About the author:

China Railway 11th Bureau Group No.4 Engineering Co., Ltd., Wuhan, Hubei 430073, China

Abstract:

To ensure the safety of super⁃large span tunnel construction and improve the efficiency oftunnel construction, data research, engineering analogy, theoretical analysis, numerical simulation, andother methods are used to study the construction method, large⁃scale construction equipment selection,and support parameters of super⁃large span tunnels based on the engineering example of Chengzishansuper⁃large span tunnel with two tunnels and eight lanes. According to the characteristics andrequirements of tunnel excavation sections and mechanized construction technology, the constructionmethod, large⁃scale construction equipment selection, and support parameters of super⁃large span tunnelswere studied,with safety and efficiency as the evaluation benchmark. The design system of themechanized construction method for super⁃large span tunnels based on the lithology distribution aroundthe tunnel was proposed, and both the applicability and feasibility of the design system were verified bynumerical simulation analysis of the actual projects. The results indicate that the stress and strain causedby construction are within the acceptable range, and the design system is reasonable and has the value ofpopularization.