Numerical study on the smoke movement and control in main roadway for mine fires occurred in branch

Zhu, Hongqing; Qu, Baolin; Wang, Jingxin; Hu, Lifen; Yao, Yongzheng; Qi, Ling

doi:10.1016/j.csite.2023.102938

Cited by 12 publications

(1 citation statement)

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“…An enormous amount of research has been carried out in consideration of the aforementioned relationship. References [11][12][13][14][15][16][17][18][19][20][21] have indicated a connection between the critical longitudinal ventilation velocity of tunnels and various factors. These factors include fire power [11,12], fire location [13][14][15][16][17][18], tunnel geometry [15,16], blockage rate [19][20][21], and among others.…”

Section: Introductionmentioning

confidence: 99%

Study on critical velocity in tunnels with ceiling beams

Tian,

Xiang,

et al. 2024

Journal of Intelligent Construction

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Keywordscritical velocity heat release rate blocking ratio tunnel fire ceiling beamsCeiling beams at the top of tunnels are more common in actual projects. Under the influence of thermal buoyancy, the ceiling structure significantly affects the diffusion characteristics of fire smoke within the tunnel. This study investigated the influence of ceiling structural characteristics (beam height (h B ) and beam spacing (d B )) on tunnel longitudinal ventilation through numerical simulation. The results show that the spacing between tunnel ceiling beams has negligible impact on the critical velocity (V), and the determination of the critical velocity is primarily correlated with the height of the ceiling beams. Moreover, it established a dimensionless critical velocity (V c ) model for the tunnels with multiple beams in the ceiling, and this model is suitable for predicting the critical longitudinal velocity of tunnels with ceiling beams whose dimensionless beam height is less than 0.25. When the dimensionless beam height exceeds 0.25, the predictive values of this model are excessively high. This study broadens the application scope of fire smoke control models, which can offer technical support for the design of smoke prevention and exhaust systems in tunnels with similar structures.

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