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Dulles Airport Pedestrian Walkback Tunnel

Washington Dulles International Airport (IAD)

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).

Tunnel Design and Construction Support:

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)