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Washington Dulles Airport Pedestrian Walkback Tunnel
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| Service: | Final design including FEM structural calculations.
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| Estimated cost: | Commencement: | February 01, 1998
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Completion date: | December 01, 2001
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| Location: | 45045 Aviation Drive Dulles, VA 20166-7528 United States |
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| Technical data: | Pedestrian Walkback tunnel, accommodating two moving and one central fixed walkways, 770 ft long, Section of 41 ft x 27 ft. A Mechanical Room with a 37 ft long x 32 ft. span . Tunnel passing 15 ft beneath the main airport taxiways. |
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| Geology description: | Residual soils, decomposed rock and siltstone bedrock. |
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| Bid cost: | Final cost: | $13 million USD
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| Overburden: | Min:10 Max:20
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| Excavation area: | Min:1200 Max:1200
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| Tunnel length: | Min:770 Max:770
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Description
An extensive underground people-mover train system and a fixed walkway tunnel between terminals are central to a multi-phased mega program of modernization and expansion for the Washington Dulles International Airport. The pedestrian walkback tunnel, a part of the expansion plan, crosses below two airport taxilanes and will connect the Main Terminal with Mid-Field Concourse B. The tunnel was designed as a multiple-drift NATM excavation, whereby cover beneath the taxilanes was less than a tunnel diameter at only 4.5 m. Excavation was therefore designed as a very controlled sequence with top heading excavation further divided into two side drifts.
