Abstarct: Nowadays, In addition to connecting two points, tunnels are also used in passive defense and explosion-proof structures. In the event of an explosion in the tunnels, whether it is an explosion of Excavation or an explosion inside the tunnel, there is a possibility of irreparable economic damage, and serious damage may be done to the structure supporting the tunnel. Both temporary and permanent tunnel support structures are used. . Support systems typically include steel profiles or lattice girders that integrate with shotcrete to provide resistance to control tunnel convergence and prevent damage. In this thesis, the dynamic parameters resulting from the explosion of the fire pattern on the temporary maintenance of the tunnel, which is in cross-section equivalent to lattice girder (mesh frxame) and shotcrete, are investigated. It is very important to study the dynamic reaction of the structure to the vibration of the explosion. For this purpose, after selecting the appropriate rock in which the conditions of use of the equivalent cross-section of lattice girder and shotcrete are required, these effects are investigated under the forces caused by the explosion of the pattern used. Then, the characteristics of the dynamic response of the temporary tunnel structure were discussed. The particle peak velocity (PPV) criterion is used to evaluate tunnel safety under dynamic loads. If the element's velocity exceeds 0.9 meters per second, it will be destroyed. During the study of the elements of the temporary support structure of the tunnel, it is observed that this structure is damaged at the location closest to the core of the tunnel, and is damaged up to a distance of 2 meters from it. Fluid-structure interaction(FSI) to analyze the complexities of the shock wave of the explosion, the finite element software LS-DYNA is used