Seismic response of ultra-large diameter shield tunnel in upper-soft and lower-hard site: Shaking table tests and numerical simulations

Liang, Jianwen; Xu, Anquan; Ba, Zhenning; Wu, Zequn; Yan, Qichao; Zhu, Yao

doi:10.1016/j.soildyn.2022.107634

Cited by 13 publications

(4 citation statements)

References 43 publications

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“…Consequently, the vertical load can be obtained from Equations ( 3) and ( 4). The loading continues until the horizontal force reaches 600 kN, after which the horizontal force is increased by 25 kN at each stage [12]. During the loading process, the bolt moment is calculated based on an eccentricity (M/N) of 0.3 m, with horizontal force N incrementally loaded by 50 kN at each stage.…”

Section: Validation Of Joints Modelmentioning

confidence: 99%

Section: Validation Of Joints Modelmentioning

confidence: 99%

“…In addition, researchers have also conducted relevant studies using shake table tests. Liang et al [12] designed shake table tests to study the characteristics of seismic wave propagation in different strata and discovered a turning point in the seismic wave amplification factor. Given the substantial size of actual shield tunnel segments and their complex joints, it is challenging to simulate experiments for long-distance shield tunnels.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Seismic Response of Shield Tunnel Structures with the Preload Loss of Bolts

Cui,

Tao,

Shen

et al. 2023

Applied Sciences

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Shield tunnels can experience preload loss in their connecting bolts during the operational phase, leading to changes in tunnel structure stiffness, which, in turn, affect the seismic performance of shield tunnels. A refined three-dimensional model of shield tunnel was established using the finite element method to study the impact of preload loss in connecting bolts on the seismic dynamic response of shield tunnels. An artificial viscoelastic boundary was used to simulate the propagation of seismic waves from an infinitely distant field. This study investigated the effects of different levels of preload loss on the seismic response of shield tunnels. In addition, the Arias intensity, which can reflect the degree of seismic impact on structures, was used to analyse the extent of damage to the tunnel. The conclusions drawn from the study are as follows: As the level of preload loss increases, the tightness of the segments during the static phase gradually deteriorates, and the maximum joint opening during the seismic loading phase continues to increase. Post-earthquake non-recoverable ellipticity and radial deformation progressively increase with an increase to preload loss level. Overall tunnel damage becomes more significant with the degree of preload loss increases depending on the Arias intensity. Preload loss leads to a decrease in the overall structural stiffness and an increase in longitudinal relative displacement. In conclusion, preload loss also affects structural failure mode and seismic performance. These research findings are of reference value for enhancing the seismic performance of shield tunnel structures and ensuring engineering safety.

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Section: Validation Of Joints Modelmentioning

confidence: 99%

Section: Validation Of Joints Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on the Seismic Response of Shield Tunnel Structures with the Preload Loss of Bolts

Cui,

Tao,

Shen

et al. 2023

Applied Sciences

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“…The similarity ratio design method expands material selection possibilities for structural models and broadens the applicability of shakers with conventional loading properties [6]. By integrating numerical simulations of upper soft and lower hard fields, as well as pure soft and hard fields, the study unveils differences in tunnel seismic responses between upper soft and lower hard fields, and pure soft and hard fields [7]. Li et al [8] divided the soil and rock fields into four areas with different conditions and studied the influence of tunnels on the surface acceleration response of soil-rock formation using a shaking table test.…”

Section: Introductionmentioning

confidence: 99%

Shaking Table Test and Dynamic Response Analysis of Saturated Soil–Submarine Tunnel

Gu,

Chen,

Bao

et al. 2024

Buildings

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With the increasing construction of undersea tunnels in seismic-prone areas, accurately assessing their response to seismic conditions is crucial. To grasp the dynamic response of undersea tunnel structures to seismic waves, the shaking table test of water–sea–sea submarine tunnel is designed and carried out based on the methods of orthogonal design and fuzzy method. A comprehensive time-domain model is developed to capture the nonlinear dynamic interaction of ocean engineering structures, taking into account seismic waves, seawater, and saturated soil. The research results show that as the burial depth at each measurement point of the submarine tunnel increases, the acceleration response decreases and the horizontal displacement relative to the seabed surface increases. Comparing test and finite element simulation results reveals that under seismic loading, the strain distribution pattern of the tunnel section is mainly in the arch shoulder, waist, and foot with larger strain peaks, whereas the strain peaks at the arch top and the superelevation arch are smaller. Simultaneously, doubling the water pressure induces a slight increase in the overall strain response peak of the tunnel, with an indistinct relative displacement change rule. When a vertically polarized shear wave (SV wave) is vertically incident, different dynamic response indices will have different trends with the change in water level. This study may provide a reference for shaking table tests for saturated soil–submarine tunnels at complex sites.

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Seismic Response Mechanism of Near Fault Tunnel: Theoretical Analysis and Shaking Table Test

Zhu,

Dai

et al. 2024

KSCE J Civ Eng

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Seismic response of ultra-large diameter shield tunnel in upper-soft and lower-hard site: Shaking table tests and numerical simulations

Cited by 13 publications

References 43 publications

Study on the Seismic Response of Shield Tunnel Structures with the Preload Loss of Bolts

Study on the Seismic Response of Shield Tunnel Structures with the Preload Loss of Bolts

Shaking Table Test and Dynamic Response Analysis of Saturated Soil–Submarine Tunnel

Seismic Response Mechanism of Near Fault Tunnel: Theoretical Analysis and Shaking Table Test

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