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University Link - Execution

Owner:
Client:
Service:
Site supervision services, consulting and monitoring.
Estimated cost: Commencement:
December 01, 2011
Completion date:
August 01, 2012
Location:
401 S. Jackson Street
Seattle, WA 98104
United States
Technical data:
Geology description:

The geology along the alignment consists of over-consolidated glacial clay and till with fractured zones, as well as sand and silt layers.

Geology types:
Activity:
Categories:
Bid cost: Final cost:
$1.6 billion USD
Service areas:
Construction methods:
Description

University Link is a 5km light rail extension that runs in twin-bored tunnels from Downtown Seattle north to the University of Washington, with stations at Capitol Hill and on the University of Washington campus. The project further includes 20 cross passages located in soft ground and a maximum design water head of 60m. To deal with the prevailing geological conditions, specific ground support categories were developed. Steel fiber reinforced initial lining, sheet membrane waterproofing and CIP final lining were utilised.

Cross passage excavation
Propping of TBM tunnel at cross passage
Probe drilling at cross passage
Finished cross passage