Tunneling under squeezing conditions : Effect of the excavation method

Abstract : During the excavation of deep tunnels, squeezing ground conditions are often encountered. The squeezing behavior of the ground is characterized by large time-dependent and usually anisotropic convergences that take place at the tunnel wall. The technique of excavation has a strong influence on the tunnel response when it is excavated under squeezing conditions. This phenomenon is illustrated throughout the case study of the Fréjus road tunnel excavated with conventional drill and blast methods and of its safety gallery excavated with a single shield tunneling boring machine. They exhibit a very interesting configuration of two tunnels excavated in parallel under the same geotechnical conditions but with different excavation techniques. Monitored geotechnical data from both tunnels are analyzed and compared. Numerical simulations of both tunnels have been carried out with Flac3D. An anisotropic creep model which includes weakness planes of given orientation embedded in a visco-elasto-plastic matrix has been used for describing the behavior of the ground. A back-analysis of convergence measurements of the Fréjus road tunnel has been carried out. The behavior of the ground identified from the Fréjus road tunnel is extrapolated to predict the response of the Fréjus safety gallery in terms of the stress state in the lining. The influence of the technique of excavation on the time-dependent parameters of the ground is taken into account in the computations and its effects are discussed. It is shown that the long term ground deformation are significantly reduced with TBM excavation as compared to traditional blast and drill method.Furthermore, the convergence-confinement methods are reviewed and their applicability is discussed when they are applied to full face circular tunnels excavated in rock masses with a stiff support system near the face. In this context, a set of empirical formula are proposed which allows to accurately predict the equilibrium state between the ground and the lining in circular tunnels excavated in full section. These formula are useful in the preliminary phase of tunnel design
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Manuel de la Fuente Mata. Tunneling under squeezing conditions : Effect of the excavation method. Civil Engineering. Université Paris-Est, 2018. English. ⟨NNT : 2018PESC1071⟩. ⟨tel-02122931⟩

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