Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire

Journal article

Li, J., Li, Y., Li, J., Zhong, H., Zhao, J. and Xu, D. (2023). Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire. Tunnelling and Underground Space Technology. 131, p. 104829. https://doi.org/10.1016/j.tust.2022.104829
AuthorsLi, J., Li, Y., Li, J., Zhong, H., Zhao, J. and Xu, D.
Abstract

This research aims to establish a series of small-scale experiments to analyze the effect of ramp slopes on the
temperature distribution of Liquefied Petroleum Gas (LPG) fire in a model branched tunnel under longitudinal ventilation. The heat release rate under experimental conditions reached 2.57 kW to 7.70 kW and five ramp slopes of 0 %, 3 %, 5 %, 7 % and 9 % were conducted. For a specific given bifurcation angle, the maximum exceedance temperature of the fire in the expanding region before the bifurcation angle is measured and analysed. Results show that the maximum exceedance temperature in the main tunnel increases as the ramp slope decreases, which is mainly because the stack effect enhances the entrainment of the air and accelerates the smoke flow. Furthermore, the modified model of the maximum exceedance temperature, which could consider the influence of ramp slope for a branch tunnel fire is established according to the experimental results. The predicted results agree well with those of the experimental study for the main tunnel. The results could provide a
reference and contribute to the knowledge of smoke extraction strategies designed for branched tunnels.

KeywordsMaximum exceedance temperature; Ramp slopes; Branched tunnels; Longitudinal ventilation
Year2023
JournalTunnelling and Underground Space Technology
Journal citation131, p. 104829
PublisherElsevier
ISSN0886-7798
Digital Object Identifier (DOI)https://doi.org/10.1016/j.tust.2022.104829
Web address (URL)https://www.sciencedirect.com/science/article/pii/S0886779822004692?via%3Dihub
Publication dates
Online04 Nov 2022
Publication process dates
Accepted24 Oct 2022
Deposited19 Aug 2024
Accepted author manuscript
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Open
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Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire - Revised Manuscript (Clean Version).docx
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