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6. Considerations for the choice of construction methods
6.1 Selection criteria
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Numerous criteria will guide the choice of construction method for an underground structure.
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Length of structure
This is a major criterion when it comes to choosing a mechanized method (TBM): the supply of a TBM is a significant investment, and only a sufficiently long tunnel length can make this investment profitable.
A minimum tunnel length of the order of one kilometer can be assumed to justify the use of a TBM, with exceptions of course (e.g. unfeasibility of building the structure using conventional methods, availability of a machine suited to the geometric and geotechnical context of the structure).
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Considerations for the choice of construction methods
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Bibliography
Standards and norms
CCTG fascicule 69 "Travaux en souterrains" of 20/01/2012 (approved by the decree of May 30, 2012) and its application guide (25/10/2019)
https://www.economie.gouv.fr/daj/fascicule69-cctg-mp-travaux-genie-civil-travaux-en-souterrain
AFTES: The Association...
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AFTES: French Tunnel and Underground Space Association
CETU: Center for Tunnel Studies
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