Attribute recognition model of fatalness assessment of rockburst in tunnel construction and its application

Geological conditions of tunnels are complex, and the rockburst disaster is frequent, causing serious economic losses and casualties, which bring great difficulties to the construction of projects. In order to analyze the rockburst risk of tunnel construction and provide a basis for construction safety, an 8-parameter rockburst hazard evaluation model is established on the basis of the attribute mathematics theory. Through the systematic collection and analysis of the cases of tunnel rockburst, the main influencing factors of rockburst are summarized. Considering the ease of obtaining the index of the tunnel construction site, the traditional evaluation index of rock explosion is improved, and 8 easy-to-obtain indicators are selected: rock nature, rock strength, rock integrity, ground stress size, groundwater condition, tunnel depth, tunnel section size and site construction. The property identification model of the rock explosion risk assessment is constructed. The subjective and objective factors are taken into account, and the combined empowerment method of analytic hierarchy process(AHP) and probability statistics is used to analyze the weighting of the indicator factors. The established rock explosion risk attribute identification model is applied to the Yakang Expressway’s Erlangshan tunnel, the results show that the evaluation results are in general good agreement with the actual excavation results, the feasibility and rationality of the method in the rock explosion risk evaluation is verified. The research results provide an effective way for the risk assessment of tunnel construction rock explosion disaster, which are of great significance to prevent the occurrence of tunnel rock explosion disaster and reduce the construction loss.