The tunnel replacing the Alaskan Way Viaduct (SR-99) will pass beneath 158 existing structures requiring an extensive program of vibration and settlement monitoring as well as some remediation. Of the 158 buildings, WSDOT identified 20 as needing some remediation, but the contractor has shortened that list to 7 structures. For those 7 the tolerable settlement is 1/2 inch, for the remaining, it is 1 inch. Remediation will consist of grouting in at least one case, and micropile walls in other cases where the tunnel alignment doesn’t pass directly underneath the structure. The existing viaduct will also get micropiles for stabilization. Utility relocation and geotechnical instrumentation will take place this year with additional work beginning next year. Tunneling won’t begin until mid-2013 on the $1.4 Billion megaproject. [Source: Seattle Times Newspaper. Image: Storify]
Related Articles
New Publication: Landslides and Engineering Geology of the Seattle, Washington Area
November 4, 2008
rockman
Available Resources
Comments Off on New Publication: Landslides and Engineering Geology of the Seattle, Washington Area
Devil’s Slide excavation completed for both tunnels
February 10, 2011
rockman
Project Related
Comments Off on Devil’s Slide excavation completed for both tunnels
Crux Subsurface Wins Two 2014 DFI Awards
Congratulations to Crux Subsurface, Inc. on winning the Deep Foundation Institute’s (DFI) 2014 Outstanding Project Award (OPA) and the 2014 C. William Bermingham Innovation Award for their Sunrise Powerlink Project in California. The project involved […]