Abstract: The mechanical behavior of opencut prefabricated tunnel structures is complex, the internal force conversion is frequent in the construction process, and there are multiple influencing factors and no mature analytical methods for a better understanding of the structure for future reference. Accordingly, key analytical ideas and conditions and load action are put forward in terms of the factors affecting the force, deformation, and stability of the structural system. As for the main influencing factors, such as joint stiffness, stratum constraint, foundation pit supporting system, foundation pit manure groove backfilling, and assembly error, the determination method and key points of calculation and analysis of the model are discussed. It is emphasized that it is necessary to analyze the effect of the actual work from construction to use, and reasonable means and methods should be considered regarding the influence of various elements and construction processes in the actual engineering design. The proposed multiple iteration analysis method is accurate and quick in analyzing the overall action of the prefabricated tunnel structure with a variable stiffness joint.

Key words: tunnel structure, opencut prefabricated structure, overall action effect, analysis model, variable stiffness joint model, multiple iteration method