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 language | English |
|---|---|
| Title of host publication | 17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 |
| Place of Publication | United States |
| Publisher | BHR Group Limited |
| Pages | 41-53 |
| Number of pages | 13 |
| ISBN (Print) | 9781510851665 |
| Publication status | Published - Dec 2017 |
| Event | 17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 - Lyon, France Duration: 13 Sept 2017 → 15 Sept 2017 |
Conference
| Conference | 17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 |
|---|---|
| Country/Territory | France |
| City | Lyon |
| Period | 13/09/17 → 15/09/17 |
ASJC Scopus subject areas
- Civil and Structural Engineering
- Safety, Risk, Reliability and Quality
- Building and Construction