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- W27329557 abstract "During the excavation of the Saint-Martin La Porte inclined gallery (section 80 m length 2000 m), along the Lyon-Turin Base tunnel a rock mass of very poor quality was encountered pertaining to the Carboniferous Formation. Different ground support systems were implemented and the convergence measurements carried out confirmed the ground to exhibit a very severe squeezing behaviour. Convergences of approximately two meters were observed as soon as the overburden reached three hundred meters. As a result significant changes in the excavation and ground support system were required, Figure 1 (Barla and Panet, 2006). The inclined gallery is currently under construction and is faced with exceptional difficulties over a significant tunnel length. The present paper is to discuss the observations and monitoring data collected during excavation. In addition to systematic convergence measurements, the information obtained in instrumented sections will be discussed. The feedback from experience gained will be directly used for the excavation of the main tunnel, which is expected to be driven in similar conditions. One of the main challenges is the optimal time for installing the final lining, and also in the assessment of the long term state of stress for design. Consequently, particular attention need be paid at identifying the long term behaviour and the mechanical properties of the squeezing rock mass." @default.
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- W27329557 date "2007-01-01" @default.
- W27329557 modified "2023-09-27" @default.
- W27329557 title "Lessons learned during the excavation of the Saint Martin La Porte access gallery along the Lyon-Turin Base tunnel" @default.
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