Abstract: A mortise and tenon joint applied to prefabricated rectangular tunnel is designed， and the static behavior and explosion resistance of prefabricated tunnel with this mortise and tenon joint are studied. A three-dimensional refined numerical model reflecting the nonlinear mechanical characteristics of the joint is established， and the TNT explosion simulation is realized by fluid-solid coupling analysis. The compressive bending capacity， explosion resistance and concrete damage characteristics of mortise joint and cast-in-situ joint under different confining pressures are compared and evaluated. The results show that the bending capacity of the new joint is slightly higher than that of the cast-in-situ joint rectangular tunnel. Under the same equivalent TNT explosive， the anti-explosion capacity of the new joint assembled rectangular tunnel is better than that of the cast-in-situ joint rectangular tunnel as a whole. The damage and failure of the new joint assembled rectangular tunnel mainly occurs in the steel column and roof wall joint area. The research results provide theoretical support for the structural design of prefabricated rectangular tunnel and disaster prevention and mitigation.

Key words: assembled tunnel; joint; static behavior; blast resistance; damage characteristics