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Modelling of ground-borne vibration when the train speed approaches the critical speed

Modelling of ground-borne vibration when the train speed approaches the critical speed
Modelling of ground-borne vibration when the train speed approaches the critical speed
When trains run on soft ground, large deflections of the track and vibration of the ground can occur when the train speed approaches the speed of Rayleigh waves in the ground. Modelling is helpful to understand and mitigate such critical velocity effects. Here, a three-dimensional time-domain model of a load moving on a track and ground has been developed with the finite element software ABAQUS. This allows nonlinear soil properties to be considered. In order to validate the approach, the vibration of the track and ground induced by a high speed train is compared with those from the site measurements carried out in the late 1990s at Ledsgård, Sweden. Due to the particularly soft soil at this site, it is necessary to adopt a nonlinear soil model due to the large deflections induced by the high-speed train. It is shown that using a linear model based on the small strain soil parameters leads to results which underestimate the displacements. Laboratory test data allow the nonlinear characteristics to be obtained. These have previously been used by various authors in an equivalent linear model. Here this approach is compared with a fully nonlinear model.
497-508
Springer
Shih, Jou-Yi
4878809e-bddf-40b1-8488-72967805a1dc
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Zervos, Antonios
9e60164e-af2c-4776-af7d-dfc9a454c46e
Shih, Jou-Yi
4878809e-bddf-40b1-8488-72967805a1dc
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Zervos, Antonios
9e60164e-af2c-4776-af7d-dfc9a454c46e

Shih, Jou-Yi, Thompson, David and Zervos, Antonios (2018) Modelling of ground-borne vibration when the train speed approaches the critical speed. In Noise and Vibration Mitigation for Rail Transportation Systems. vol. 139, Springer. pp. 497-508 . (doi:10.1007/978-3-319-73411-8_39).

Record type: Conference or Workshop Item (Paper)

Abstract

When trains run on soft ground, large deflections of the track and vibration of the ground can occur when the train speed approaches the speed of Rayleigh waves in the ground. Modelling is helpful to understand and mitigate such critical velocity effects. Here, a three-dimensional time-domain model of a load moving on a track and ground has been developed with the finite element software ABAQUS. This allows nonlinear soil properties to be considered. In order to validate the approach, the vibration of the track and ground induced by a high speed train is compared with those from the site measurements carried out in the late 1990s at Ledsgård, Sweden. Due to the particularly soft soil at this site, it is necessary to adopt a nonlinear soil model due to the large deflections induced by the high-speed train. It is shown that using a linear model based on the small strain soil parameters leads to results which underestimate the displacements. Laboratory test data allow the nonlinear characteristics to be obtained. These have previously been used by various authors in an equivalent linear model. Here this approach is compared with a fully nonlinear model.

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IWRN12_JouyiShih_Full_Paper.pdf - Accepted Manuscript
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More information

e-pub ahead of print date: September 2016
Published date: 20 May 2018
Venue - Dates: 12th International Workshop on Railway Noise, Australia, 2016-09-11 - 2016-09-15
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 399125
URI: http://eprints.soton.ac.uk/id/eprint/399125
PURE UUID: 8a60c2f2-f9fb-48a7-8171-4f57c0c98c0b
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906
ORCID for Antonios Zervos: ORCID iD orcid.org/0000-0002-2662-9320

Catalogue record

Date deposited: 05 Aug 2016 11:03
Last modified: 18 Feb 2021 17:00

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