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]
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New Publication: Landslides and Engineering Geology of the Seattle, Washington Area
November 4, 2008
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Solid Foundation for Grain Storage
URETEK ICR was contacted regarding settlement in two identical 1.5 million bushel grain flat storage buildings. The overall structure dimensions were 600 ft. long by 135 ft. wide with a Quonset style roof . Below the floor of the storage buildings, a tunnel with conveyance system and a series of aeration tunnels were installed to facilitate moisture control and grain transport.
[Editor] Check out the rest of this contributed Article from Ty Taylor of URETEK ICR, a GeoPrac.net sponsor. Ty describes how the foundations were lifted and stabilized using the URETEK Method® [/Editor]