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Research on Transverse Seismic Resistance of Compound System of Segments and Internal Structure of a Super-large Diameter Double-layer Highway Shield Tunnel
(1. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063; 2. Hubei Provincial Engineering Laboratory for Underwater Tunnel Technology, Wuhan 430063; 3. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education,Southwest Jiaotong University, Chengdu 610031)
Abstract To study the influence of the internal structure of a double-layer highway shield tunnel on the transverse seismic resistance of the tunnel, the three-dimensional refined finite element models of the double-layer highway shield tunnels with and without an upper layer plate applied are established based on a super-large diameter doublelayer highway tunnel project. The implicit dynamic time history method is used to study the transverse seismic resistance of the compound system of segments and internal structure of the shield tunnel. The results show that: (1) the internal structure of a double-layer highway tunnel can increase the transverse stiffness of the tunnel, reduce tunnel deformation, and the internal structure with the upper layer plate applied can cause a more significant increase in transverse stiffness; (2) The internal structure can reduce the local peak bending moment and the peak axial force of the tunnel, with the axial force reduced by 732.16 kN (max.) at the arch foot and with the bending moment reduced by 723.59 kN·m (max.) at the spandrel, arch foot and hance; (3) When the upper layer plate is applied in the internal structure, the damage to the segment decreases slightly, while the damage to the internal structure increases. When the upper layer plate is not applied, new damage appears on the outer side of the segment at the hance. Considering that the internal structure is not the main load-bearing structure, the post-earthquake repairability of the tunnel with the upper layer plate is better than that of the tunnel without the upper layer plate; (4) The application of the upper layer plate in the internal structure is superior to the internal structure without the upper layer plate in reducing deformation, stress and internal force of the tunnel. However, the damage to the internal structure increases after the application of the upper layer plate. It is recommended to take corresponding strengthening measures.
Abstract：
To study the influence of the internal structure of a double-layer highway shield tunnel on the transverse seismic resistance of the tunnel, the three-dimensional refined finite element models of the double-layer highway shield tunnels with and without an upper layer plate applied are established based on a super-large diameter doublelayer highway tunnel project. The implicit dynamic time history method is used to study the transverse seismic resistance of the compound system of segments and internal structure of the shield tunnel. The results show that: (1) the internal structure of a double-layer highway tunnel can increase the transverse stiffness of the tunnel, reduce tunnel deformation, and the internal structure with the upper layer plate applied can cause a more significant increase in transverse stiffness; (2) The internal structure can reduce the local peak bending moment and the peak axial force of the tunnel, with the axial force reduced by 732.16 kN (max.) at the arch foot and with the bending moment reduced by 723.59 kN·m (max.) at the spandrel, arch foot and hance; (3) When the upper layer plate is applied in the internal structure, the damage to the segment decreases slightly, while the damage to the internal structure increases. When the upper layer plate is not applied, new damage appears on the outer side of the segment at the hance. Considering that the internal structure is not the main load-bearing structure, the post-earthquake repairability of the tunnel with the upper layer plate is better than that of the tunnel without the upper layer plate; (4) The application of the upper layer plate in the internal structure is superior to the internal structure without the upper layer plate in reducing deformation, stress and internal force of the tunnel. However, the damage to the internal structure increases after the application of the upper layer plate. It is recommended to take corresponding strengthening measures.
XUE Guangqiao1,
2 XIAO Mingqing1,
2 FENG Kun3 WANG Shaofeng1 etc
.Research on Transverse Seismic Resistance of Compound System of Segments and Internal Structure of a Super-large Diameter Double-layer Highway Shield Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(5): 67-77
2023, Vol. 60 