Numerical simulation study on temperature field of underwater tunnel fire

To explore the rationality of the design of the top fireproof panel and side wall decorative panel for the Karnaphuli River Tunnel in Bangladesh, a numerical model considering intermediate and offset fire sources was established using the fire simulation software FDS, and the temperature field distribution of tunnel fires was studied. The results show that the high-temperature area inside the tunnel is mainly concentrated near the fire source, and the most dangerous position of the structure is located at the arch position near the fire source. The average highest temperature of the middle fire source and the offset fire source are 496°C and 561°C, respectively. The average temperature of the other areas except for the fire source does not exceed 300°C; Under both the middle fire source and the offset fire source conditions, the temperature inside the tunnel shows a distribution of higher arch temperature and lower lower lower space temperature. In the stable stage, the temperature of the side wall is not higher than 200°C. The design of the top fireproof board and side wall decorative panels of the tunnel is safe and feasible.