Large air chambers for rail tunnel exit regions

Alan E. Vardy, Feng Liu, Dubravka Pokrajac

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The purpose of this paper is to present an assessment of the potential for using large air chambers inside enlarged exit regions of tunnels instead of using long extensions outside tunnel entrances. The target is to prevent the emission of unacceptable micro-pressure waves (MPWs) regardless of the steepness of pressure waves reaching the special exit region, even when no counter-measures are implemented further upstream. The study is complementary to previous work in which multiple small air chambers are assumed to be distributed along a tunnel, under walkways, etc. It is found that exit regions with large chambers could be effective for wavefronts longer than about two tunnel diameters, but probably not for wavefronts shorter than about one tunnel diameter. A possible way of incorporating large chambers in tunnel end regions is hypothesised.
Original languageEnglish
Title of host publicationProceedings of the 19th International Symposium on Aerodynamics, Ventilation & Fire in Tunnels – Brighton, United Kingdom
PublisherFramatome BHR
Pages185-200
Number of pages16
Publication statusPublished - Oct 2022
Event19th International Symposium on Aerodynamics, Ventilation & Fire in Tunnels - Brighton, United Kingdom
Duration: 28 Sep 202230 Sep 2022

Conference

Conference19th International Symposium on Aerodynamics, Ventilation & Fire in Tunnels
Abbreviated titleISAVFT 2022
Country/TerritoryUnited Kingdom
CityBrighton
Period28/09/2230/09/22

Keywords

  • Counter-measures for MPWs
  • tunnel exit regions
  • air chambers
  • wavefront steepness
  • wavefront damping

Fingerprint

Dive into the research topics of 'Large air chambers for rail tunnel exit regions'. Together they form a unique fingerprint.

Cite this