Construction of a Mixed Face Reach through Granitic Rocks and Conglomerate
Abstract
The San Vicente Pipeline Tunnel Project involves construction of an 8.5-foot diameter water pipeline in an 11-mile tunnel. Excavation takes place in variable geologic conditions consisting of strong granitic and volcanic rocks, weak sedimentary rocks, abrasive conglomerates, and mixed face conditions. One 5,200-foot mixed face reach included Friars Formation Conglomerate overlying granitic rock. The excavation in this reach employed drill-and-blast and NATM methods.
2007
Rapid Excavation and Tunneling Conference (RETC) Proceedings
Michael A. Krulc
Traylor Shea Joint Venture
John J. Murray
Jacobs Associates
Michael T. McRae
Jacobs Associates
Kathy L. Schuler
San Diego County Water Authority