ABSTRACT
Large scale tunnel fires often caused considerable material damage, not only to vehicles, but also to the tunnel facilities as well.The damage was brought about by the massive development of heat and aggressive combustion gases, which led to enormous difficulties to reconstruction of tunnel. In order to provide the road tunnel with effective fire protection measures, it is important to predict the vault temperature in different road tunnel fire scenarios. There were some experiments on testing the structure characteristics under fire. But most of them were tested by following the standard temperature-time curve (Yasuda et al., 2004). Very few data are available on maximum smoke temperature under the tunnel ceiling with different ceiling heights, longitudinal ventilation velocities and fire intensities. Based on CFD models, the simulation analysis of a lorry and car fire in large cross-section road tunnel was carried out in this paper. The vault temperature was simulated and compared with the value calculated by correlative empirical equation. The corresponding results would be contributed to provide effective technique for the fire protection measures of the major structure of road tunnel.
