Wang, T. orcid.org/0000-0003-4079-0687, Connolly, D.P. orcid.org/0000-0002-3950-8704, Luo, Q. et al. (2 more authors) (2023) Shakedown limit analysis of railway slab track foundations under train loading. Computers and Geotechnics, 161. 105620. ISSN 0266-352X
Abstract
Shakedown limit analysis is used to calculate the factor of safety of a structure subject to cyclic moving loading. It is a promising approach for railway slab track structural design because it can help identify the required layer thicknesses and material strength properties. However, the approach is based on an underlying assumption that the stress field in the train passage direction is invariant, which is violated for slab tracks in the vicinity of expansion joints. To address this issue, this paper proposes a novel shakedown limit analysis implementation that enables its use for slab tracks with joints. Firstly, a 3D finite element slab track model is developed to calculate the stress field profiles exerted on the subgrade surface. Analytical equations describing the shape of these profiles are then derived, considering locations along the slab track, including those near and far from expansion joints. Relationships are also derived to describe the stress field profile variation with depth, including both train-induced and geostatic stresses. Next, a lower-bound shakedown limit method is used to calculate the elastic shakedown limit based on the Mohr-Coulomb criterion using the computed stress fields. After the model is validated, shakedown limits are examined, considering various friction angles, cohesions, and Poisson's ratios. It is shown that the limit is reduced when the geostatic stresses in the ground are ignored. Furthermore, the shakedown limit is not always directly proportional to subsoil cohesion and increases with Poisson's ratio.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 Elsevier Ltd. All rights reserved. This is an author produced version of an article published in Computers and Geotechnics made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0) in accordance with the publisher's self-archiving policy. |
Keywords: | Shakedown limit; Railway slab track; Track expansion joints; Railway geostatic stress; Subgrade surface stress |
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: | 28 Sep 2023 11:25 |
Last Modified: | 05 Jul 2024 00:13 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.compgeo.2023.105620 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:203736 |