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  5. Considerations for the choice of construction methods

Quizzed article | REF: C5583 V1

Tunnels excavation - Construction methods and geotechnics

Authors: Alain GUILLOUX, Hervé LE BISSONNAIS, Martin CAHN, Jean Pierre JANIN

Publication date: September 10, 2021, Review date: September 7, 2021 | Lire en français

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    6. Considerations for the choice of construction methods

    6.1 Selection criteria

    • Numerous criteria will guide the choice of construction method for an underground structure.

      • 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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