Abstract
To address fire safety of cable compartment in urban utility tunnel, provision of fire separation is necessary, and identifying a fire separation distance that is both safe and practical is thus of great importance. This paper studies the cable compartment fire occurring and development pattern, fire smothering, post-fire ventilation, and smoke exhausting under different fire separation distances by CFD numerical simulation. This paper proposes a general process for fire smothering in cable compartment of urban utility tunnel and comes up with a series of judging criteria for the best fire door opening time. The research discovers that under different fire separation distances, there is not big difference in maximum heat release rate (HRR) as well as the maximum temperature and smoke layer settling rate in the utility tunnel. After fire door is opened, the smoke exhaust time with an 800 m fire separation distance is obviously higher than any other fire separation distance. We believe that the present mainstream 200 m fire separation distance can be properly increased no matter from the perspective of fire spreading control or post-fire ventilation, for example, no excess of 500 m. The research results of this paper can provide theoretical basis for fire safety design and management of urban utility tunnels.
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Abbreviations
- t REST :
-
Required safe evaluation time (s)
- t b :
-
Early warning time (s)
- t c :
-
Response time (s)
- t s :
-
Evaluation time (s)
- t close :
-
Fire door closing time (s)
- t open :
-
Fire door opening time (s)
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Acknowledgements
This study is financially supported by the National Key Research and Development Project of China through grants 2017YFC0805000 and 2016YFC0802500, National Science Fund for Excellent Young Scholars through grant 51622403, and Beijing Science and Technology Special Project through grant Z171100001117145. This work is also funded by the Fundamental Research Funds for China Academy of Safety Science and Technology through grants 2019JBKY01 and 2019JBKY02.
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Li, J., Shi, C., Chen, C., Zhang, Y., Xu, X., Shi, J. (2020). Fire Smothering and Post-fire Ventilation Strategy for Cable Compartment in Urban Utility Tunnel. In: Wu, GY., Tsai, KC., Chow, W.K. (eds) The Proceedings of 11th Asia-Oceania Symposium on Fire Science and Technology. AOSFST 2018. Springer, Singapore. https://doi.org/10.1007/978-981-32-9139-3_75
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DOI: https://doi.org/10.1007/978-981-32-9139-3_75
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