DRILLING AND PREPARATION OF REUSABLE, LONG RANGE, HORIZONTAL BORE HOLES IN ROCK AND IN GOUGE. VOLUME I. STATE-OF-THE-ART ASSESSMENT

The objective of this study is to assess horizontal drilling as an alternative to pilot tunneling in geological investigation prior to the design and construction of highway tunnels and to identify means to increase the penetration capability and accuracy and decrease the cost of horizontal drilling. This volume assesses the horizontal penetration capabilities of available drilling equipment. The drilling of horizontal holes to a maximum length of 5000 ft. (1524 m) is found to be technically feasible and to offer an order of magnitude cost reduction over pilot tunneling. Limitation present day equipment and techniques are identified and means to overcome these limitations are indicated. This is the first of three volumes. Volume II is published as FHWA-RD-75-96, subtitle: Estimating Manual for Time and Cost Requirements. Volume III is published as FHWA-RD-75-97, subtitle: A Development Plan to Extent Penetration Capability, Increase Accuracy, and Reduce Costs. /FHWA/

• Corporate Authors:

  Foster-Miller Associates, Incorporated

  350 Second Avenue
  Waltham, MA  United States  02254

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Harding, J C
  • Rubin, L A
  • Still, W L
• Publication Date: 1975-10

Media Info

• Pagination: 256 p.

Subject/Index Terms

• TRT Terms: Accuracy; Boreholes; Costs; Drilling; Feasibility analysis; Geological surveying; Gouges; Pendulum tests; Rocks; State of the art studies; Structural design; Tunnels
• Uncontrolled Terms: Tunnel design
• Old TRIS Terms: Geologic investigations
• Subject Areas: Bridges and other structures; Construction; Finance; Geotechnology; Highways;

Filing Info

• Accession Number: 00131389
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: FHWA-RD-75- 95 Final Rpt., FCP-35B2-042
• Contract Numbers: DOT-FH-11-8486
• Files: TRIS, USDOT
• Created Date: May 14 1976 12:00AM