Abstract: By using the FDS numerical simulation method, the smoke movement characteristics of the V- shaped slope tunnel and the temperature distribution on the longitudinal centerline of the tunnel during a fire are studied, and an empirical prediction model for the maximum temperature rise parameters of the roof at different fire positions is proposed. The results show that when the fire source is 120 m away from the right of the slope change point, the peak temperature point of the longitudinal centerline of the tunnel shifts to the downstream direction, the shift distance increases with the increase of the slope, and the maximum temperature of the tunnel roof decreases with the increase of the slope. By deriving the prediction model of the maximum temperature rise parameter when the distance between the nondimensional fire source position and the variable slope point is different, it is concluded that the dimensionless maximum temperature rise parameter increases with the increase of the dimensionless fire source position, and is proportional to the 0.8th power of the dimensionless heat release rate, and has a nonlinear and non-monotonic relationship with the slope of the tunnel.

Key words: V- slope tunnel, fire smoke, maximum temperature rise, numerical simulation, non-dimensional analysis