REINFORCING THE ENA-SAN TUNNEL

Large-scale rock faults and the effects of hydrothermal action have caused construction problems of Japan's Ena-San tunnel. With an overall length of 8500 M the tunnel is the second longest vehicle tunnel in the world compared with Europe's Mont Blanc tunnel. The Ena-San Tunnel has a vehicle capacity of 2000 vehicles per hour compared with the 450 vehicles per hour of the Mont Blanc tunnel. Severe hydrothermal action on a section of granite has caused earth pressures of 70-100 t/sq M. To counteract this the side drift method of reinforcement was used with double steel h-shaped supports and a concrete lining. To repair sections of this lining, cracked by earth pressure, the lining was replaced by a steel-fibre reinforced secondary concrete lining applied using steel lining forms and concrete pumps. The fibre/concrete mix used Tesusa fibres measuring 0.5 X 0.5 x 30 mm long in a 1.5 per cent by volume mix having A compressive strength of 400 kg/sq cm and a bending strength of 100 kg/sq cm.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/10480594
• Corporate Authors:

  Morgan-Grampian (Professional Press) Limited

  Morgan-Grampian House, Calderwood Street
  London SE18 6QH,   England 
• Publication Date: 1976-10

Language

• English

Media Info

• Features: Photos;
• Pagination: p. 52-53
• Serial:
  • Civil Engineering
  • Publisher: American Society of Civil Engineers
  • ISSN: 0885-7024
  • Serial URL: http://www.pubs.asce.org/ceonline/newce/html

Subject/Index Terms

• TRT Terms: Chemical reactions; Concrete; Construction management; Cracking; Earth pressure; Fibers; Material reinforcement; Mix design; Reinforced concrete; Repairing; Tunnel lining; Tunneling; Tunnels
• Uncontrolled Terms: Active earth pressure
• Geographic Terms: Japan
• Old TRIS Terms: Hydrothermal reactions
• ITRD Terms: 4755: Concrete; 3666: Construction method; 5211: Cracking; 5726: Earth pressure (active); 4557: Fibre; 8053: Japan; 4714: Mix design; 3471: Reinforcement (in mater); 3635: Repair; 3374: Tunnel; 3385: Tunnel lining
• Subject Areas: Bridges and other structures; Construction; Highways; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00159771
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Dec 27 1977 12:00AM