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Geomechanics and Engineering Volume 6, Number 3, March 2014 , pages 263-275 DOI: https://doi.org/10.12989/gae.2014.6.3.263 |
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2D numerical investigations of twin tunnel interaction |
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Ngoc Anh Do, Daniel Dias, Pierpaolo Oreste and Irini Djeran-Maigre
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| Abstract | ||
| The development of transportation in large cities requires the construction of twin tunnels located at shallow depth. As far as twin tunnels excavated in parallel are concerned, most of the cases reported in literature focused on considering the effect of the ground condition, tunnel size, depth, surface loads, the relative position between two tunnels, and construction process on the structural lining forces. However, the effect of the segment joints was not taken into account. Numerical investigation performed in this study using the FLAC3D finite difference element program made it possible to include considerable influences of the segment joints and tunnel distance on the structural lining forces induced in twin tunnels. The structural lining forces induced in the first tunnel through various phases are considerably affected by the second tunnel construction process. Their values induced in a segmental lining are always lower than those obtained in a continuous lining. However, the influence of joint distribution in the second tunnel on the structural forces induced in the first tunnel is insignificant. The critical influence distance between two tunnels is about two tunnel diameters. | ||
| Key Words | ||
| tunnel; twin tunnels; segmental lining; structural forces; segmental joint; tunnel distance; numerical model | ||
| Address | ||
| (1) Ngoc Anh Do and Irini Djeran-Maigre: Laboratory LGCIE, University of Lyon, INSA of Lyon, Villeurbanne, France; (2) Daniel Dias: Laboratory LTHE, Grenoble Alpes University, Grenoble, France; (3) Pierpaolo Oreste: Department of Environmental, Land and Infrastructural Engineering, Politecnico of Torino, Torino, Italy; (4) Ngoc Anh Do: Department of Underground and Mining Construction, Faculty of Civil Engineering, Hanoi University of Mining and Geology, Vietnam. | ||