A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Managing Settlement Risk Due to Tunneling beneath Downtown Seattle
Seattle's Alaskan Way Viaduct is to be replaced by a 2.7-kilometer- (1.7-mile-) long, 17.5-meter- (57.5-foot-) diameter, deep-bored tunnel directly beneath the downtown urban core. Seattle Public Utilities (SPU) owns and maintains more than 1,300 water and sewer pipes in the vicinity of the proposed tunnel alignment. The Washington State Department of Transportation (WSDOT) prepared surface settlement estimates based on a uniform level of tunnel ground loss and identified utilities that could be damaged. SPU has a proactive asset management strategy and wanted to define the probable risks to its aging infrastructure from tunnel-induced deformations, taking into account uncertainty due to tunneling difficulty and problematic ground conditions. Probabilistic factors were used in developing a probabilistic distribution for ground deformations, allowing each utility to be evaluated for deformations that would exceed established limits. A risk matrix was developed to compare deformation limit exceedances with established levels, quantifying the utility system's overall risk and providing SPU with a solid strategy for mitigating the potential for system disruption.
Managing Settlement Risk Due to Tunneling beneath Downtown Seattle
Seattle's Alaskan Way Viaduct is to be replaced by a 2.7-kilometer- (1.7-mile-) long, 17.5-meter- (57.5-foot-) diameter, deep-bored tunnel directly beneath the downtown urban core. Seattle Public Utilities (SPU) owns and maintains more than 1,300 water and sewer pipes in the vicinity of the proposed tunnel alignment. The Washington State Department of Transportation (WSDOT) prepared surface settlement estimates based on a uniform level of tunnel ground loss and identified utilities that could be damaged. SPU has a proactive asset management strategy and wanted to define the probable risks to its aging infrastructure from tunnel-induced deformations, taking into account uncertainty due to tunneling difficulty and problematic ground conditions. Probabilistic factors were used in developing a probabilistic distribution for ground deformations, allowing each utility to be evaluated for deformations that would exceed established limits. A risk matrix was developed to compare deformation limit exceedances with established levels, quantifying the utility system's overall risk and providing SPU with a solid strategy for mitigating the potential for system disruption.
Managing Settlement Risk Due to Tunneling beneath Downtown Seattle
Lach, Michael A. (author)
Georisk 2011 ; 2011 ; Atlanta, Georgia, United States
GeoRisk 2011 ; 996-1003
2011-06-21
Conference paper
Electronic Resource
English
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