A study on the deformation characteristics of ballasted track at structural transition zone by multi-actuator moving loading test apparatus

Momoya, Yoshitsugu; Takahashi, Toru; Nakamura, Takahisa

doi:10.1016/j.trgeo.2015.11.001

Cited by 27 publications

(7 citation statements)

References 13 publications

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“…The difference in structural behavior between the two track systems makes the design of a transition zones challenging. This has triggered many numerical [17,18] and experimental [19] studies. An extensive overview of transition zone designs and numerical track models is given in [20].…”

Section: Model Of the Transition Zone And Trainmentioning

confidence: 99%

Periodic track model for the prediction of railway induced vibration due to parametric excitation

Germonpré

Degrande

Lombaert

2018

Transportation Geotechnics

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Railway induced ground-borne vibration in urban areas has become a major environmental problem with large societal impact. Accurate computational models for the prediction of railway induced vibration generally require extensive modeling effort and computation time. To increase the computational efficiency, a large number of track models assume a simplified track structure in the longitudinal direction, therefore being unable to account for parametric excitation due to transition zones, hanging sleepers or spatially varying track or subgrade characteristics. This paper presents a track modeling approach based on a wave analysis technique for multi-coupled periodic structures that allows to efficiently model a track with varying characteristics in the longitudinal direction and, therefore, to predict railway induced vibration due to parametric excitation. The track is modeled by a finite number of track sections with different properties, while each section consists of periodic cells with the same properties. A case study is presented investigating a track with a transition zone between ballasted and slab track. The train-track interaction forces are computed, as well as the vibration of the sleepers, the slab and in the free field. The influence of the train direction and train speed is evaluated.

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Section: Model Of the Transition Zone And Trainmentioning

confidence: 99%

Periodic track model for the prediction of railway induced vibration due to parametric excitation

Germonpré

Degrande

Lombaert

2018

Transportation Geotechnics

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“…Empirical studies involving railway embankments are generally performed on reduced scale models, e.g. [1,2]. Fullscale studies on high rockfill embankments are mainly for dams, e.g.…”

Section: Introductionmentioning

confidence: 99%

Discrete element modelling of rockfill railway embankments

2021

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There is a need of reducing the uncertainty in traffic loading-induced settlements within railway embankments. A previously developed model for unbound stone-based materials has been implemented for modelling rockfill embankments. Particles were represented by simple breakable tetrahedral clumps of spheres with four asperities each. Both corner breakage and particle splitting were allowed. Embankments with heights between 2 and 10 m were generated by successive dumping and compaction of layers of clumps on top of each other, mimicking the construction of real embankments. Cyclic loading of the embankments representing railway traffic, for both breakable and unbreakable assemblies, was carried out. Results show that the mechanical response is marked by a substantial degree of uncertainty exacerbated by particle degradation, especially for intermediate to high embankments. An analysis of particle rotation showed that particle rearrangement mostly accumulates in the top layers, resulting in a lack of influence of embankment height on settlements. Breakage, even being of (very) limited magnitude, had a statistically significant effect. Good agreement with common geostatic theories predicting horizontal pressures was also observed. Regarding resilient response, linear stiffening with embankment height is observed with a minor influence of breakage. All in all, it is shown that the specific scale, boundary and stress conditions of embankments results in a behaviour deviating from that observed under triaxial conditions. Therefore, the key contribution is showing that it is possible to realistically model high rockfill embankments under a large number of loading cycles and furthermore including degradation, something not attempted to date. Graphic abstract

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“…Extensive field measurements of the transition areas created by the crushed stone mixture backfill and their numerical modelling were carried out in Portugal [10][11][12]. A study of deformation characteristics in the transition area between the embankment and the concrete structure was also performed in Japan [13]. The main problems of transition areas, their alternative design and classification of the most common approaches to the solution of transition areas are presented in a study from Spain [14].…”

Section: Introductionmentioning

confidence: 99%

EVALUATION OF GEOTECHNICAL TESTS (STATIC LOAD TESTS) ON A SELECTED OPTIMISED SECTION OF RAILWAY CORRIDOR NO. Va

Ižvolt

Dobeš

2021

Transport Problems

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To improve the transport service of every country at the required level, it is necessary to set up appropriate infrastructure, including railways, and the necessary facilities of satisfactory quality. After the establishment of the Slovak Railways (ŽSR), the condition of the railway infrastructure was judged to be unsatisfactory. This situation urgently required optimisation of track sections, which are included in the trans-European corridors. The basic aim of optimisation of the railway network of ŽSR is to build a highquality, safe and reliable railway, which, due to its excellent quality, will correspond to the standards of advanced European countries and, at the same time, provide interoperability. Due to this, it was necessary to verify the fulfilment of the prescribed quality parameters on the optimised lines, among others, and also bear the capacity of individual structural parts of the sub-ballast layers. To address this aim, this paper deals with optimised corridor no. Va in the Považská Teplá -Žilina section, where the diagnostics of the quality of the sub-ballast layers was conducted. This paper specifically focuses on the evaluation of the determined values of the bearing capacity of the construction layers of the embankments and their foundations as well as the transition areas between the objects of sub-ballast layers and embankments located in the optimised section of the line.

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A study on the deformation characteristics of ballasted track at structural transition zone by multi-actuator moving loading test apparatus

Cited by 27 publications

References 13 publications

Periodic track model for the prediction of railway induced vibration due to parametric excitation

Periodic track model for the prediction of railway induced vibration due to parametric excitation

Discrete element modelling of rockfill railway embankments

EVALUATION OF GEOTECHNICAL TESTS (STATIC LOAD TESTS) ON A SELECTED OPTIMISED SECTION OF RAILWAY CORRIDOR NO. Va

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