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Article Dans Une Revue Geomechanics and Tunnelling/Geomechanik und Tunnelbau Année : 2014

Full-face versus sequential excavation - A case study of the Chamoise Tunnel (France)

Résumé

Construction of the 3300m long Chamoise Tunnel in the French Jura Mountains had to overcome long sections of swelling marls beneath an overburden of 400m. During the design phase a reconnaissance gallery of 9m2 was driven to investigate the geological conditions over the entire length of the tunnel. The findings of the gallery led the designer to choose the NATM. The North Tube was constructed between 1981 and 1984. The South Tube was constructed about 10 years later. The main revolution in methodology was the change from sequential to fullface excavation in the marl sections. Applied for the first time for the Chamoise Tunnel, the economic benefits of fullface excavation even in poor ground, largely due to the reduction of works cycles and the use of bigger machines, initiated a general trend from sequential towards fullface excavation in France. In our article we present the methodological differences between the tunnel drives of Chamoise North and South Tubes. The comparison is supported by a numerical backanalysis of the observed ground behaviour. In addition, the role of faceconfinement is examined. The study shows that in the case of Chamoise Tunnel, the excavation sequence has little influence on the shortterm ground behavior and that face confinement would have been of no use. From an economical point of view, the most significant difference between the two tunnel drives are the mean advance rates, which were about 20% higher for fullface excavation (without face reinforcement) than the rates achieved by sequential (3staged) excavation.

Dates et versions

hal-01214457 , version 1 (12-10-2015)

Identifiants

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Martin Putz, Nicolas Gilleron, Emmanuel Bourgeois, Adrien Saïtta. Full-face versus sequential excavation - A case study of the Chamoise Tunnel (France). Geomechanics and Tunnelling/Geomechanik und Tunnelbau, 2014, 7 (5), pp 469-480. ⟨10.1002/geot.201400034⟩. ⟨hal-01214457⟩
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