Influence of air chambers on wavefront steepening in railway tunnels

Feng Liu; Alan E  Vardy; Dubravka Pokrajac

doi:10.1016/j.tust.2021.104120

Influence of air chambers on wavefront steepening in railway tunnels

Feng Liu, Alan E Vardy^* (Corresponding Author), Dubravka Pokrajac

^*Corresponding author for this work

Engineering

University of Dundee

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

4 Downloads (Pure)

Abstract

The behaviour of wavefronts propagating in a tunnel with multiple, compact air chambers is investigated with particular reference to the suppression of unacceptable pressure disturbances radiating from exit portals. Attention is focussed primarily on chambers that respond in an overdamped manner to pressure variations in the tunnel. In the early part of the paper, comparisons are made between the qualitative behaviour of wavefront propagation in tunnels with and without air chambers. Thereafter, attention turns to a quantitative assessment of the influence of key design parameters, especially the chamber volume and properties of connectors between chambers and the tunnel. It is shown that the optimum type of connector depends upon the length of the tunnel along which the chambers exist. For short tunnels, relatively low-resistance connectors with linear pressure: flow rate characteristics are preferred, whereas for long tunnels, relatively high-resistance Manuscript File Click here to view linked References connectors with quadratic pressure: flow rate characteristics are likely to be more suitable. Brief attention is paid to the practical feasibility of creating suitable connectors.

Original language	English
Article number	104120
Number of pages	11
Journal	Tunnelling and Underground Space Technology
Volume	117
Early online date	22 Aug 2021
DOIs	https://doi.org/10.1016/j.tust.2021.104120
Publication status	Published - Nov 2021

Bibliographical note

ACKNOWLEDGEMENTS
The authors are grateful to the following bodies that provided financial support for the project: (a) National Natural Science Foundation of China (grant no. 52002265), (b) China Scholarship Council (201806935055), (c) State Key Laboratory of Traction Power (grant no. TPL1904), (d) Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (grant no. 2019L0251), (e) Natural Science Foundation of Shanxi Province, China (grant no. 201801D221224).

CRediT authorship contribution statement
Feng Liu: Software, Validation, Investigation, Funding acquisition. Alan E. Vardy: Conceptualization, Methodology, Validation, Supervision, Writing – original draft. Dubravka Pokrajac: Supervision, Methodology, Project administration, Software, Validation.

Keywords

Wavefront steepening
rail tunnels
air chambers
micro-pressure waves

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© 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 1.96 MBLicence: CC BY-NC-ND

Cite this

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title = "Influence of air chambers on wavefront steepening in railway tunnels",

abstract = "The behaviour of wavefronts propagating in a tunnel with multiple, compact air chambers is investigated with particular reference to the suppression of unacceptable pressure disturbances radiating from exit portals. Attention is focussed primarily on chambers that respond in an overdamped manner to pressure variations in the tunnel. In the early part of the paper, comparisons are made between the qualitative behaviour of wavefront propagation in tunnels with and without air chambers. Thereafter, attention turns to a quantitative assessment of the influence of key design parameters, especially the chamber volume and properties of connectors between chambers and the tunnel. It is shown that the optimum type of connector depends upon the length of the tunnel along which the chambers exist. For short tunnels, relatively low-resistance connectors with linear pressure: flow rate characteristics are preferred, whereas for long tunnels, relatively high-resistance Manuscript File Click here to view linked References connectors with quadratic pressure: flow rate characteristics are likely to be more suitable. Brief attention is paid to the practical feasibility of creating suitable connectors. ",

keywords = "Wavefront steepening, rail tunnels, air chambers, micro-pressure waves",

author = "Feng Liu and Vardy, {Alan E} and Dubravka Pokrajac",

note = "ACKNOWLEDGEMENTS The authors are grateful to the following bodies that provided financial support for the project: (a) National Natural Science Foundation of China (grant no. 52002265), (b) China Scholarship Council (201806935055), (c) State Key Laboratory of Traction Power (grant no. TPL1904), (d) Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (grant no. 2019L0251), (e) Natural Science Foundation of Shanxi Province, China (grant no. 201801D221224). CRediT authorship contribution statement Feng Liu: Software, Validation, Investigation, Funding acquisition. Alan E. Vardy: Conceptualization, Methodology, Validation, Supervision, Writing – original draft. Dubravka Pokrajac: Supervision, Methodology, Project administration, Software, Validation.",

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doi = "10.1016/j.tust.2021.104120",

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AU - Vardy, Alan E

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N1 - ACKNOWLEDGEMENTS The authors are grateful to the following bodies that provided financial support for the project: (a) National Natural Science Foundation of China (grant no. 52002265), (b) China Scholarship Council (201806935055), (c) State Key Laboratory of Traction Power (grant no. TPL1904), (d) Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (grant no. 2019L0251), (e) Natural Science Foundation of Shanxi Province, China (grant no. 201801D221224). CRediT authorship contribution statement Feng Liu: Software, Validation, Investigation, Funding acquisition. Alan E. Vardy: Conceptualization, Methodology, Validation, Supervision, Writing – original draft. Dubravka Pokrajac: Supervision, Methodology, Project administration, Software, Validation.

PY - 2021/11

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N2 - The behaviour of wavefronts propagating in a tunnel with multiple, compact air chambers is investigated with particular reference to the suppression of unacceptable pressure disturbances radiating from exit portals. Attention is focussed primarily on chambers that respond in an overdamped manner to pressure variations in the tunnel. In the early part of the paper, comparisons are made between the qualitative behaviour of wavefront propagation in tunnels with and without air chambers. Thereafter, attention turns to a quantitative assessment of the influence of key design parameters, especially the chamber volume and properties of connectors between chambers and the tunnel. It is shown that the optimum type of connector depends upon the length of the tunnel along which the chambers exist. For short tunnels, relatively low-resistance connectors with linear pressure: flow rate characteristics are preferred, whereas for long tunnels, relatively high-resistance Manuscript File Click here to view linked References connectors with quadratic pressure: flow rate characteristics are likely to be more suitable. Brief attention is paid to the practical feasibility of creating suitable connectors.

AB - The behaviour of wavefronts propagating in a tunnel with multiple, compact air chambers is investigated with particular reference to the suppression of unacceptable pressure disturbances radiating from exit portals. Attention is focussed primarily on chambers that respond in an overdamped manner to pressure variations in the tunnel. In the early part of the paper, comparisons are made between the qualitative behaviour of wavefront propagation in tunnels with and without air chambers. Thereafter, attention turns to a quantitative assessment of the influence of key design parameters, especially the chamber volume and properties of connectors between chambers and the tunnel. It is shown that the optimum type of connector depends upon the length of the tunnel along which the chambers exist. For short tunnels, relatively low-resistance connectors with linear pressure: flow rate characteristics are preferred, whereas for long tunnels, relatively high-resistance Manuscript File Click here to view linked References connectors with quadratic pressure: flow rate characteristics are likely to be more suitable. Brief attention is paid to the practical feasibility of creating suitable connectors.

KW - Wavefront steepening

KW - rail tunnels

KW - air chambers

KW - micro-pressure waves

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DO - 10.1016/j.tust.2021.104120

M3 - Article

SN - 0886-7798

VL - 117

JO - Tunnelling and Underground Space Technology

JF - Tunnelling and Underground Space Technology

M1 - 104120

ER -

Influence of air chambers on wavefront steepening in railway tunnels

Abstract

Bibliographical note

Keywords

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