Effect of twin-parallel tunnels on seismic ground response due to vertically in-plane waves

Alielahi, Hamid; Adampira, Mohammad

doi:10.1016/j.ijrmms.2016.03.010

Cited by 38 publications

(12 citation statements)

References 42 publications

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“…In the design stages of the subways maybe the type of tunnel as a single or twin tunnel is the most important parameter. In the past, most of the tunnels were excavated in a single tunnel type [41], but nowadays there are a lot of metro lines excavated as twins for different purposes [15,42,43]. A lot of studies have investigated the modeling of the tunnel excavating by TBM, but 3D simulation on the comparison of the soil movements caused by single and twin tunnels is inevitable before implementation.…”

Section: Introductionmentioning

confidence: 99%

3D FEM Model on the Parameters’ Influence of EPB-TBM on Settlements of Single and Twin Metro Tunnels During Construction

Forsat

Taghipoor

Palassi

2021

Int. J. Pavement Res. Technol.

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The present research exposes the investigation on three-dimensional modeling of the single and twin metro tunnels for the case of the Tehran metro line. At first, simulation implemented on the comparison of the ground movements in the single and twin tunnels. Then the simulation has been performed on the influence of effective parameters of EPB-TBM on the surface settlements throughout excavation. The overcutting, shield conicity, grouting, and the final lining system modeled and the influence of face supporting pressure, grout injection pressure, as well as the clear distance of the tunnels, has been analyzed. The initial results showed a valid ground settlement behavior. The maximum settlements occurred at the end of the shield tail and it was higher in the single tunnel. The face supporting pressure had more effect on the surface settlement in comparison to the grout injection pressure. By increasing the face pressure in the single tunnel, the place of maximum settlement moved back while the grout pressure is insignificant for decreasing the settlements. Furthermore, the influence of the clear distance in the twin tunnels led to zero after the length of 30 m. Accordingly, for more distances, the tunnels must be examined independently and as two different single tunnels.

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Section: Introductionmentioning

confidence: 99%

3D FEM Model on the Parameters’ Influence of EPB-TBM on Settlements of Single and Twin Metro Tunnels During Construction

Forsat

Taghipoor

Palassi

2021

Int. J. Pavement Res. Technol.

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“…A large number of theoretical research and earthquake damage investigations [1][2][3][4][5] have illustrated that the mountain/hill topography has a significant effect on the seismic surface motions, and, due to the scattering and interference of seismic waves inside the mountain, there exists a strong interaction between the tunnel and the mountain, which is of great importance for the seismic design of mountain tunnels. e existence of mountain or tunnel will significantly change the spatial distribution characteristics of ground motion and affect the damage degree and the distribution of local ground motions [6][7][8][9][10][11][12][13][14][15]. At present, the seismic response analysis methods commonly used can be divided into the analytical methods and the numerical methods.…”

Section: Introductionmentioning

confidence: 99%

IBEM Simulation of Seismic Wave Scattering by a 3D Tunnel Mountain

Jiang

Hua

Jiang

et al. 2021

Shock and Vibration

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The seismic wave scattering by a 3D tunnel mountain is investigated by the indirect boundary element method (IBEM). Without loss of generality, the 3D physical model of hemispherical tunnel mountain in an elastic half-space is established, and the influence of the incidence frequency and angle of P or SV wave on the mountain surface displacements is mainly examined. It is shown that there exists quite a difference between the spatial distribution of displacement amplitude under the incident P wave and the one under SV wave and that the incidence frequency and angle of wave, especially the existence of tunnel excavated in the mountain, have a great effect on the surface displacements of mountain; the presence of the tunnel in the mountain may cause the greater amplification of surface displacement, which is unfavorable to the mountain projects. In addition, it should be noted that the tunnel may suffer the more severe damage under the incident SV wave.

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“…The importance and cost of the underground RC structures require an accurate analysis of the seismic behavior of structural systems, including the ground environment. Although several studies have investigated the seismic performance of tunnels [5][6][7][8][9], little research has been conducted in northern Africa and Morocco.…”

Section: Introductionmentioning

confidence: 99%

Seismic analysis of the zaouiat ait mellal twin tunnels of Agadir motorway (Morocco)

et al. 2020

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Underground structures, such as tunnels, are vital for ensuring all kinds of transportation; and being buried under the surface makes them exposed to soil dynamics. Added to the moderate seismic activity in Morocco, the stability of tunnels is put to the test. This paper examines the interaction between the ZAM (Zaouit Ait Mellal) twin tunnels between the cities of Marrakesh and Agadir, using the Difference Element Method provided by FLAC 2D software. The acceleration is introduced as the one related to the historic event of El centro 1940 with free-field boundary conditions in the numerical model, with three configurations: tunnel 1 without tunnel 2, tunnel 2 without tunnel 1 and tunnel 1 with tunnel 2. The results of the simulations indicate that the differences values of the maximum displacement, axial force and bending moment on structural elements are very noteworthy from the configuration of the tunnel (single) to the twin tunnels in order to prove the interaction between these latter under seismic loading.

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Effect of twin-parallel tunnels on seismic ground response due to vertically in-plane waves

Cited by 38 publications

References 42 publications

3D FEM Model on the Parameters’ Influence of EPB-TBM on Settlements of Single and Twin Metro Tunnels During Construction

3D FEM Model on the Parameters’ Influence of EPB-TBM on Settlements of Single and Twin Metro Tunnels During Construction

IBEM Simulation of Seismic Wave Scattering by a 3D Tunnel Mountain

Seismic analysis of the zaouiat ait mellal twin tunnels of Agadir motorway (Morocco)

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