Portal de Periódicos da CAPES

Seismic damage characteristics of large-diameter shield tunnel lining under extreme-intensity earthquake

2023; Elsevier BV; Volume: 171; Linguagem: Inglês

10.1016/j.soildyn.2023.107958

1879-341X

Zhenyun Zhao, Jie Cui, Chao Liu, Hai Liu, Mujeeb ur Rehman, Weiyun Chen, Zhuohua Peng,

Grouting, Rheology, and Soil Mechanics

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.