Influence of shaft: tunnel geometry on steep pressure waves

H. Wang, A. E. Vardy

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

Abstract

The influence of the geometry of intersections between shafts and tunnels is assessed with particular reference to consequences for the reflection and transmission of wavefronts at shafts. It is found that, for low frequency waves, the local geometry is of relatively low importance and that the influence of shafts can be predicted quite well by 1D methodologies. In contrast, with higher-frequency waves typical of, say, the lower range of audible frequencies, 3D effects can be important, especially for waves propagating along the shafts themselves. It follows that the influence of the geometry of the intersections could be of greater importance for micro-pressure radiation from shaft portals than for radiation from tunnel portals. The main part of the paper is based on 1D and 3D simulations of conditions that are closely controlled, but use is also made of previously published measurements of pressures in a 1/25th scale physical model.

Original languageEnglish
Title of host publication17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
Place of PublicationUnited States
PublisherBHR Group Limited
Pages41-53
Number of pages13
ISBN (Print)9781510851665
Publication statusPublished - Dec 2017
Event17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 - Lyon, France
Duration: 13 Sep 201715 Sep 2017

Conference

Conference17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
CountryFrance
CityLyon
Period13/09/1715/09/17

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  • Cite this

    Wang, H., & Vardy, A. E. (2017). Influence of shaft: tunnel geometry on steep pressure waves. In 17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 (pp. 41-53). BHR Group Limited.