Technical Papers

Time-Dependent Behavior of Saint-Martin-La-Porte Exploratory Galleries: Field Data Processing and Numerical Modeling of Excavation in Squeezing Rock Conditions

Yichun Liu, Ph.D.1; Jean Sulem, Ph.D.2; Didier Subrin, Ph.D.3; Huy Tran-Manh, Ph.D4.

1. Laboratoire Navier, CERMES, Ecole des Ponts ParisTech, Univ. Gustave Eiffel, CNRS, 6–8 Avenue Blaise Pascal, 77455 Marne-la-Vallée, France. ORCID: https://orcid.org/0000-0002-9634-9797.
2. Laboratoire Navier, CERMES, Ecole des Ponts ParisTech, Univ. Gustave Eiffel, CNRS, 6–8 Avenue Blaise Pascal, 77455 Marne-la-Vallée, France (corresponding author). ORCID: https://orcid.org/0000-0001-9851-3936.
3. Centre d’études des tunnels (CETU), 25 Avenue François Mitterrand, 69500 Bron, France
4. Itasca Consultants SAS, 29 Avenue Joannes Masset, 69009 Lyon, France

Abstract

Field monitoring programs (e.g., convergence measurements and stress measurements in the support system) play an important role in following the response of the ground and of the support system during and after excavation. They contribute to the adaptation of the excavation and support installation method and the prediction of the long-term behavior. In the context of the Lyon–Turin link project, an access gallery (SMP2) was excavated between 2003 and 2010, and a survey gallery (SMP4) has been excavated since 2017. Both tunnels are excavated in Saint-Martin-la-Porte (France) across a strongly tectonized Carboniferous formation, which is highly fractured and heterogeneous. Squeezing behavior has been observed and led to the instability of the support system and of the tunnel face in various locations. Based on the knowledge gained from field data processing and numerical modeling in SMP2, new field data are analyzed for SMP4, which is excavated at a much deeper depth, with a different orientation and with different excavation methods. Numerical modeling of the various profiles of SMP4 considering the excavation stages and the specific yielding support is presented, which predicts the time-dependent response of the tunnel.

Latest News
  • ITASCA Unveils XSite 4.0: Advancing Hydraulic Fracturing Simulation ITASCA announces the launch of XSite 4.0, a groundbreaking advancement in hydraulic fracturing simulation software....
    Read More
  • ITASCA Congratulates the Winners of the 2024 PETER A. CUNDALL AWARD Congratulate to those who were selected for the 2024 PETER A. CUNDALL AWARD for their...
    Read More
  • What's New in ITASCA Software v910 Learn what new features and capabilities are available in the v910 point release of ITASCA...
    Read More

Upcoming Events
29 May
Getting Started with FLAC2D/FLAC3D
Objectives of the training: •Understand the FLAC2D/ FLAC3D numerical approach and the types ofproblems it can solve•Know how to manipul... Read More
5 Jun
IMAT Workshop
ITASCA is launching IMAT (Itasca's Mining Analysis Toolbox) our groundbreaking software tailored exclusively for underground and open p... Read More
2 Jun
6th Itasca Symposium on Applied Numerical Modeling
Itasca is pleased to announce that the 6th Itasca Symposium on Applied Numerical Modeling will take place June 3 - 6, 2024, in Toronto,... Read More