Volumetric behaviour of subsurface ground due to tunnelling in completely drained granular soil

Zheng, Gang; Ge, Longbo; Zhang, Tianqi; Sun, Jibin; Fan, Qian; Tong, Jingbo

doi:10.1016/j.compgeo.2019.103217

Cited by 2 publications

(1 citation statement)

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“…The rapid increase rate of the population in cities and urban areas has developed the transportation methods such as subways around the world [1][2][3][4][5]. Most of the subways tunnels are excavated by the tunnel boring machine (TBM) for the direct line sections and some stations due to its safety, small disturbance area, high effective, low cost, and low excavating volume in comparison to the other methods [6,7].…”

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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