EXTRAORDINARY INUNDATION ACCIDENTS IN THE SEIKAN UNDERSEA TUNNEL

The Seikan Tunnel's undersea section runs for about 23.3 km under the sea-bed, the geology around which is characterized by Neogene sedimentary rocks. The planned undersea route of the tunnel had a maximum depth of 140 m under the water surface, with a minimum of overburden of 100 m. Excavation of pilot tunnels, service tunnels and main tunnels proceeded in this order from both ends of the route. The construction work encountered four major extraordinary inundation accidents. They occurred at fractured zones embrittled by intrusions of igneous rock dykes or softened by faults. This experience led to the establishment of measures against extraordinary inundation of water. Subsequently, no further inflows stopped the tunnelling work through fragile or soft fractured zones and extremely loose base rocks. (A)

Language

  • English

Media Info

  • Pagination: p. 1-14
  • Serial:
    • Volume: 119
    • Issue Number: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00720832
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: May 24 1996 12:00AM