Fault Crossing Design of 66-Inch Pipeline: San Francisco Hetch Hetchy Water System

This paper describes the fault crossing design of a new 66-inch buried pipeline. The new pipeline together with three older (69-, 90-, and 96-inch diameter) pipelines called Alameda Siphons connect the Coast Range Tunnel (CRT) on the east to the Irvington Tunnel on the west of the approximately 0.5-mile wide Sunol Valley. Near the eastern end of the valley, the pipelines cross the Calaveras Fault. The new pipeline was designed to remain in continuous operation when subjected to approximately 4-feet of fault displacement to meet the reliability goal of 120 million gallons/day within 24 hours of the earthquake. The design considered uncertainty in fault location, rupture displacement, and subsurface conditions. Design considerations also included pipeline alignment across the fault, pipe thickness, exterior coating and interior lining, trench design and backfill properties. An important aspect of the design was the tie-in to the existing 1933 era CRT portal located approximately 500 feet from the fault crossing location.

• Record URL:
  https://doi.org/10.1061/9780784479117.155
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784479117
• Supplemental Notes:
  • © 2015 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Nisar, A
  • Nervik, A
  • Li, A
• Conference:
  • Structures Congress 2015
  • Location: Portland Oregon, United States
  • Date: 2015-4-23 to 2015-4-25
• Publication Date: 2015-4

Language

• English

Media Info

• Media Type: Web
• Pagination: pp 1798-1809
• Monograph Title: Structures Congress 2015

Subject/Index Terms

• TRT Terms: Design; Dislocation (Geology); Geological phenomena; Pipelines; Tunnels
• Geographic Terms: San Francisco (California)
• Subject Areas: Design; Pipelines; I20: Design and Planning of Transport Infrastructure;

Filing Info

• Accession Number: 01562456
• Record Type: Publication
• ISBN: 9780784479117
• Files: TRIS, ASCE
• Created Date: Apr 29 2015 9:07AM