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A platform for research: civil engineering, architecture and urbanism
Seismic damage characteristics of large-diameter shield tunnel lining under extreme-intensity earthquake
https://orcid.org/0000-0003-4166-2150
https://orcid.org/0000-0001-8087-7926
Abstract This paper investigates the damage pattern of the concrete lining in a large-diameter subsea shield tunnel under different seismic loading intensities. Based on the Shantou Bay (STB) Tunnel, a refined finite element (FE) model consisting of “1/2 + 1+1/2” liner-rings is established in the study. In addition, another FE model considering both the strata and lining is created to obtain the seismic displacement-time history, which is employed as the boundary conditions on the “1/2 + 1+1/2” liner-rings model. A whole-ring model is thereafter generated considering the segment details, adopting the Concrete Damage Plastic (CDP) constitutive assumption and artificial viscoelastic boundary. An improved reaction-displacement method based on the concept of the “equivalent layer” is proposed to consider stratum-structure interaction. Finally, two types of seismic intensities and three work conditions are employed to investigate the influence on lining segments and joint openings. The results show that: (i) the damage to the segment of the shield tunnel is mainly concentrated in the top and bottom of the arch and the outer area of the waist under seismic loading; (ii) the moment of a sudden change in the damage development trend and the joint opening is related to the peak response of seismic time history; (iii) the segments of the shield tunnel are dominated by vertical oval shape deformation under a horizontal earthquake, and dominated by horizontal oval shape deformation under a vertical earthquake; (iv) the area and level of lining damage increase with the development of the earthquake intensity.
Highlights The damage pattern of a large-diameter subsea shield-tunnel under different seismic intensities is investigated. A series of refined FE models are established in the study considering the segmentation and assembly of the tunnel lining. An improved reaction-displacement method based on the concept of the “equivalent layer” is proposed.
Seismic damage characteristics of large-diameter shield tunnel lining under extreme-intensity earthquake
https://orcid.org/0000-0003-4166-2150
https://orcid.org/0000-0001-8087-7926
Abstract This paper investigates the damage pattern of the concrete lining in a large-diameter subsea shield tunnel under different seismic loading intensities. Based on the Shantou Bay (STB) Tunnel, a refined finite element (FE) model consisting of “1/2 + 1+1/2” liner-rings is established in the study. In addition, another FE model considering both the strata and lining is created to obtain the seismic displacement-time history, which is employed as the boundary conditions on the “1/2 + 1+1/2” liner-rings model. A whole-ring model is thereafter generated considering the segment details, adopting the Concrete Damage Plastic (CDP) constitutive assumption and artificial viscoelastic boundary. An improved reaction-displacement method based on the concept of the “equivalent layer” is proposed to consider stratum-structure interaction. Finally, two types of seismic intensities and three work conditions are employed to investigate the influence on lining segments and joint openings. The results show that: (i) the damage to the segment of the shield tunnel is mainly concentrated in the top and bottom of the arch and the outer area of the waist under seismic loading; (ii) the moment of a sudden change in the damage development trend and the joint opening is related to the peak response of seismic time history; (iii) the segments of the shield tunnel are dominated by vertical oval shape deformation under a horizontal earthquake, and dominated by horizontal oval shape deformation under a vertical earthquake; (iv) the area and level of lining damage increase with the development of the earthquake intensity.
Highlights The damage pattern of a large-diameter subsea shield-tunnel under different seismic intensities is investigated. A series of refined FE models are established in the study considering the segmentation and assembly of the tunnel lining. An improved reaction-displacement method based on the concept of the “equivalent layer” is proposed.
Seismic damage characteristics of large-diameter shield tunnel lining under extreme-intensity earthquake
https://orcid.org/0000-0003-4166-2150
https://orcid.org/0000-0001-8087-7926
Abstract This paper investigates the damage pattern of the concrete lining in a large-diameter subsea shield tunnel under different seismic loading intensities. Based on the Shantou Bay (STB) Tunnel, a refined finite element (FE) model consisting of “1/2 + 1+1/2” liner-rings is established in the study. In addition, another FE model considering both the strata and lining is created to obtain the seismic displacement-time history, which is employed as the boundary conditions on the “1/2 + 1+1/2” liner-rings model. A whole-ring model is thereafter generated considering the segment details, adopting the Concrete Damage Plastic (CDP) constitutive assumption and artificial viscoelastic boundary. An improved reaction-displacement method based on the concept of the “equivalent layer” is proposed to consider stratum-structure interaction. Finally, two types of seismic intensities and three work conditions are employed to investigate the influence on lining segments and joint openings. The results show that: (i) the damage to the segment of the shield tunnel is mainly concentrated in the top and bottom of the arch and the outer area of the waist under seismic loading; (ii) the moment of a sudden change in the damage development trend and the joint opening is related to the peak response of seismic time history; (iii) the segments of the shield tunnel are dominated by vertical oval shape deformation under a horizontal earthquake, and dominated by horizontal oval shape deformation under a vertical earthquake; (iv) the area and level of lining damage increase with the development of the earthquake intensity.
Highlights The damage pattern of a large-diameter subsea shield-tunnel under different seismic intensities is investigated. A series of refined FE models are established in the study considering the segmentation and assembly of the tunnel lining. An improved reaction-displacement method based on the concept of the “equivalent layer” is proposed.
Seismic damage characteristics of large-diameter shield tunnel lining under extreme-intensity earthquake
Zhao, Zhenyun (author) / Cui, Jie (author) / Liu, Chao (author) / Liu, Hai (author) / Rehman, Mujeeb ur (author) / Chen, Weiyun (author) / Peng, Zhuohua (author)
2023-04-07
Article (Journal)
Electronic Resource
English
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