Seismic tomography on Test Section, which is the part of the international railway line Belgrade–Vrbnica, was performed in 2014. Obtained tomographic image was discussed and compared to track geometry data recorded during the regular track geometry inspections.

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Laboratory evaluation of railroad ballast behavior under heavy axle load and high traffic conditions

Cited by 27 publications

References 11 publications

Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

Modeling of Coupling Mechanism between Ballast Bed and Track Structure of High-Speed Railway

Reduction of Plastic Deformation in Heavy Traffic Intersections in Urban Areas

Application of seismic tomography for assessment of the railway substructure condition

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