Abstract Seismic studies have shown that damages could vary greatly to tunnels with different depths. In view of this, this paper analyzes the typical seismic characteristics and damage mechanisms at the tunnel portal area. By esablishing a 3D finite element numerical model, this paper is based on the soil-structure interaction with a focus on the ground seismic response of the tunnel structure in the shallow overburden area at the portal with different depths and the damage mechanism of the tunnel lining. The results show that the soil-structure interaction plays a controlling role in the force-induced deformation of the tunnel lining, and the shear force-induced deformation of the strata can directly reflect the deformation mode of the lining and the characteristics of the stratum vibration pattern. In addition, the force of the soil-structure interaction, the plastic deformation of the surrounding rock and the damage distribution of the lining structure all indicate that different areas, such as the side and foot of the arch, play a controlling role in the overall stability of the tunnel structure, and it is recommended that the surrounding rock in these areas be reinforced.
Abstract：
Seismic studies have shown that damages could vary greatly to tunnels with different depths. In view of this, this paper analyzes the typical seismic characteristics and damage mechanisms at the tunnel portal area. By esablishing a 3D finite element numerical model, this paper is based on the soil-structure interaction with a focus on the ground seismic response of the tunnel structure in the shallow overburden area at the portal with different depths and the damage mechanism of the tunnel lining. The results show that the soil-structure interaction plays a controlling role in the force-induced deformation of the tunnel lining, and the shear force-induced deformation of the strata can directly reflect the deformation mode of the lining and the characteristics of the stratum vibration pattern. In addition, the force of the soil-structure interaction, the plastic deformation of the surrounding rock and the damage distribution of the lining structure all indicate that different areas, such as the side and foot of the arch, play a controlling role in the overall stability of the tunnel structure, and it is recommended that the surrounding rock in these areas be reinforced.
YU Lingfeng
.Research on the Characteristics of Structural Dynamic Response and the Seismic Mechanism of Mountain Tunnels with Different Depths[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(3): 227-235
2022, Vol. 59 