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HomeNewsProject RelatedGeotechnical Engineering of the new Tacoma Narrows Bridge

Geotechnical Engineering of the new Tacoma Narrows Bridge

October 8, 2007 rockman Project Related Comments Off on Geotechnical Engineering of the new Tacoma Narrows Bridge
  • 7 Engineering Wonders: Geotechnical — A firm foundation for the new Narrows Bridge by Gerard Buechel
  • Wikipedia article on Tacoma Narrows Bridges

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Voids Open as a Result of Tunneling Under Seattle’s Beacon Hill

May 7, 2009 rockman Project Related Comments Off on Voids Open as a Result of Tunneling Under Seattle’s Beacon Hill

image The Seattle Times (hat tip to ASCE SmartBrief) has reported that seven voids have been discovered above the Beacon Hill Tunnel with one opening up at the ground surface. The tunnel is being constructed by Sound Transit, the area’s transportation agency as part of a roughly $2.6 billion (yep, billion) light-rail project connecting downtown Seattle with the University of Washington and SEA-TAC airport. The voids were a result of running sand pockets in the otherwise stable clay units that were encountered by the tunnel boring machine or TBM. These voids migrated up like a chimney with one reaching the surface, almost 160-ft above the tunnel. This void was apparently 21-ft deep and opened up in a resident’s front yard and could have easily swallowed her up as she noticed it while gardening. The other voids were discovered at a depth of 20- to 65-ft below the ground surface. More after the break. (Illustration from Seattle Times)

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