Abstract
At present, there is no unified support design criterion for the construction of super-large cross-section tunnel. The design of initial supporting components is based on engineering analogy method, lacking theoretical and experimental guidance. The spacing of arch and longitudinal connection strength have significant influence on the bearing capacity of initial support system, so in-depth study in this area is very important. Therefore, based on the typical super-large cross-section tunnel-Letuan Tunnel of Binlai Expressway in China, laboratory test and numerical test are carried out in this paper to study the combinational bearing mechanism of multiple spatial arches in initial supporting system. This paper also clarifies the mechanical characteristics of spatial supporting system and the influence mechanism different designing parameters such as arch spacing, longitudinal connection spacing. The cost performance of each design scheme of the spatial supporting arch system is established. The research results show that the influence of arch spacing and longitudinal connection spacing on arch bearing capacity is remarkable. Strength of combined arch structures is 3.14–3.92 times of single arch frame. The influence of arch spacing is more obvious than that of longitudinal connection spacing. The research results can provide reference for related projects.
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