Dulles Airport Pedestrian Walkback Tunnel

Washington Dulles International Airport

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Tunnel Design and Construction Support:

The Pedestrian Walkback Tunnel at Washington Dulles International Airport (IAD) provides a connection between IAD’s main terminal and midfield Concourse B terminal.  Gall Zeidler Consultants (GZ) provided the design for the final shotcrete lining for the tunnel junction structure of the pedestrian walkway tunnel and adjoining utility tunnel.  The tunnel was constructed beneath taxiways under shallow cover using the New Austrian Tunneling Method (NATM).

GZ provided construction support during the installation of the final (inner) shotcrete final lining (SFL) after a closed wraparound PVC membrane waterproofing system was in place.

LOCATION:
Washington Dulles International Airport, Dulles, Virginia
DATE:
2001 – 2002
STRUCTURE:
Pedestrian Tunnel
LENGTH:
Approximately 800 feet (244 meters)
CROSS-SECTION:
Approximately 1,184 square feet (110 square meters)
GEOLOGY:
Residual Soil, Clay, Jointed Claystones, and Siltstones of the Balls Bluff Formation
COST:
Approximately $16.5 Million
CLIENT:
Dr. G. Sauer Corporation
OWNER:
Washington Dulles International Airport (IAD)