Underground structures, in addition to all their usual uses, are used during wartime and during air strikes and missiles as shelters to protect people's lives and protect important equipment, such as underground stations in Moscow Known as Underground museums.
Metro is one of the centers of citizens' gathering, which can therefore be considered one of the best targets of attacks.
Therefore, studying the behavior of underground structures against explosions is very important and will be investigated in this study.
The route of a city train of Ahwaz with an approximate length of 23 km has 23 stations connecting the north-east of Ahwaz to the southwest of Ahwaz via the city center and the Karun River. Part of the Ahwaz subway tunnel that passes through the Karon River is an important and critical part of the urban train line due to its passage through the water and soil. If ground rockets penetrate the tunnel and destroy the connections of bit segments, the water will penetrate into the tunnel, causing damage to the entire city system as well as causing damage.
Considering the importance of this section of the tunnel in this study, we intend to study its case study under the explosion outside the tunnel.