Analysis method and design charts for bolt reinforcement of the tunnel face in cohesive-frictional soils

Anagnostou, Georg; Perazzelli, Paolo

doi:10.1016/j.tust.2014.10.007

Cited by 78 publications

(13 citation statements)

References 22 publications

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“…Tunnel excavation mainly refers to the closed-face case, like the open-face conventional tunneling or the shield tunneling (Pan et al, 2017). Conventional tunneling does not exert support pressure on tunnel face, but developing some auxiliary techniques, such as advance injection tubes, shed-pipe grouting, face bolts and umbrella arch system (Ocak et al, 2008;Aksoy et al, 2010;Maidl et al, 2013;Oke et al, 2014;Zhang et al, 2014;Anagnostou et al, 2015;Paternesi et al 2017). These techniques generally improve the face stability by limiting the excessive deformation of the surrounding stratum, or reinforcing the rock or soil mass of the tunnel face.…”

Section: Introductionmentioning

confidence: 99%

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

Chen

Wang

et al. 2019

Tunnelling and Underground Space Technology

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Introductionmentioning

confidence: 99%

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

Chen

Wang

et al. 2019

Tunnelling and Underground Space Technology

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“…The effectiveness of various face support measures in improving tunnel face stability has been studied by several researchers, such as: Lunardi & Bindi, 2000;Kamata & Mashimo, 2003;Anagnostou & Serafeimidis, 2007;Kavvadas & Prountzopoulos, 2007;Juneja et al, 2010;Dias, 2011;Anagnostou & Perazzelli, 2015;Perazzelli & Anagnostou, 2020. Despite these efforts, the design of face support measures still remains largely empirical.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Tunnel Face Sability using Forepoling or Fiberglass Nails

Georgiou

Kavvadas

Kalos

2021

Preprint

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Pre-support of tunnel excavation faces using fiberglass nails or forepoling umbrellas aims to improve face stability in cases where an unsupported excavation face will develop uncontrollably large face extrusion, leading to face instability. The paper presents the results of a large set of parametric 3D numerical analyses of tunnel face excavation by the Finite Element Code Simulia Abaqus, using various degrees of reinforcement by fiberglass nails or forepoling umbrellas. The analyses use the average face extrusion as a measure of face stability, considering that face instability is associated with large face extrusions while the safety factor against face instability can be correlated with lower face extrusions in case of pre-supported tunnel faces. The results of the analyses are normalized and a set of semi-empirical formulae and design graphs are produced to calculate the safety factor of supported tunnel faces against instability and other useful quantities in tunnel design (average face extrusion, volume loss and deconfinement coefficient) as a function of ground strength, overburden depth and amount of face reinforcement. The analyses show that tunnel face reinforcement with FG nails is much more effective and less costly in securing face stability than the use of forepoling umbrellas. It is shown that even a coarse grid of FG nails can achieve better results than very heavy forepoling, and the difference in effectiveness is more pronounced in weaker ground and or deeper tunnels.

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“…With respect to closed‐face tunnel boring machine drilling, the shield machine can provide continuous supporting pressure on the tunnel face to ensure its stability. For open‐face New Austrian Tunneling method, the face reinforcement technique with dowels and umbrella pipes has been developed to maintain a safe excavation; the supporting effect of the face reinforcement can be simulated as supporting pressure at the tunnel face . Therefore, it is of highly practical interest to study the face pressure required in tunnel engineering.…”

Section: Introductionmentioning

confidence: 99%

The effect of pore water pressure on tunnel face stability

Pan

Dias

2016

Num Anal Meth Geomechanics

143

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Summary The kinematic approach in combination with numerical simulation is used to examine the effect of pore water pressure on tunnel face stability. Pore water pressure distribution obtained by numerical calculations using FLAC3D is used to interpolate the pore water pressure on a 3D rotational collapse mechanism. Comparisons are made to check the present approach against other solutions, showing that the present approach improves the existing upper bound solutions. Results obtained indicate that critical effective face pressure increases with water table elevation. Several normalized charts are also presented for quick evaluation of tunnel face stability. At the end of the paper, the influence of anisotropic permeability on tunnel face stability is also discussed, showing that the isotropic model leads to an overestimation of the necessary tunnel face pressure for anisotropic soils. Copyright © 2016 John Wiley & Sons, Ltd.

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Analysis method and design charts for bolt reinforcement of the tunnel face in cohesive-frictional soils

Cited by 78 publications

References 22 publications

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

An upper-bound analytical model of blow-out for a shallow tunnel in sand considering the partial failure within the face

Numerical Investigation of Tunnel Face Sability using Forepoling or Fiberglass Nails

The effect of pore water pressure on tunnel face stability

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