Abstract
Tunnel excavation in squeezing ground exhibits large time-dependent and often anisotropic deformation. Within the context of the Fréjus road tunnel and its safety gallery excavated under the Alps between France and Italy, an interesting configuration of two parallel tunnels under squeezing ground conditions is observed. The special feature of this case study lies in the fact that both tunnels have been excavated in similar geotechnical conditions but with different excavation techniques. The road tunnel was excavated with conventional drill and blast methods in the 70s, whereas the safety gallery was excavated between 2009 and 2016 with a single-shield tunnel boring machine (TBM). This paper presents monitoring data processing and numerical simulations of both tunnels with the aim of studying the influence of the excavation method on the time-dependent tunnel response. A calibration of a visco-elasto-plastic anisotropic constitutive model based on the back-analysis of convergence measurements retrieved during the excavation of the Fréjus road tunnel is carried out. The identified ground behavior can be extrapolated to the parallel zones of the safety gallery. In particular, we are interested in the prediction of the stress state in the segmental lining of the gallery during its excavation and the comparison with in situ measurements. It is shown that the time-dependent behavior of the ground is affected by the excavation technique. Finally, an attempt to predict the long-term response of both tunnels is proposed.
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Abbreviations
- \(C_{\infty x}\) :
-
Instantaneous convergence obtained in the case of an infinite rate of face advance (no time-dependent effect)
- X :
-
Parameter related to the distance of influence of the tunnel face
- T :
-
Parameter related to time-dependent behavior of the system (rock mass formation support)
- m :
-
Parameter which represents the relationship between the long-term total convergence and the instantaneous convergence
- n :
-
Form factor of the fitting law which is often taken equal to 0.3
- β :
-
Anisotropy ratio of the convergence data
- ξ :
-
Variability index of the convergence data
- \(E\) :
-
Young’s modulus of the solid matrix
- v :
-
Poisson’s ratio of the solid matrix
- \(K\) :
-
Elastic bulk modulus of the solid matrix
- \(G_{\text{K}}\) :
-
Kelvin shear modulus of the solid matrix
- \(\eta_{\text{K}}\) :
-
Kelvin dynamic viscosity of the solid matrix
- \(G_{\text{M}}\) :
-
Elastic shear modulus of the solid matrix
- \(\eta_{\text{M}}\) :
-
Maxwell dynamic viscosity of the solid matrix
- c :
-
Cohesion of the solid matrix
- ϕ :
-
Friction angle of the solid matrix
- \(\psi\) :
-
Dilation angle of the solid matrix
- \(\sigma_{t}\) :
-
Tension limit of the solid matrix
- \(c_{j}\) :
-
Cohesion of the weak planes
- \(_{j}\) :
-
Friction angle of the weak planes
- \(\psi_{j}\) :
-
Dilation angle of the weak planes
- \(\sigma_{tj}\) :
-
Tension limit of the weak planes
- α :
-
Variability index of the constitutive parameters (describing the damage degree of the rock mass)
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Acknowledgements
This work is part of the PhD thesis of the first author, carried out at Ecole des Ponts ParisTech in partnership with TRACTEBEL ENGIE and CETU (French centre for tunnels studies). The authors wish to thank the SFTRF (Société Française du Tunnel Routier du Fréjus) for providing monitoring data on both tunnels and ITASCA for supporting the first author through the Itasca Education Partnership Program (IEPP).
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de la Fuente, M., Sulem, J., Taherzadeh, R. et al. Tunneling in Squeezing Ground: Effect of the Excavation Method. Rock Mech Rock Eng 53, 601–623 (2020). https://doi.org/10.1007/s00603-019-01931-4
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DOI: https://doi.org/10.1007/s00603-019-01931-4