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The deformation of surrounding rock is an expected geological hazard when the tunnel passes through the area with unfavorable geological conditions. If the surrounding rock deformation is too large, it will lead to serious safety hazards. In this paper, the entropy weight method is adopted to calculate the weight of each index. Based on the extension theory, the risk evaluation model of tunnel surrounding rock deformation is established. Five evaluation indexes, such as surrounding rock grade, tunnel depth, groundwater status, the uniaxial compressive strength of rock, and rock integrity, were selected to evaluate the deformation risk of surrounding rock in 10 sections of Sheta Village tunnel of Zhangjihuai high-speed railway. The results show that the surrounding rock deformation is high in 2 of the 10 cavities to be evaluated, and the workers must take reinforcement measures to strengthen the surrounding rock, which is of considerable significance to guide the scientific and reasonable construction of the tunnel.

The risk assessment of tunnel surrounding rock deformation based on entropy weight method and extension matter element method