The objective of this study is to assess horizontal boring and exploration as an alternative to vertical boring in geotechnical investigation prior to the design and construction of tunnels. The study was divided into three separate topics: Excavation, Exploration, and Economics. Under Excavation, new ideas and preliminary designs were developed for continuous, maneuverable penetration out to distances of 5000 ft (1500 m). Detailed methodology is presented for penetration to 2000 to 3000 ft (610 to 915 m) with recently developed equipment and technology. Under Exploration, preliminary designs were developed for down-hole seismic (geophysical) and contact sensing. These approaches were technically evaluated by investigation of wave attenuation characteristics and hole disturbance. Under Economics, horizontal penetration (with on-board sensing and separate follower sensing) was compared for cost effectiveness with vertical boring and surface geophysics. In addition, the cost of unanticipated conditions was summarized from case histories to assess the value of the various exploration approaches. /FHWA/

  • Corporate Authors:

    Massachusetts Institute of Technology

    Construction Facilities Division
    Cambridge, MA  United States  02139

    Titan Contractors Corporation

    3445 American River Drive
    Sacramento, CA  United States  92501

    Draper (Charles Stark) Laboratory, Incorporated

    555 Technology Square
    Cambridge, MA  United States  02139

    Weston Geophysical Corporation

    Westboro, MA  United States 

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Dowding, C H
  • Publication Date: 1976-2

Media Info

  • Pagination: 398 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00190056
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-76- 1 Final Rpt., FCP 35B2-042
  • Contract Numbers: DOT-FH-11-8526
  • Files: NTIS, TRIS, USDOT
  • Created Date: May 26 1979 12:00AM