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AuthorNtotsios E.
AuthorThompson D.J.
AuthorHussein M.F.M.
Available date2020-04-01T06:54:47Z
Publication Date2019
Publication NameTransportation Geotechnics
ResourceScopus
ISSN22143912
URIhttp://dx.doi.org/10.1016/j.trgeo.2019.100256
URIhttp://hdl.handle.net/10576/13611
AbstractWith the development of non-ballasted track forms (often referred to as slab tracks) over the few last decades, it is important to understand their behaviour with respect to ground-borne vibration compared with the traditional ballasted tracks. This is important in deciding between the use of the two track forms. The present work aims to quantify the differences between slab tracks and ballasted tracks numerically by using the MOTIV model. This is a general and fully coupled three-dimensional model that works in the wavenumber-frequency domain. It can predict the vibration levels of the track and the ground due to the gravitational loading of a passing train and the wheel and rail unevenness. A comparative analysis between the two track types is presented in terms of ground vibration with emphasis given to the influence of the stiffness and inertial parameters of the two track forms. It is shown that, for the same fastener stiffness there are only small differences in ground vibration behaviour, with the mass of the track slab leading to reductions of 1–3 dB at frequencies above 16 Hz. However, if softer rail fasteners are used in the slab track, as is usual, this leads to further reductions above 63 Hz. The critical velocity on soft soil is also considered. Although there is little difference between the different tracks for a homogeneous ground, for grounds with a soft surface layer the critical velocity is increased by the slab bending stiffness. The maximum rail displacement is also smaller for a slab track than the equivalent ballasted track.
SponsorThe work described here has been supported by the EPSRC under the programme grant EP/M025276/1, ‘The science and analytical tools to design long life, low noise railway track systems (Track to the Future)’ and the MOTIV project (Modelling of Train Induced Vibration), grants EP/K005847/2 and EP/K006002/1. All data published in this article are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D1001.
Languageen
PublisherElsevier Ltd
SubjectBallasted track
Critical speed
Ground-borne vibration
MOTIV model
Slab track
TitleA comparison of ground vibration due to ballasted and slab tracks
TypeArticle
Volume Number21
dc.accessType Open Access


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