This report presents the results of a field evaluation of advanced methods of subsurface exploration on an ongoing urban rapid transit tunneling project. The objective of this study is to evaluate, through a field demonstration project, the feasibility, applicability, reliability, and cost effectiveness of selected advanced methods of subsurface exploration and instrumentation to produce data usable for rapid transit tunnel design and construction within the time, cost, and schedule constraints common to the industry. Numerous methods of subsurface exploration, including hole advancement techniques, sampling procedures, and geophysical logging tools, were used to predict stratigraphy within a test section on an urban rapid transit project under construction. A test section on the Massachusetts Bay Transportation Authority Red Line Extension-Northwest, Cambridge, Massachusetts, was selected to evaluate methods of subsurface exploration used to investigate stratigraphy, ground water levels, bedrock structure, and other geotechnical parameters. The site represents a typical urban setting with the test section located under a major, four-lane divided street, with structures adjacent on both sides.

  • Supplemental Notes:
    • Prepared in cooperation with Haley and Aldrich, Inc., Cambridge, MA.
  • Corporate Authors:

    Bechtel Corporation

    50 Beale Street
    San Francisco, CA  United States  94119

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142

    Urban Mass Transportation Administration

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Thompson, D E
    • Humphrey, J T
    • Young, L W
    • Wall, C F
  • Publication Date: 1980-6

Media Info

  • Pagination: 405 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318485
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DOT-TSC-UMTA-80-1 Final Rpt.
  • Contract Numbers: DOT-TSC-1570
  • Files: NTIS, TRIS, USDOT
  • Created Date: Oct 27 1981 12:00AM