Smoke Movement in a Sloping Subway Tunnel Under Longitudinal Ventilation with Blockage

Zhu, K, Yao, Y, Zhang, S, Yang, H, Zhang, R, Cheng, X and Shi, L 2017, 'Smoke Movement in a Sloping Subway Tunnel Under Longitudinal Ventilation with Blockage', Fire Technology, vol. 53, no. 6, pp. 1985-2006.


Document type: Journal Article
Collection: Journal Articles

Title Smoke Movement in a Sloping Subway Tunnel Under Longitudinal Ventilation with Blockage
Author(s) Zhu, K
Yao, Y
Zhang, S
Yang, H
Zhang, R
Cheng, X
Shi, L
Year 2017
Journal name Fire Technology
Volume number 53
Issue number 6
Start page 1985
End page 2006
Total pages 22
Publisher Springer
Abstract Critical velocity and smoke back-layering length are two of the determining parameters to the fire risk assessment of subway tunnel. These two parameters of a sloping subway tunnel with train blockage were investigated both experimentally and numerically in this paper. To address the influences of slope, the slopes of 0, 3, 6, 9, 12, 15% in downhill subway tunnel were studied and the height (H) of the tunnel was replaced by the inclined tunnel height ((Formula presented.)). The train model with a dimension of 2 m (length) × 0.3 m (width) × 0.38 m (height) was also chosen in simulations and experiments for the tunnel blockage. Thenceforward, 30 reduced-scale experimental and 150 numerical scenarios were analyzed to predict the critical velocity and smoke back-layering length in various sloping subway tunnels. Six different heat release rates including 5.58, 11.17, 16.67, 22.35, 27.94, and 33.52 kW were considered in the experiments and five different heat release rates including 2.79, 5.58, 8.38, 11.17 and 16.67 kW were considered in the simulations. Based on the comparison in the horizontal tunnel, numerical results were quite consistent with the experiments. The results showed that train blockage influenced the smoke back-layering length, and the critical velocity increases with the tunnel slope. Finally, empirical models were developed to predict the critical velocity and smoke back-layering length in a sloping subway tunnel with train blockage.
Subject Construction Materials
Keyword(s) Back-layering length
Critical velocity
FDS simulation
Slope tunnel
Subway tunnel fire
Tunnel blockage
DOI - identifier 10.1007/s10694-017-0667-x
Copyright notice © 2017 Springer Science and Busines Media, LLC.
ISSN 0015-2684
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