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Modeling of time-dependent and anisotropic behavior of highly squeezing ground : Application to the Saint-Martin-la-Porte exploratory galleries of the Lyon-Turin link

Abstract : Operational difficulties are frequently encountered during the excavation of tunnels in squeezing ground because of large, time-dependent and often anisotropic deformation. In the context of the future Lyon-Turin link, an access gallery (SMP2) and a survey gallery (SMP4) are excavated by conventional method in Saint-Martin-la-Porte (SMP) in France. A strongly tectonized Carboniferous formation was crossed which is highly fractured and heterogeneous. Squeezing behavior was observed and led to instability of support system and tunnel face. Specific excavation and support methods were adopted with an extensive field monitoring program. During the past years, several studies have been carried out to analyze the squeezing rock behavior and the interaction between the ground and the support system in SMP2: a processing procedure of anisotropic convergence data has been proposed and an anisotropic visco-elastic-plastic constitutive model has been developed and implemented in Flac3D code.On the basis of the gained knowledge and the new available field data, developed tools for data processing and numerical simulation of SMP2 are extrapolated for longer-time scale and applied to the conditions encountered in SMP4, which is much deeper and excavated in another direction. By extending the proposed method and applying the obtained values of parameters, field data are studied for the anisotropic closure of different parts of SMP4 taking into account the stages of excavation and support installation to predict long-term convergence of the galleries. The developed anisotropic visco-elastic-plastic constitutive model in the previous studies is improved to simulate the mid-term and long-term behavior of SMP2 considering the excavation stages, the specific yielding support and the reprofiling process. Different excavation profiles of SMP4 are modeled. The constitutive parameters are identified and the ground and tunnel response is well reproduced
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Submitted on : Wednesday, November 24, 2021 - 5:46:11 PM
Last modification on : Thursday, November 25, 2021 - 3:45:30 AM

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Yichun Liu. Modeling of time-dependent and anisotropic behavior of highly squeezing ground : Application to the Saint-Martin-la-Porte exploratory galleries of the Lyon-Turin link. Géotechnique. Université Paris-Est, 2020. English. ⟨NNT : 2020PESC1028⟩. ⟨tel-03447636⟩

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