Unexpected Delay


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by Brian Russell, P.E., Project Manager; HNTB Corp., Bellevue, WA,
Gerald Dorn, P.E., Lead Structural Engineer; HNTB Corp., Bellevue, WA,
Sean Cassady, S.E., Lead Fire Protection and Ventilation Engineer; HNTB Corp., Bellevue, WA,
Yang Jiang, P.E., Ph.D., Tunnel Liner Structural Engineer; HNTB Corp., Bellevue, WA,
Gordon Clark, P.E., Technical Director, Tunnels and Complex Underground Structures; HNTB Corp., Salt Lake City, UT,
Andrew Herten, S.E., Senior Project Engineer, Structural Construction Engineer; HNTB Corp., Bellevue, WA,
Thomas Cossette, P.E., Interior Structures Structural Engineer; HNTB Corp., Bellevue, WA,
, P.E.

Serial Information: Civil Engineering—ASCE, 2019, Vol. 89, Issue 12, Pg. 58-58


Abstract: The biggest project risk in Washington State's new State Route 99 tunnel was at the south end, where the tunnel begins. If the tunnel boring machine (TBM) could tunnel through that initial zone problem-free, Seattle Tunnel Partners (STP, the design/build joint venture) and HNTB Corp. (the tunnel's lead designer and engineer of record) were confident the remaining portion of the drive would be relatively risk-free.

Subject Headings: Tunnels | Risk management | Project management | Boring | Equipment and machinery | Design-build | Joint ventures | Washington | United States | Seattle

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