Dynamic subsoil responses of a stiff concrete slab track subjected to various train speeds: A critical velocity perspective

Nsabimana, Ernest; Jung, Young-Hoon

doi:10.1016/j.compgeo.2015.04.012

Cited by 28 publications

(6 citation statements)

References 28 publications

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“…The dynamic response of slab track was also studied with different train speeds and subsoil stiffnesses, and the critical velocity was modelled using 2D FEM in Ref. [103]. According to this study, the critical velocity at which maximum dynamic amplification occurs for subsoil is completely different from that observed for concrete slab tracks, and a similar finding was also described by Krylov [23].…”

Section: The Dynamics Of Slab Track Railwaysmentioning

confidence: 61%

A Review of Numerical Models for Slab-Asphalt Track Railways

et al. 2022

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Higher train speeds and heavier axle loads trigger elevated stresses and vibrations in the track, potentially increasing track deterioration rates and maintenance costs. Alternative track forms made of combinations of reinforced concrete and asphalt layers have been developed. A thorough understanding of the slab and asphalt tracks is needed to investigate track performance. Thus, analytical and numerical models have been developed and validated by many researchers. This paper reviews numerical models developed to investigate railway track performance. The synthesis of major finite element models is described in detail, highlighting the main components and their outputs. For slab track models, the use of a structural asphalt layer within the railway track remains an active research topic and firm conclusions on its efficacy are not yet available. It can be expected that slab track structures will also be affected by train-induced ground vibrations. There is thus a gap in the literature regarding the measurement of dynamic effects on high-speed railway lines, and further research is needed to investigate the dynamic behaviour of slab–asphalt track systems. In this review, novel solutions for mitigating the vibrations in high-speed rail are discussed and compared. The use of asphalt material in railways appears to have beneficial effects, such as increasing the bearing capacity and stiffness of the structure and improving its dynamic performance and responses, particularly under high-speed train loads.

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Section: The Dynamics Of Slab Track Railwaysmentioning

confidence: 61%

A Review of Numerical Models for Slab-Asphalt Track Railways

et al. 2022

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“…2D models are used to investigate the vertical track performance, which are based on the widely used formulation called beam on elastic foundation (BOEF). The vast majority of railway track models have evolved from the Euler-Bernoulli beam placed over a spring-dashpot-mass model [17,23] or based on finite element (FE) models created using commercial software [24]. However, 2D models are not fully capable of simulating the ground-borne vibration and wave propagation.…”

Section: Track Modelsmentioning

confidence: 99%

Numerical analysis of high-speed railway slab tracks using calibrated and validated 3D time-domain modelling

Esen,

Laghrouche,

Woodward

et al. 2023

Rail. Eng. Science

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Concrete slabs are widely used in modern railways to increase the inherent resilient quality of the tracks, provide safe and smooth rides, and reduce the maintenance frequency. In this paper, the elastic performance of a novel slab trackform for high-speed railways is investigated using three-dimensional finite element modelling in Abaqus. It is then compared to the performance of a ballasted track. First, slab and ballasted track models are developed to replicate the full-scale testing of track sections. Once the models are calibrated with the experimental results, the novel slab model is developed and compared against the calibrated slab track results. The slab and ballasted track models are then extended to create linear dynamic models, considering the track geodynamics, and simulating train passages at various speeds, for which the Ledsgård documented case was used to validate the models. Trains travelling at low and high speeds are analysed to investigate the track deflections and the wave propagation in the soil, considering the issues associated with critical speeds. Various train loading methods are discussed, and the most practical approach is retained and described. Moreover, correlations are made between the geotechnical parameters of modern high-speed rail and conventional standards. It is found that considering the same ground condition, the slab track deflections are considerably smaller than those of the ballasted track at high speeds, while they show similar behaviour at low speeds.

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“…The damping constant of the material, first resonant frequency, and the applied highest load frequency were depicted as ξ, ω 1 and ω 2 . ω 1 was computed from the modal analysis of the structure (Nsabimana and Young-hoon, 2015). In contrast, ω 2 is the highest loading velocity and is calculated as per Eq.…”

Section: Materials Damping and Infinite Boundariesmentioning

confidence: 99%

A comparative study of geosynthetically reinforced earth foundations in multi-utility transportation infrastructure for high-speed railways

Mandhaniya,

Soni,

Choudhary

et al. 2023

Front. Built Environ.

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A high-quality railway track resting on an excellent foundation is required to support high-speed railway transportation. The foundations of high-speed railway tracks are generally constructed on the lifted embankment with the improved ground using different reinforcement agents like geosynthetics and rigid lateral support. The present study performed dynamic finite element simulations on a ballasted rail track laid over a geosynthetically reinforced embankment with and without facing wall support. Three foundation geometries were analyzed to examine the effect of facing wall support and geosynthetics on the lateral resistance of the foundation. An area loaded with a constant pressure was moved at a constant speed, causing the load motion at different speeds in the 90–360 km/h range. Different parameters were calculated at node paths to help understand the lateral effect of moving load. The results showed that the lateral resistance based on nodal acceleration and velocity increased with facing wall support in the range of 40%–57%. Any increment over the minimum facing wall thickness of 300 mm does not significantly increase lateral resistance. Geosynthetics provided a vital function in the foundations with a less bulk volume of soil and increased the lateral resistance by 10%.

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Dynamic subsoil responses of a stiff concrete slab track subjected to various train speeds: A critical velocity perspective

Cited by 28 publications

References 28 publications

A Review of Numerical Models for Slab-Asphalt Track Railways

A Review of Numerical Models for Slab-Asphalt Track Railways

Numerical analysis of high-speed railway slab tracks using calibrated and validated 3D time-domain modelling

A comparative study of geosynthetically reinforced earth foundations in multi-utility transportation infrastructure for high-speed railways

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