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Study of the shadow effect caused by a railway tunnel

Study of the shadow effect caused by a railway tunnel
Study of the shadow effect caused by a railway tunnel
When a train runs in a tunnel the largest vibration on the ground surface may not occur directly above the tunnel but at some lateral distance away from the tunnel alignment. This has been called the ‘shadow effect’. The characteristics of this shadow effect can help in understanding the distribution of vibration on the ground surface. For the current study it is first shown, using an analytical ground model, that a shadow region may occur for a force at some depth in the ground even in the absence of a tunnel; the extent of this effect depends on the Poisson’s ratio of the soil. To introduce the tunnel a 2.5D finite element/boundary element model has been used to represent the coupled tunnel-ground situation. When the tunnel is present the vibration caused by excitation at the tunnel base shares many of the features found in the absence of the tunnel. However, the existence of the tunnel structure also influences these features, especially at high frequencies. It is found that, rather than the tunnel structure shielding the vibration from reaching the ground surface, its dominant effect is to transmit vibration from the tunnel base to the crown at high frequencies. The dependence of these effects on various parameters is studied, in particular the tunnel diameter, wall thickness and depth.
1742-6588
1-9
Jin, Qiyun
11ca2e62-580e-4ce5-807e-4a42632d4d15
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Jin, Qiyun
11ca2e62-580e-4ce5-807e-4a42632d4d15
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5

Jin, Qiyun and Thompson, David (2016) Study of the shadow effect caused by a railway tunnel. Journal of Physics: Conference Series, 1-9. (In Press)

Record type: Article

Abstract

When a train runs in a tunnel the largest vibration on the ground surface may not occur directly above the tunnel but at some lateral distance away from the tunnel alignment. This has been called the ‘shadow effect’. The characteristics of this shadow effect can help in understanding the distribution of vibration on the ground surface. For the current study it is first shown, using an analytical ground model, that a shadow region may occur for a force at some depth in the ground even in the absence of a tunnel; the extent of this effect depends on the Poisson’s ratio of the soil. To introduce the tunnel a 2.5D finite element/boundary element model has been used to represent the coupled tunnel-ground situation. When the tunnel is present the vibration caused by excitation at the tunnel base shares many of the features found in the absence of the tunnel. However, the existence of the tunnel structure also influences these features, especially at high frequencies. It is found that, rather than the tunnel structure shielding the vibration from reaching the ground surface, its dominant effect is to transmit vibration from the tunnel base to the crown at high frequencies. The dependence of these effects on various parameters is studied, in particular the tunnel diameter, wall thickness and depth.

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Accepted/In Press date: 12 August 2016
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 399622
URI: http://eprints.soton.ac.uk/id/eprint/399622
ISSN: 1742-6588
PURE UUID: a31bc9e8-ee46-4786-aeeb-9bdebe08c2a2
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906

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Date deposited: 22 Aug 2016 12:36
Last modified: 15 Mar 2024 05:50

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Contributors

Author: Qiyun Jin
Author: David Thompson ORCID iD

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