The twentieth century

Published on 26 February 2008
Assembly of the Eastern tunnel boring machine for the 10 km long A86 West tunnel.
Assembly of the Eastern tunnel boring machine for the 10 km long A86 West tunnel.
(Photo : Socatop)

The main developments that have occurred during the 20th century involve:

  • the decisive improvement, in the second half of the centruy, in the ability to calculate the stresses acting on the structure,
  • tunnelling and supporting techniques
  • and the increasing importance of ventilation and safety systems.

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