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Influence of soil non-linearity on the dynamic response of high-speed railway tracks
Geo Risk and Vibration Scandinavia AB.
2010 (English)In: Soil Dynamics and Earthquake Engineering, ISSN 0267-7261, E-ISSN 1879-341X, Vol. 30, no 4, 221-235 p.Article in journal (Refereed) Published
Abstract [en]

The main objectives of this paper are the evaluation of the relevance of the non-linear behaviour of the soil on the track response and the validation of a methodology, which includes these effects through an equivalent linear analysis. The proposed numerical model is based on 2.5D finite/infinite elements method, coupled with an iterative procedure in order to obtain an agreement between the strain levels and the dynamicproperties of the materials. In order to validate the model, the case study of Ledsgard was simulated, and the experimental and numerical results of displacements of the trackwere compared, considering several circulation speeds for the X2000 train. From the results, it is possible to recognize that the stiffness degradation, function of the strain level, plays a relevant role for the case of high-speed railway lines on soft ground. Moreover, the simulations developed with the proposed methodology provided similar results to those observed, independently of the train speed, contrary to what was obtained when the elastic linear model was used.

Place, publisher, year, edition, pages
2010. Vol. 30, no 4, 221-235 p.
Keyword [en]
2.5D finite element method, Equivalent linear analysis, Frequency-domain analysis, High-speed railway track, Soft soil
National Category
Geotechnical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-64569DOI: 10.1016/j.soildyn.2009.11.002ISI: 000274705800006OAI: oai:DiVA.org:kth-64569DiVA: diva2:483175
Note
QC 20120207Available from: 2012-01-24 Created: 2012-01-24 Last updated: 2017-12-08Bibliographically approved

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Bodare, Anders
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