Lyu, P., Luo, Q., Feng, G. et al. (3 more authors) (2024) Development of an in-situ shaker for evaluating railway earthworks. Soil Dynamics and Earthquake Engineering, 179. 108550. ISSN 0267-7261
Abstract
The geotechnical and geodynamic characteristics of railway earthworks under train loading are important quantities for railway and geotechnical engineers, but difficult to quantify. Characterizing the anticipated settlement and dynamic properties of compacted fills after earthwork construction, but before track laying, is advantageous, because modifying construction after laying the track is significantly more expensive. The difficulty in measuring these indices arises from the need to perform cyclic loading that realistically simulates the frequencies and magnitudes induced by trains. To address this issue, this paper introduces a novel shaker designed to apply cyclic loads similar to those of trains. The paper first presents an outline of the design requirements for the shaker, followed by the development of a theoretical dynamics model to aid mechanical design. This model is used for examining various shaker configurations, especially their performance under different potential testing conditions. The shaker's final design includes dual eccentric rotors that excite an adjustable-mass counterweight, complemented by a lateral support frame to counter horizontal movement and ensure vertical excitation. Once the shaker is built, it is used to evaluate newly constructed mudstone earthworks near a railway line. A method for estimating the dynamic stiffness and damping of earthworks is proposed, which uses data from frequency sweep test data from the shaker. Outputs from the dynamics model show close alignment with the field results. Finally, a method for designing the shaker configuration according to the desired loads is proposed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. This is an author produced version of an article published in Soil Dynamics and Earthquake Engineering. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Railway earthworks; Non-destructive testing; Dual-rotor shaker; Frequency sweep; Fill compaction |
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: | 21 Oct 2024 10:43 |
Last Modified: | 21 Feb 2025 01:13 |
Published Version: | https://www.sciencedirect.com/science/article/pii/... |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.soildyn.2024.108550 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:218607 |