New Irvington Tunnel Design Challenges
Abstract
The San Francisco Public Utilities Commission (SFPUC) is designing the 5.6-km-long (3.5-mi-long) New Irvington Tunnel from the Sunol Valley to the City of Fremont in Alameda County, California, with a minimum finished diameter of 2.6 m (8.5 ft). The tunnel will have a two-pass lining system―an initial support system (such as steel sets) and a final lining consisting of steel pipe, concrete pipe, or cast-in-place concrete. Ground conditions are anticipated to be difficult and highly variable, with groundwater heads of 113 m (370 ft) and potential inflows as high as 95 L/sec (1,500 gpm). This paper discusses some of the issues faced during design of the tunnel, including potential risks associated with construction.
2010
North American Tunneling (NAT) Conference Proceedings
Glenn Boyce
Jacobs Associates
Steve Klein
Jacobs Associates
Yiming Sun
Jacobs Associates
Theodore Feldsher
URS Corporation
David Tsztoo
San Francisco Public Utilities Commission
