Publications

Rehabilitation of the Big Walker Mountain Tunnel in Bristol, Virginia

Rehabilitation of the Big Walker Mountain Tunnel in Bristol, Virginia
NAT 2004

Complete transformation for the Cameron culverts

Complete transformation for the Cameron culverts
T&T North America 5/01

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Tunnel Rehabilitation

Tunnel Widening

Many older tunnels today are either not used to their full potential or are not used at all due to their structural condition.  These older tunnels can be widened in order to accommodate larger freight trains, trucks, light rail or to increase the traffic capacity and in the case of leaking tunnels and deteriorated tunnels can be rehabilitated creating a dry and safe environment.

Tunnel widening can be accomplished utilizing the principals of NATM.  After appropriate pre-support is installed, the existing tunnel lining is removed in sections and a new shotcrete lining is installed.  In order to preserve the quality of the tunnel inner lining as well as the utilities and finishes in the tunnel, a waterproofing system is installed against the shotcrete lining then the inner lining is constructed.

Tunnel Rehabilitation

In cases where the existing tunnel size is sufficient but the structural lining, finishes and utilities are deteriorated due to water ingress, tunnel rehabilitation is recommended by designing a solution that incorporates Dr. Sauer Group’s four principles.

  1. Where does the water come from?
  2. How can the water be drained?
  3. How will the drainage system be maintained in the future?
  4. How to prevent water from freezing and clogging the drainage system?

The resulting rehabilitation will provide a safe environment for the public and maintenance workers as well as extending the life of ventilation, mechanical and electrical fixtures