ABSTRACT
The Quebec Ministry of Transportation is undertaking major structural rehabilitation work and systems upgrade on the La Fontaine Tunnel to comply with current codes, standards and best practices in fire life safety and to extend the lifespan of this 55-year-old immersed tube tunnel for another 40 years.
The paper will discuss final design consideration of ongoing works that include structural analyses and repair strategies for the post-tensioned reinforced caissons, the scheme to repair two leaky joints between caissons, the design of passive fire protection that involved in situ and real scale laboratory tests, and other tunnel systems upgrades.
