Safety Evaluation of Super Deep Shaft Construction of Donghu Deep Tunnel in Wuhan

With the rapid development of infrastructure construction in large and medium-sized cities in China, the development and utilization of underground space has been developed rapidly. The sewage transmission system engineering of Donghu core area in Wuhan is faced with the construction of shaft under smaller section, deeper foundation pit and more complex environment. The safety of super-deep shaft construction is evaluated and the important risk influencing factors are identified. From the point of view of construction process and method, this paper identifies and constructs the evaluation index system of safety risk in deep tunnel shaft construction, and then constructs the evaluation model with binary semantics and AHP and entropy weight method. Finally, the empirical analysis is carried out through the example of Wuhan East Lake deep tunnel project. The empirical results show that the foundation pit support, water stop curtain, wellhead instability, vertical ventilation of shaft and rock entry blasting are the factors that affect the construction safety risk of the project, and the construction safety risk evaluation grade of the project is low. This paper also puts forward effective measures to improve the construction safety of the project.

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