Comparison of the effects and efficiency of vertical and side tamping methods for ballasted railway tracks

Przybyłowicz, Michał; Sysyn, Mykola; Gerber, Ulf; Kovalchuk, Vitalii; Fischer, Szabolcs

doi:10.1016/j.conbuildmat.2021.125708

Cited by 30 publications

(8 citation statements)

References 37 publications

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“…It indicates the major influence of the residual pressure on the wave propagation velocity. Similar behavior of wave propagation was presented in other experimental and theoretical studies (Sysyn et al 2019b(Sysyn et al , 2020Przybyłowicz et al 2022;Kurhan and Fischer 2022).…”

Section: Discussionsupporting

confidence: 85%

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

Sysyn

Gerber

Liu

et al. 2022

Transp. Infrastruct. Geotech.

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During track construction or ballast bed maintenance, ballast layer compaction quality plays an essential role in the following track irregularity accumulation, its lifecycle, and maintenance costs. The ballast compaction process is characterized by its compaction and the accumulation of the stressed state. The elastic wave propagation methods are an effective way for the identification of the ballast bed compaction properties. The paper presents the theoretical and experimental studies of the ballast consolidation under the vibration loading of the sleeper. The practical laboratory study is given by the 1:2.5 scaled physical model of one sleeper and the corresponding ballast layer box. The measurements of ballast pressure and deformations under the vibration loading in the ballast layer and the photogrammetric recording of the ballast flow are carried out. The measurements demonstrate the accumulation of the residual stresses under the ballast layer. Furthermore, the measurements of elastic wave time of flight (ToF) using the shakers under the sleeper and acceleration sensors under the ballast show the substantial increase of the ToF velocities after the tamping process. Moreover, the distribution of the velocities along the sleeper is spatially inhomogeneous. The numeric simulation using the discrete element method (DEM) of the tamping and the testing processes proves the inhomogeneous wave propagation effect. The modeling shows that the main reason for the wave propagation inhomogeneity is the accumulated residual stress distribution and the minor one – the compaction density. Additionally, a method for identifying wave velocity spatial distribution is developed by wave tracing the inhomogeneous medium. The procedures allow ballast identification in the zones outside the shakers.

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Section: Discussionsupporting

confidence: 85%

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

Sysyn

Gerber

Liu

et al. 2022

Transp. Infrastruct. Geotech.

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“…It should be noted that the practical application of new types of transition curves, which have a number of excellent properties compared to clothoide, is complicated due to the unresolved issues of normalization of their parameters and support of the horizontal track geometry [17,18]. Thus, the normalization of the lengths of transition curves depending on the radius that is included in the statebuilding norms of Ukraine SBN В.2.3-19:2018 [19], can only be applied to clothoide, and only in cases of a connection of direct with circular curves.…”

Section: Title Equationmentioning

confidence: 99%

Determination of the type and the length for the transition curves on the directions of high-speed train operation

Kurhan

Hmelevska

2022

Acta Tech. Jaurinensis

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In many countries around the world, a cubic parabola is used as transition curves in a simplified form. Today, the properties of many mathematical curves are well studied, which can be used as transition curves. The object of research is the process of restructuring transition curves when organizing high-speed trains operation. The use of modern means of mathematical modelling allows to add a number of dynamic characteristics for evaluation parameters of motion in the curved sections of the tracks. Thus, with an increase in speed for transition curves, both the values of unbalanced acceleration and its change in time, and also the velocity attenuation of oscillations of rolling stock when moving from a transition curve to a circular curve or to a direct section. On the basis of the conducted research, it has been found that when increasing the speed of the vehicle movement in the range from 120 to 200 km/h, the length of the stabilization section increases at the output of the curvature by an average of 20 m for every 40 km/h. The analysis showed that with correctly set parameters of transition curves, which correspond to the maximum speed of movement and radius of a circular curve, the strength and reliability of the bearing elements in the structure of the permanent way and the travel comfort are fully ensured.

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“…Mcdowell et al [12] analyzed the influence of the number of tamping operations on the ballast settlement under cyclic loads using a ballast box model. Przybyłowicz et al [13] studied the difference in the density and cumulative settlement of ballast beds under vertical and side directions using a down-scaled model. The results show that the settlement pace after vertical tamping is higher than that after side tamping.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

Xiao

Zhang

Zhu

et al. 2023

Construction and Building Materials

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Comparison of the effects and efficiency of vertical and side tamping methods for ballasted railway tracks

Cited by 30 publications

References 37 publications

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

Studying the Relation of the Residual Stresses in the Ballast Layer to the Elastic Wave Propagation

Determination of the type and the length for the transition curves on the directions of high-speed train operation

Experimental analysis of ballast bed state in newly constructed railways after tamping and stabilizing operation

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