Abstract In order to improve the safety of tunnel portal lining structure during earthquake, taking the portal section of a highway tunnel as the research background, it carries out comparative analysis with the finite element analysis software ABAQUS on the anti-seismic effects of steel fiber reinforced concrete (SFRC), steel-basalt hybrid fiber reinforced concrete (SBHFRC) and plain concrete as secondary lining structure materials. The results show that: (1)compared with plain concrete lining, under the condition of the same fiber volume content, the maximum and minimum principal stress peaks and shear stress peaks of SFRC secondary lining are increased by 34.27%, 23.56% and 23.54% respectively, while those of SBHFRC secondary lining are increased by 3.90%, 3.37% and 3.32% respectively; (2) the equivalent displacements of SFRC and SBHFRC secondary lining structures are reduced by 8.08% and 2.36% respectively; and (3) the average safety factors of monitoring points on the monitoring sections of SFRC and SBHFRC secondary lining structures are increased by 38.73% and 50.04% respectively.
Abstract：
In order to improve the safety of tunnel portal lining structure during earthquake, taking the portal section of a highway tunnel as the research background, it carries out comparative analysis with the finite element analysis software ABAQUS on the anti-seismic effects of steel fiber reinforced concrete (SFRC), steel-basalt hybrid fiber reinforced concrete (SBHFRC) and plain concrete as secondary lining structure materials. The results show that: (1)compared with plain concrete lining, under the condition of the same fiber volume content, the maximum and minimum principal stress peaks and shear stress peaks of SFRC secondary lining are increased by 34.27%, 23.56% and 23.54% respectively, while those of SBHFRC secondary lining are increased by 3.90%, 3.37% and 3.32% respectively; (2) the equivalent displacements of SFRC and SBHFRC secondary lining structures are reduced by 8.08% and 2.36% respectively; and (3) the average safety factors of monitoring points on the monitoring sections of SFRC and SBHFRC secondary lining structures are increased by 38.73% and 50.04% respectively.
CUI Guangyao1 JIANG Mengxin1 WANG Mingsheng2
.Anti-seismic Effect of Fiber-reinforced Concrete Lining at Tunnel Portals in High-intensity Seismic Areas[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(1): 207-213
2022, Vol. 59 