Identification of Critical Financing Risk Factors in Urban Underground Utility Tunnel Based on Complex Network

The urban underground utility tunnel project has begun to be actively promoted and popularized in China. Simultaneously, to effectively ensure the smooth development of the utility tunnel project, the potential impact of the project financing risk must not be overlooked. Firstly, the system of risk factors for utility tunnel financing should be established from the perspective of each participant and the whole life cycle. Similarly, the coupling relationship and degree of risk should also be identified based on the complex network theory, and a weighted directed network diagram should also be constructed. Subsequently, based on the risk level of the risk factor itself along with its local and global influence on various other factors in the network, the importance evaluation index of the risk factor is successfully designed. Finally, the BWM-PROMETHEE II method has been employed to rank the importance of risk factors and to successfully filter out the key risk factors. The results indicated that the approval delay risk, contract risk, entry tunnel pricing risk and interest rate risk were the key risk factors involved.