Abstract: In order to understand the fire risk of utility tunnel, this paper explores the weight and mechanism of each risk factor, so as to enhance the fire risk control ability of underground utility tunnel. Firstly, based on the literatures related to building fire risk identification over the years, an index system was established by exploratory factor analysis method. Secondly, data samples were collected through questionnaires. Finally, the structural equation model is used to calculate the weight of each fire risk factor, and the potential influencing factors are deeply analyzed. The empirical results show that the fire prevention ability, personnel prevention and control ability, fire supervision ability and fire control system ability of the building have a positive effect on the fire risk control of the the tunnel. The results show that the correct selection of decorative materials and equipment the tunnel gallery is the key to fire prevention, and it is an important measure to perfect the supervision system and improve the safety quality of relevant personnel.

Key words: utility tunnel, fire risk, structural equation, exploratory factor analysis