This article describes preparation for the first of three huge tunnel jacking operations in the Central Artery in Boston, USA; it includes a map of its locality. The operations are occurring at the South Bay Interchange between the I-90 and I-93 highways. As it approaches the centre of Boston, a new elevated section of the I-93 will be linked to the I-90 and its new extension east to Logan Airport. The extension will be built in cut-and-cover, jacked tunnels, and immersed tube tunnels under the Fort Point Channel. At the South Bay Interchange, the tunnel jacking operations will take the I-90 from an exit ramp in the immersed tunnel under eight railway lines with heavy traffic, and on towards the I-93 in the downtown area. The site is 200m by 300m, bounded by existing roads and buildings, and by the Fort Point Channel. Previous reclamation and construction works have left variable sand, silt, and gravel fill with a variety of construction material, including concrete, steel and timber, and granite blocks. Under the fill, there are layers of sands, silts, and peats overlying Boston Blue Clay. There will be full-size tunnel jacking for building the tunnels under the tracks, and the tunnel sections are being built in three jacking pits. 1800 steel freeze pipes have been installed in and around the tracks.

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    LONDON,   United Kingdom  EC1R 4QX
  • Publication Date: 1999-7


  • English

Media Info

  • Pagination: p. 24-5
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00769900
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Oct 7 1999 12:00AM