Design theories and maintenance technologies of slab tracks for high-speed railways in China: a review

Ren, Juanjuan; Deng, Shijie; Zhang, Kaiyao; Du, Wei; Wu, Qinghong

doi:10.1093/tse/tdab024

Cited by 24 publications

(8 citation statements)

References 20 publications

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“…Maintenance on ballastless track is still an area of many unknowns. Even the fundament question as to whether the concrete slab should be maintained is still an open question, owing much to that potential structural problems of concrete slab may have not been sufficiently exposed (Ren et al, 2021). By analogy with the maintenance practice on highway concrete pavements, where crack is often seen as a major integrity threat, ballastless track with concrete slab may experience similar problems as it ages.…”

Section: Methodsmentioning

confidence: 99%

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A simulation-based life cycle cost model for track form selection-implementation

Li,

Zhang,

Dwight

2023

Proc. Of the 12th IMA International Conference on Modelling in Industrial Maintenance and Reliability

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This work presents the implementation details of a simulation-based model proposed in an earlier work by the authors where no implementation was covered. This model aims to support the railway industry in their decision-making on selecting the most cost-effective track form for a particular application by comparing life cycle costs of the available options. It is based on degradation conditions or life time distributions of track components and pre-set thresholds for initiating various maintenance actions on these track components. Major maintenance actions on major track components are considered for both ballasted track and ballastless track. Data obtained under various application contexts are sourced from the literature and the industry, complemented by manufactured data when no information is found. Data from miscellaneous sources are considered not an issue for the purpose of this study which is to demonstrate the feasibility of the proposed approach. By calculating the number of required maintenance actions first and the maintenance costs for ballasted and ballastless tracks afterwards, the work proves that the proposed model has achieved its intended function. Trials of the model on actual data from local rail industry are still underway. With these trails, performance of the model to support actual track form selection decisionmaking for a specific application will be further tested.

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Section: Methodsmentioning

confidence: 99%

“…It is often recognized to be cheaper to requiring almost no-cost to maintain compared with ballasted track but its high initial construction cost pushes many away. In addition, many of its long-term problems may have not been fully exposed (Ren et al, 2021). Traditional approaches e.g.…”

Section: Introductionmentioning

confidence: 99%

A simulation-based life cycle cost model for track form selection-implementation

Li,

Zhang,

Dwight

2023

Proc. Of the 12th IMA International Conference on Modelling in Industrial Maintenance and Reliability

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“…The settlement creates track irregularities, alters frequency characteristics of wheel-rail interactions into abnormal condition, and changes in the mechanical properties of track structures, which can impact ride smoothness and stability of the railways. Accurately estimating and monitoring settlement change with time of track foundation is critical for analyzing the state of tracks and providing proper maintenance in time [2,3].…”

Section: Introductionmentioning

confidence: 99%

A Multi-Depth Deflectometer/Global Navigation Satellite System Method for Measuring Concrete Slab Track Deformation

Bahati,

Le,

Lim

2023

Applied Sciences

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This study introduces a Multi-Depth Deflectometer (MDD) combined with a Global Navigation Satellite System (GNSS) which was developed for measuring the deformation of railway slab track layers. We newly designed the MDD with the addition of laser sensor modules for increasing precision in which the MDD head is fixed at the top of the track slab. The MDD/GNSS system can measure the relative deflection between each track layer as well as the total deflection at the top of the track slab, which makes it possible to evade the fixed condition problem of classical MDD. The new MDD/GNSS system was installed at the transition zone between a tunnel entrance and its embankment, which experienced high settlement levels prior to repair. The system was used to monitor whether the repaired concrete track foundation with pressurized cement grouting was stabilized effectively and what track layer position was most unstable so that it had the most influence. The GNSS system was designed and built for computing net settlement at each track layer even when the MDD could not be fixed firmly at the end point, which is a major drawback of classical MDD. The results obtained from MDD and GNSS measurements indicated significant potential in aiding railway track settlement measurements.

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“…Slab tracks, which largely eliminate track settlement and provide excellent stability, have become an essential part of modern high-speed rails [1]. Due to the growing demand for higher traveling speed and the need to construct high-speed rails in places with unfavorable environments, challenges for slab tracks are formidable, and related issues should be addressed [2]. Slab tracks are susceptible to differential foundation settlement, which requires extensive maintenance if defects occur.…”

Section: Introductionmentioning

confidence: 99%

“…For CRTS (China Railway Track System) I and CRTS III prefabricated slab tracks [2], the expansion joints of track slabs and concrete bases would reduce the stiffness of track structures, thus affecting the dynamic performance of inhomogeneous, layered foundations through local stress and stress concentration due to irregularities in structural geometry [6,7]. As a result of the geometry of concrete bases in ballastless slab tracks, the vibration intensities of the slabs at both ends were substantially stronger than those in the middle.…”

Section: Introductionmentioning

confidence: 99%

Stress distribution in roadbeds of slab tracks with longitudinal discontinuities

Luo

Feng

et al. 2022

Rail. Eng. Science

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Stress concentration occurs in the foundations of railway tracks where discontinuous components are located. The exacerbated stress under the expansion joints in slab tracks may trigger foundation failures such as mud pumping. Although the higher stress due to the discontinuities of track structures has been discussed in past studies, few focused on the stress response of roadbeds in slab tracks and quantitatively characterized the stress pattern. In this paper, we performed a dynamic finite element analysis of a track-formation system, incorporating expansion joints as primary longitudinal discontinuities. The configurations of CRTS III slab tracks and the contact conditions between concrete layers were considered. Numerical results show that longitudinal influencing length of induced stress on roadbed under wheel load relates to the contact conditions between concrete layers, increasing nonlinearly at a larger coefficient of friction. Given a measured coefficient of friction of 0.7, the calculated longitudinal influencing length (9.0 m) matches with field data. The longitudinal influencing length is not affected with the increasing velocity. As stress concentration arises with expansion joints, the worst-case scenario emerges when double-axle loads are exerted immediately above the expansion joints between concrete bases. A stress concentration factor Cv on the roadbed is proposed; it increases with the increasing velocity, changing from 1.33 to 1.52 at velocities between 5 and 400 km/h. The stress distribution on roadbeds transforms from a trapezoid pattern at continuous sections to a triangle pattern at points with longitudinal discontinuities. An explicit expression is finally proposed for the stress pattern on roadbed under expansion joints. Although structural discontinuities induce stress raiser, the extent of concentration is mitigated with increasing depth at different velocity levels.

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Design theories and maintenance technologies of slab tracks for high-speed railways in China: a review

Cited by 24 publications

References 20 publications

A simulation-based life cycle cost model for track form selection-implementation

A simulation-based life cycle cost model for track form selection-implementation

A Multi-Depth Deflectometer/Global Navigation Satellite System Method for Measuring Concrete Slab Track Deformation

Stress distribution in roadbeds of slab tracks with longitudinal discontinuities

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