Seismic response of shallow circular tunnels in two-layered ground

Gomes, Rui Telmo; Gouveia, Fátima; Torcato, Diogo; Santos, Jaime

doi:10.1016/j.soildyn.2015.03.012

Cited by 37 publications

(12 citation statements)

References 10 publications

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“…Several studies have been performed on seismic analysis for tunnels in stratified soil. Previously under transverse S-waves was assuming no-slip interface condition [2], [3]. These studies highlighted the importance of the soil stratification effect on the tunnel design.…”

Section: Introductionmentioning

confidence: 99%

“…These studies highlighted the importance of the soil stratification effect on the tunnel design. It was found that tunnel lining forces increased up to 5 times when the layers interface crossing the tunnel lining at the invert level when the upper layer was stiffer than the lower layer by 20 times [3]. Hong Wang [2] mentioned that the seismic analysis of tunnels embedded in stratified soil with different soil-lining interface conditions or real interface condition should be investigated.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Seismic P-Waves Propagation on Circular Tunnels in Layered Ground

Ibrahim¹,

Ramadan²,

Akl³

2019

IJEAT

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During propagation of the compression seismic P-waves, the tunnels are subjected to ovaling deformations. In cases where the soil stiffness is varying along the tunnel cross-section, tunnel lining may take sharper deformed shapes and subjected to magnified bending moments and thrust forces. This paper investigates the effect of the soil stratification on the seismic behavior of circular tunnels under P-waves loading. A 2D finite element models with time history earthquake (EQ) analysis were performed accounting for different tunnel/soil interface slippage conditions. The finite element analysis results were compared with recent analytical solution for calculating the seismic forces of the tunnel lining. The study proved that soil stratification has a great effect on the tunnel seismic forces and it should be considered in the analysis and design. Illustrative curves were presented in this paper to give approximate magnification factors for the anticipated forces. It should be used as a guide in the preliminary design stage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Seismic P-Waves Propagation on Circular Tunnels in Layered Ground

Ibrahim¹,

Ramadan²,

Akl³

2019

IJEAT

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“…The 1995 Kobe earthquake caused a major collapse of the Daikai subway station in Kobe, which represents the first modern underground structure failure during a seismic event. The seismic design and analysis methods of underground structures have been rapidly developed since then [1][2][3][4][5][6][7][8]. Hashash et al [2] described approaches used by engineers in quantifying the seismic effects on an underground structure.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic Boundary Conditions for Multiple Excitation Sources in the Time Domain

Chen

2018

Mathematical Problems in Engineering

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Transmitting boundaries are important for modeling the wave propagation in the finite element analysis of dynamic foundation problems. In this study, viscoelastic boundaries for multiple seismic waves or excitations sources were derived for two-dimensional and three-dimensional conditions in the time domain, which were proved to be solid by finite element models. Then, the method for equivalent forces’ input of seismic waves was also described when the proposed artificial boundaries were applied. Comparisons between numerical calculations and analytical results validate this seismic excitation input method. The seismic response of subway station under different seismic loads input methods indicates that asymmetric input seismic loads would cause different deformations from the symmetric input seismic loads, and whether it would increase or decrease the seismic response depends on the parameters of the specific structure and surrounding soil.

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“…Based on the obtained results, they declared that the seismic analysis was only necessary for areas with seismic acceleration more than 0.15 g [12]. Gomes et al studied the seismic behavior of shallow circular tunnels in two-layered ground [13]. In another research, Pitilakis et al interaction effects, focusing on the tunnel response.…”

Section: Introductionmentioning

confidence: 99%

“…Then, soil-structure interaction is considered at springs. Gomes et al [13] conducted a comprehensive study in the field of comparing the finite element analysis details with simple models for seismic analysis of tunnels and found that except for a few exceptions, simplified procedures will lead to conservative results. One reason for this is that, the effects of soil-structure interaction cannot be determined with the simplified procedures.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Seismic Behavior of Two Non-coplanar Tunnels

Pourzahedi¹,

Aghayan²

2017

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Abstract. With regard to increase in growth of population in metropolitan areas around the world, the development of urban infrastructures in a way that is responsive to the population has become a major concern. Today, many cities are willing to use rail transport system which this requires conducting detailed studies of engineers in the field of traffic engineering for the optimal locating in rail lines. Hence in the field of structural and geotechnical engineering for detailed design and structure analysis of tunnels due to applied loads on it and their behavior against the vibrations generated by train movement or earthquake. Then, in order to achieve more realistic results, the urgent need to use three-dimensional analyses and non-linear models can be seen. In the present study, threedimensional analysis of vibrations caused by simultaneous passing of two trains over each other in two tunnels with different directions, three-dimensional analysis of land subsidence caused by excavation of two passing tunnels and three-dimensional seismic analysis of two passing tunnels were discussed with the help of non-linear dynamic modeling. The results of this research showed although the soil at the bottom of the upper tunnel was on the verge of shear failure; however, the relative displacement of tunnels to each other was less than 10 mm. Moreover, the geometry section deformation of tunnels was around 0.8 mm which was negligible values. Thus, the studied tunnels had considerable stability.

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Seismic response of shallow circular tunnels in two-layered ground

Cited by 37 publications

References 10 publications

Effect of Seismic P-Waves Propagation on Circular Tunnels in Layered Ground

Effect of Seismic P-Waves Propagation on Circular Tunnels in Layered Ground

Viscoelastic Boundary Conditions for Multiple Excitation Sources in the Time Domain

An Analysis of Seismic Behavior of Two Non-coplanar Tunnels

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