Calculation of the dynamic response of a viscoelastic railway structure based on a quasi-stationary approach

Chupin, Olivier; Martin, Antoine; Piau, Jean‐Michel; Hicher, Pierre Yves

doi:10.1016/j.ijsolstr.2014.02.035

Cited by 13 publications

(11 citation statements)

References 10 publications

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“…To achieve this objective, the measurements of the anchored displacement sensors installed in pairs on the asphalt and granular sections will first be compared. Then, the acceleration levels will be analyzed, in particular those obtained under the sleepers and at the base of the ballast layer, which strongly influence the wear and settlements of the ballast layer (Chupin and Piau, 2011a;Chupin et al, 2014;Martin, 2014).…”

Section: Comparison Of the Response Of The Structures With Granular Amentioning

confidence: 99%

Monitoring of railway structures of the high speed line BPL with bituminous and granular sublayers

Khairallah

Blanc²,

Cottineau³

et al. 2019

Construction and Building Materials

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Ballast deterioration, under dynamic loads, remains an important issue on high-speed tracks that can lead to high maintenance costs. This ballast deterioration leads to settlements. Several studies have shown that these settlements were linked to high accelerations produced in the ballast by high-speed train (HST) passages. The solution with bituminous underlayment was used since 1980s in several countries like United States, Italy, Spain, especially on high-traffic and high-speed lines (HSL). In France, the interest in this technique is recent. Following the East European HSL satisfactory behavior, a layer of asphalt concrete was used under the ballast layer of the Bretagne-Pays de la Loire (BPL) HSL. It is intended, in addition to the schedule savings and the protection of the subgrade during the construction phase, to reduce acceleration amplitudes produced at the passage of HST, to ensure moisture stability in the subgrade and thereby to decrease the maintenance costs of the tracks. BPL HSL includes 105 km of innovative track with an asphalt concrete (GB) ballast sublayer, and 77 km with a granular layer under the ballast (UGM). Out of the instrumented sections of the BPL track, 3 sections are constructed with GB subballast layer and one with a layer of UGM as a subballast layer. A total of 127 sensors that includes accelerometers, anchored displacement sensors, temperature and humidity probes, and extensometers are used. Sensors are placed at various positions and depths in the track structures. Data were first acquired during a speed up test phase, under controlled conditions, with the same train passing at speeds ranging from 160 to 352 km/h. This paper presents the different sensors used for the instrumentation as well as the acquisition system installed to collect all measurements. Data treatment and processing is explained in details. Finally, results obtained for different speeds are presented, with a focus on accelerometer and anchored displacement sensor measurements, on two sections, allowing, among others, comparisons between the response of structures with and without asphalt concrete. The role of the GB, as a subballast layer, in damping the vertical displacement of the sub ballast structure and reducing the accelerations peaks in the ballast layer for ballasted tracks is demonstrated.

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Section: Comparison Of the Response Of The Structures With Granular Amentioning

confidence: 99%

Monitoring of railway structures of the high speed line BPL with bituminous and granular sublayers

Khairallah

Blanc²,

Cottineau³

et al. 2019

Construction and Building Materials

View full text Add to dashboard Cite

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Section: Viscorail: a Numerical Program For The Computation Of The Dymentioning

confidence: 99%

“…The simulations performed in this paper are focused on the computation of the dynamic response of railway structures to trains moving at constant speed. To accomplish this, we use a numerical program based on semi-analytical methods previously described in [12,13]. For recall, the basic principle of this program, so-called ViscoRail, relies on a decoupling technique that consists in solving iteratively on one hand the track system composed of the rails and the sleepers and on the other hand the sub-structure modeled as a stack of semi-infinite layers (Figure 1).…”

Section: Viscorail: a Numerical Program For The Computation Of The Dymentioning

confidence: 99%

Reducing vertical acceleration in ballast layers of railways to mitigate geometrical disorders in high-speed lines

Martin¹,

Chupin²,

Piau³

et al. 2017

Int. J. Numer. Anal. Meth. Geomech.

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According to field feedbacks from high‐speed lines (HSL), the increase of train operating speeds is responsible for unusual fast evolving geometrical disorders in ballasted tracks. This paper deals with the search of solutions applicable at the design stage to mitigate these disorders. The starting point of the present work relies on the assumption, comforted by the literature, of a strong correlation between disorders and vertical accelerations in the ballast layer induced by the train passages. This led us focus herein on the calculation and the analysis of accelerations in the railway structure. The vertical accelerations (γz) are computed using the in‐house developed numerical program ViscoRail and on the basis of a reference HSL. These are shown to increase strongly with the train speed attesting to the link between the train speed and the geometrical disorders in ballast. Then, other simulations are run varying some structural parameters to evaluate their impact on the acceleration field γz. In that way, we show that decreasing the stiffness of the mechanical connection between the rails and the ballast, increasing the moment of inertia of the rails or the Young modulus of the sub‐ballast layer, leads to a decrease of γz and could provide solutions for the design of future HSL. The solution consisting in the incorporation of an asphalt sub‐ballast layer, as already experimented on sites, is finally examined in more details. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Nowadays, a number of numerical studies have been carried out to evaluate the performance of railway track structure induced by moving load (Filippov 1961;Sheng et al 1999;Vostroukhov, Metrikine 2003;Chupin et al 2014). However, it is quite difficult to obtain the precise dynamic response of the track structure theoretically due to the complexity of the interactions between the vehicle system and the railway system.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Dynamic Behaviour of Heavy-Haul Railway Track Induced by Heavy Axle Load

et al. 2019

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The damage to the track structure and the influence to the line deformation have greatly deteriorated with the increase of the axle load compared with that of the ordinary trains. However, there is a paucity of experimental research on the dynamic influence of the heavier haul freight trains on the railway tracks. The objective of this study is to investigate the dynamic behaviour of heavy-haul railway track induced by heavy axle load by field experimental tests. The wheel–rail dynamic force, the track structure dynamic deformation and the track vibration behaviour are measured and analysed when the train operates in the speed range from 10 to 75 km/h and the axle load of vehicles varies from 21 to 30 t. Comparisons between the results for the axle conditions of 25 and 30 t are made in this paper to reveal the axle load effects. It is demonstrated that part of the indicators reflecting the dynamic behaviour of the railway track increases approximately linearly with the train running speed and axle load, while others are influenced negligibly

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Calculation of the dynamic response of a viscoelastic railway structure based on a quasi-stationary approach

Cited by 13 publications

References 10 publications

Monitoring of railway structures of the high speed line BPL with bituminous and granular sublayers

Monitoring of railway structures of the high speed line BPL with bituminous and granular sublayers

Reducing vertical acceleration in ballast layers of railways to mitigate geometrical disorders in high-speed lines

Experimental Investigation on Dynamic Behaviour of Heavy-Haul Railway Track Induced by Heavy Axle Load

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