TITLE

Japanese Tunneler Digs In For Seattle Light Rail Project

AUTHOR(S)
McFall, Kathleen
PUB. DATE
March 2005
SOURCE
ENR: Engineering News-Record;3/28/2005, Vol. 254 Issue 12, p17
SOURCE TYPE
Trade Publication
DOC. TYPE
Article
ABSTRACT
The article informs that bite by bite, tunnelers will push through layers of glacial deposits to build a crucial section of Sound Transit 's $2.4-billion, 14-mile light rail system that will eventually connect downtown Seattle to the Seattle-Tacoma International Airport. The Beacon Hill segment consists of two parallel 4,300-ft-long, 18.8-ft-dia tunnels to be built with a 335-ton earth pressure balance tunnel-boring machine. Work has just begun on Beacon Hill, essential to the system's 2009 completion date. In the project area, bedrock is estimated at 3,000 ft deep beneath overlapping sands, gravels, silts, clays and tills varying from rock boulders to soft soils. Recent seismic data also suggest the presence of active faults. The tunnels will be bored along a roughly 5 percent grade. The primary mucking system will include a 24-in.-wide advancing conveyor with 12 muck cars.
ACCESSION #
16619807

 

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