Castanheira-Pinto, A, Fernández-Ruiz, J, Colaço, A et al. (2 more authors) (2022) A simplified approach for predicting the non-linear critical speed of railway tracks. Transportation Geotechnics, 37. 100865. ISSN 2214-3912
Abstract
When trains approach the railway track-ground critical speed ground deformations are amplified, potentially exceeding the linear-elastic strain range in the supporting earthworks. This leads to non-linear soil behavior which can be difficult to model due to high computational cost and the need for detailed characterization of soil properties. As a solution, for the first time this research presents a simplified methodology to calculate the non-linear critical speed of track-ground structures. The methodology uses a novel semi-analytical approach that combines dispersion curves with a simplified linear equivalent model. Using the approach, a track-ground static strain field is first calculated, and then converted into a dynamic one using a non-dimensional dynamic amplification function, independent of the elastic properties of the soil. The result allows the non-linear critical speed to be calculated using static simulation results which are relatively straightforward to generate. The methodology is validated using a 3D non-linear Hardening Soil-small (HSSmall) numerical model and then a parametric study is used to compare results for both concrete slab and ballasted tracks. The results show the proposed approach is a reliable tool for predicting the non-linear critical speed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 Published by Elsevier Ltd. "This is an author produced version of an article published in Transportation Geotechnics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Simplified railway dynamics methodolog; Non-linear critical speed; Railway dispersion curve technique; Non-dimensional dynamic amplification functions; Railway track dynamics; Railroad geodynamics |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Dec 2022 13:36 |
Last Modified: | 23 Sep 2023 00:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.trgeo.2022.100865 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:193943 |