GETTING IT RIGHT AT GATHRIGHT

A tunnel excavation in Los Angeles, California, is described in which a world record is claimed for a single day's advance in hard rock. During excavation as part of the Gathright dam flood control project, an 8ft wide by 16ft high tunnel was advanced a distance of 128ft in a 24-hour, 3-shift period. Working in limestone rock which in some sections was able to stand unsupported, three jackleg drills on a mucker mounted platform were used to drill 18-24 holes 6ft deep in the rock followed by blasting. The tunnel forms part of the underground foundation treatment which requires the construction of an 8ft thick concrete underground cut-off wall 820ft long within the left abutment of the dam's foundations. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0041414X
• Corporate Authors:

  Morgan-Grampian Limited

  30 Calderwood Street
  London SE18 6QH,   England 
• Publication Date: 1975-11

Language

• English

Media Info

• Features: Photos;
• Pagination: p. 57
• Serial:
  • Tunnels & Tunnelling International
  • Volume: 7
  • Issue Number: 6
  • Publisher: Progressive Media Markets, Ltd
  • ISSN: 0041-414X

Subject/Index Terms

• TRT Terms: Abutments; Construction; Construction management; Dams; Drills; Excavation; Excavations; Flood protection; Foundations; Limestone; Presplitting; Retaining walls; Rocks; Tunneling; Tunnels; Underground structures
• Uncontrolled Terms: Quick; Subterranean
• Geographic Terms: United States
• Old TRIS Terms: Rock tunneling
• ITRD Terms: 3666: Construction method; 5155: Excavation (process); 4131: Limestone; 9064: Quick; 3359: Retaining wall; 4154: Rock; 4372: Subterranean; 3374: Tunnel; 8122: USA
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00137508
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Oct 6 1976 12:00AM