Multi-scale physical model of shield tunnels applied in shaking table test

Bao, Zhenqiang; Yuan, Yong; Yu, Haitao

doi:10.1016/j.soildyn.2017.06.021

Cited by 73 publications

(19 citation statements)

References 17 publications

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“…e elastic modulus similarity ratio is 45 (considering the severe similarity matching). e similarity ratio of other related physical quantities can be obtained according to the similarity theory (see Table 2) [19,20].…”

Section: Similarity Ratiomentioning

confidence: 99%

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

Cui

Wang

et al. 2020

Advances in Materials Science and Engineering

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In order to improve the structural safety and stability of the tunnels crossing stick-slip fault, an indoor model test on the effect of tunnel antibreaking measures under the influence of fault stick-slip movements was conducted. Using contact pressure, longitudinal strain, and safety factor, the antibreaking effect of tunnels was compared and analyzed under 5 kinds of operating conditions, mainly including no measures, structural strengthening, structural strengthening and reducing dislocation layer, structural strengthening and reducing dislocation joint, structural strengthening and reducing dislocation layer, and reducing dislocation joint. The results showed that the longitudinal strain and contact pressure of the tunnel changed markedly (from severe change to more uniform change) when the reducing dislocation measures were adopted in the test, reducing dislocation layer/joint or reducing dislocation layer and reducing dislocation joint. The effect of reducing the fault stick-slip dislocation on the tunnel structure is very limited by only taking structure strengthening measures. The effect of reducing the fault stick-slip dislocation on the tunnel structure is obvious by using the reducing dislocation method, and the minimum safety factor is increased by more than 8 times. The effect of resisting and reducing the fault stick-slip dislocation on the tunnel structure is remarkable by adopting the measures of the structural strengthening and reducing dislocation layer and reducing dislocation joint, and the minimum safety factor is increased by more than 25.45 times. The results can provide reference for the design of antibreaking for the stick-slip fault tunnel in high earthquake intensity and dangerous mountainous areas.

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Section: Similarity Ratiomentioning

confidence: 99%

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

Cui

Wang

et al. 2020

Advances in Materials Science and Engineering

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“…To satisfy the aforementioned similitude relations, an artificial model soil made of sand mixed with sawdust was selected, which had been studied and used by other researchers [29]. By targeting the curves of both the shear modulus and damping ratio decaying with the shear strain for the artificial model soil and prototype soil [30], the optimum mass ratio of sawdust to sand was determined to be 1:2.5 through a series of cyclic triaxial tests performed in the laboratory. The comparison of the curves between artificial model soil and prototype soil can be found in [24].…”

Section: Modelmentioning

confidence: 99%

Experimental Assessment of the Effect of Vertical Earthquake Motion on Underground Metro Station

et al. 2019

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This paper presents experimental assessment of the effect of the ratio of vertical to horizontal peak ground acceleration (RVH) on underground metro station. An atrium-style metro station embedded in artificial soil subjected to earthquake loading is examined through shaking table tests. The experimental results for three different RVH, including soil acceleration, soil-structure acceleration difference, dynamic soil normal stress (DSNS), and structural dynamic strain, are presented and the results are compared with the case of horizontal-only excitation. It is found that for an atrium-style metro station, the differences in horizontal acceleration amplitude between the structure and the adjacent soil rise with increasing RVH, which are different at different depths. The most significant differences occur at the depth of the ceiling slab. It is also observed that both the amplitude and distribution of peak DSNS have obvious differences between the left and right side walls at all levels. It is therefore concluded that the RVH has a significant influence on dynamic soil-structure interaction. It is believed that under extreme earthquake loading, such as near fault zones, RVH is a parameter of paramount importance and should be accounted for in the seismic analyses and seismic performance assessments of underground structures, especially for those with zero or near-zero buried depth, such as atrium-style metro stations.

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“…The seismic design and analysis of tunnels has been investigated for many decades . Many researchers have explored the seismic response of tunnels under body waves through various methods, such as model tests, numerical simulations, and analytical methods . However, it is acknowledged that the safety of shallow tunnels far from the epicenter of an earthquake is mainly compromised by Rayleigh waves .…”

Section: Introductionmentioning

confidence: 99%

Analytical solution for longitudinal seismic response of long tunnels subjected to Rayleigh waves

Yang

Yuan

et al. 2020

Num Anal Meth Geomechanics

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The longitudinal seismic response of a long tunnel subjected to Rayleigh waves is investigated in this paper. The tunnel is assumed to be infinitely long, has a uniform cross section, and rests on a viscoelastic foundation. The free-field deformation under Rayleigh waves traveling parallel to the tunnel axis is decomposed into two directions, namely, the axial motion and the vertical motion, and transformed into dynamic loads imposed on the tunnel. Based on the Fourier and Laplace integral transform techniques, the governing equations of tunnels are simplified into algebraic equations, and the analytical solutions are obtained with the convolution theorem. The final solutions of the tunnel responses in terms of deflection, velocity, acceleration, axial force, bending moment, and shear force are investigated. The proposed solution is verified by comparison of its results and those from the finite element program ABAQUS. Further parametric analysis is carried out to investigate the influence of soil-structure relative stiffness ratio and wave frequency on dynamic longitudinal responses of the tunnel. K E Y W O R D S analytical solution, integral transform, long tunnel, Rayleigh waves

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Multi-scale physical model of shield tunnels applied in shaking table test

Cited by 73 publications

References 17 publications

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

Experimental Assessment of the Effect of Vertical Earthquake Motion on Underground Metro Station

Analytical solution for longitudinal seismic response of long tunnels subjected to Rayleigh waves

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