Dynamic centrifuge tests on effects of isolation layer and cross-section dimensions on shield tunnels

Chen, Zhiyi; Liang, Sunbin; Shen, Hao; He, Chuan

doi:10.1016/j.soildyn.2018.03.002

Cited by 58 publications

(14 citation statements)

References 8 publications

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“…A large number of studies were conducted to investigate the seismic effect of the FRC and the shock isolation performance of the buffer layer in tunnel engineering. Chen et al (2018) conducted the centrifuge tests on the buffer layer of a square tunnel, and the relation between the seismic wave frequency and the shock absorption ability of the buffer layer was obtained. He et al (2016) tested the seismic performance of the tunnel with the polystyrene foam plastic material using the Finite Element Method (FEM), and the results showed that the foam could remarkably reduce the stresses and the plastic zones.…”

Section: Introductionmentioning

confidence: 99%

Combination of lining strengthening and buffer layers for soft and hard rock tunnels junction subjected to seismic waves

Cui

2021

Geomatics, Natural Hazards and Risk

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Tunnels in the junction of the soft and hard rock always suffer severe damages during the strong earthquakes. This article aims to investigate the seismic effect of the combination of the buffer layer and the steel fibre reinforced concrete (SFRC) linings in tunnel seismic design. Firstly, taking the soft and hard rock junction of Fanjiazhai Tunnel as the research background, the finite difference calculation models considering the modified seismic motion, the mechanical damping, the safety factor and the seismic materials are established to study the seismic response of the tunnel crossing the soft and hard rock junction. Then, the buffer layer and the SFRC lining are applied into the soft-hard rock junction tunnel respectively, the isolation performance of the buffer layer and the strengthening effect of the SFRC lining are analyzed by using the seismic displacement, seismic acceleration and the safety factor. Finally, the combination of the buffer layer and the SFRC lining is employed in the tunnel located in soft-hard rock junction, the effectiveness and the synergistic effect of combination method are proved by numerical analysis. The research results can provide references for seismic fortification of the tunnel crossing soft and hard surrounding rock junction in meizoseismal area.

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Section: Introductionmentioning

confidence: 99%

Combination of lining strengthening and buffer layers for soft and hard rock tunnels junction subjected to seismic waves

Cui

2021

Geomatics, Natural Hazards and Risk

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“…The seismic response mitigation and seismic protection of structures have been discussed in recent decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. For tunnels, coating with soft seismic isolation materials has been studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

“…They pointed out that when a geo-foam isolation layer was utilized, the earth pressure decreased to 10%-30% of that without a seismic isolation layer [10]. Chen et al (2018) conducted two dynamic centrifuge tests to demonstrate the isolation effectiveness of rubber under seismic loads. The test results showed that the rubber isolation layer effectively decreased dynamic bending moments for tunnels with various diameters [11].…”

Section: Introductionmentioning

confidence: 99%

“…Chen et al (2018) conducted two dynamic centrifuge tests to demonstrate the isolation effectiveness of rubber under seismic loads. The test results showed that the rubber isolation layer effectively decreased dynamic bending moments for tunnels with various diameters [11]. According to the numerical results of Roy et al (2019), a significant reduction of axial forces and bending moments of the lining was observed when Expanded Polystyrene Geo-foam was utilized to coat the lining [12].…”

Section: Introductionmentioning

confidence: 99%

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Seismic Isolation Effect of Non-Water Reacted Two-Component Polymeric Material Coating on Tunnels

Wang

Guo

et al. 2020

Applied Sciences

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An isolation layer is one of the countermeasures to promote the anti-seismic performance of tunnels. A newly invented polymeric material, non-water reacted two-component polymeric material (NRTCPM), is superior in impermeability and construction efficiency. In this study, covering a tunnel with NRTCPM coating to mitigate the damage caused by an earthquake is discussed, and an Impact Resonance Test (IRT) is firstly used to obtain the damping ratios and dynamic elastic modulus of NRTCPM. By using infinite element boundary, eight dynamic numerical modelsare made to study the isolation effects based on different density, Poisson’s ratio, dynamic elastic modulus and thickness of isolation layer values. Three different conditions are explored in this paper, namely (1) no NRTCPM layer coating around tunnel; (2) different densities, Poisson’s ratios and dynamic elastic moduli of a polymeric layer; and (3) various thicknesses of polymeric isolation layers around the lining. Tensile and compressive stresses are compared under these different conditions. The results show that retrofitting tunnel lining with this material has a good effect on seismic isolation. An optimum density and thickness of the NRTCPM layer is suggested considering cost and strength.

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“…The isolation mechanism of shock absorption layer is that it absorbs the soil deformation under seismic loading. Further, Chen et al [17] studied the transverse section dimension effect on the tunnel dynamic response. It showed that the bending moment responses increases with the rise of transverse section dimension.…”

Section: Introductionmentioning

confidence: 99%

Damping effects of different shock absorbing materials for tunnel under seismic loadings

Huang¹,

Wang²,

Zhou³

et al. 2019

J. vibroeng.

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Circular tunnels are widely used in infrastructure. Under the action of earthquakes, the destruction of circular tunnels will result in a large number of economic losses and casualties. Therefore, the study on shock absorption of tunnels is important. However, the research has not been sufficient on the effect of the damping layer on seismic response of a circular tunnel in sand. In this paper, the influence of the damping layer on the seismic response characteristics of circular tunnels in sand is studied by large-scale shaking table test. The actual El-centro wave is loaded to the model system in three directions during the tests. The input peak seismic acceleration values are 0.05 g, 0.1 g and 0.2 g. Then the effects of two different damping materials on the dynamic response characteristics of circular tunnels are analysed quantitatively. The test results show that the damping layer reduces the seismic response of the circular tunnel. The response accelerations of the tunnel bottom and crown without damping layer are greater than that with the damping layer, which indicates that damping layer absorbs the energy caused by the seismic motion. When the sponge rubber is used, the circular tunnel dynamic response is more attenuated than that with foam board. In conclusion, the shock absorbing layer can effectively reduce the seismic response of tunnel. As a result, the damage of the tunnel decreases under the earthquake. This study has clarified the isolation mechanism of the shock absorbing materials. It is recommended to use sponge rubber material as the shock absorbing layer.

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Dynamic centrifuge tests on effects of isolation layer and cross-section dimensions on shield tunnels

Cited by 58 publications

References 8 publications

Combination of lining strengthening and buffer layers for soft and hard rock tunnels junction subjected to seismic waves

Combination of lining strengthening and buffer layers for soft and hard rock tunnels junction subjected to seismic waves

Seismic Isolation Effect of Non-Water Reacted Two-Component Polymeric Material Coating on Tunnels

Damping effects of different shock absorbing materials for tunnel under seismic loadings

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