HIGH WATER PRESSURE COMPLICATES ARROWHEAD TUNNELS

This article profiles the Arrowhead tunnels in the Inland Feeder project, a 44-mile water conveyance system intended to deliver water to local groundwater basins in southern California. While the tunneling efforts first began in 1997, the contract was terminated in 2000 due to grouting problems and the fact that water penetration permit levels had been exceeded. This second attempt features two 19- ft-in-diameter advanced tunnel boring machines (TBMs) as well as a new tunnel and lining design. Efforts are being hampered by difficult geology, fault zones, groundwater volume and pressure control, as well as mudslides. The article details the various equipment and engineering specifications, such as the placement of precast segments that are lifted into place by vacuum, the different types of grout used, and TBM operation, all of which are controlled by computer.

Language

  • English

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 22-24
  • Serial:
    • ENR
    • Volume: 254
    • Issue Number: 21
    • Publisher: McGraw-Hill, Incorporated
    • ISSN: 0891-9526

Subject/Index Terms

Filing Info

  • Accession Number: 01001746
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Jul 7 2005 12:00AM