Abstract: This paper presents a case history of Jintang Subsea Tunnel of Yongzhou Railway. The commercial software ANSYS/LS-DYNA is used to establish the finite element model by using the dynamic response of the lining structure under the eccentric explosion. The stress and displacement response of the segment lining, secondary lining and lane plate are also evaluated. The results show that the eccentric explosion of a 40kg TNT bomb mainly affects the safety of the local components, and the main countermeasures are to perform the local repair of the tunnel lining and the internal structure in time. The structure displacement caused by the eccentric explosion of a 40kg TNT bomb 14m away from the initiation section is small. The displacement of the lining nodes rapidly increases to the maximum value in a very short time, and then gradually decreases with a variation pattern close to the sinusoidal pulse, and the time of the peak displacement gradually moves backward with the increase of longitudinal distance.

Key words: Shielded Tunnel, Eccentric Explosion, Dynamic Response, Numerical Simulation