Abstract: First, the main achievements of Fujian Province in highway tunnel construction are introduced. Then, the typical tunnel inrush cases under different geological conditions are described, which are limestone, sandstone and granite with frequent inrush disasters. At the same time, according to the reasoning of inrush cases, the risk index system of highway tunnel inrush disaster is constructed. Aiming at the multi-parameter and uncertainty of the evaluation index, an unascertained measure model for tunnel inrush safety risk evaluation based on unascertained measure and information entropy is proposed. The unascertained measure function and the weight of the evaluation index are established respectively, and the tunnel inrush risk level is evaluated according to the confidence recognition criterion. Finally, a risk assessment of inrush disaster was carried out for the Xiafang tunnel of Beijing-Taiwan Expressway. It can not only realize the safety risk assessment of tunnel inrush disaster, but also establish an evaluation method that does not rely on expert experience and subjective weighting, which can provide reference for related research.

Key words: highway tunnels, inrush cases, risk assessment, unascertained measures, information entropy