Abstract
With the development of the underground utility tunnel in China, the safety evaluation during facility operation inside tunnels is increasingly important after construction. In contrast to fixed fire source in the traffic tunnel, the fire characteristics of the electric cable compartment of the utility tunnel with different ventilation modes are studied. Firstly, the thermal physical parameters of cable material are determined by experiment and numerical simulation. Different fire sealing and ventilation conditions are established according to the practical utility tunnel engineering in FDS. The maximum temperature and smoke gas concentrations are obtained, as well as the heat release rate. The results show that the utility tunnel fire has obvious differences compared with road tunnel fire, where the maximum ceiling temperature and the distributions of smoke is related to fire sealing and ventilation mode. Some suggestions related to evaluation and firefighting are provided for practical purposes.
Highlights
With the development of the underground utility tunnel in China, the safety evaluation during facility operation inside the tunnel is increasingly important after construction, especially the electric power cable compartment is threatened by fire catastrophes
Zhang and Gao [6] analyzed the CO concentration and temperature related to fire heat release rates and ventilation velocities and fire source locations using the support vector machine (SVM) regression method
In contrast with the road tunnel fire, the fire heat release rate of utility tunnel fire can be predicted with fire source and ventilation mode, the maximum ceiling temperature
Summary
With the development of the underground utility tunnel in China, the safety evaluation during facility operation inside the tunnel is increasingly important after construction, especially the electric power cable compartment is threatened by fire catastrophes. Li et al [4] proposed maximum gas temperature beneath the ceiling was related to the heat release rate and the longitudinal ventilation velocity. In contrast with the road tunnel fire, the fire heat release rate of utility tunnel fire can be predicted with fire source and ventilation mode, the maximum ceiling temperature. Tang et al [8] studied ceiling maximum temperature and longitudinal decay along the centerline of the tunnel with different transverse fire source locations. E maximum temperature with different sealing ratio and heat release rate has been studied in road tunnel fire, while it is important in utility tunnel fire as well. Tang et al [18] put forward a modified model to predict the maximum temperature of smoke flow beneath the ceiling with combined effect of ceiling single point extraction and longitudinal ventilation in tunnel fires. Temperature and smoke gas concentration are obtained, and the relation between them is proposed
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