The article describes Washington D.C.'s Metrorail, the rapid rail transit that represents the best in transportation design and innovation. The architectural features are described that assure the public of safety and spaciousness. Concrete was selected as the basic building and finishing material. The tracks run at grade, in underground tunnels, on embankments, and on aerial structures, many of which are post-tensioned concrete. Geology in the Washington area being very variable, a wide variety of construction methods and techniques were used in the underground construction. 'Cut and cover' construction was used where the structures were relatively shallow or the geology did not permit tunneling for the size of the structure needed. Where geology permitted and the alignment was deep, tunneling was used, ranging from hand-mining to tunnel boring machines. Tunnel liners ranged from cast-in-place to precast concrete, shotcrete, nonreinforced concrete, and fabricated steel and cast iron liners.

Media Info

  • Features: Figures; References;
  • Pagination: p. 34-36
  • Serial:
    • Concrete International
    • Volume: 14
    • Issue Number: 2
    • Publisher: American Concrete Institute (ACI)
    • ISSN: 0162-4075

Subject/Index Terms

Filing Info

  • Accession Number: 00618911
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 29 1992 12:00AM