The purpose of this report is to provide a detailed account of the techniques employed in constructing tunnels, i.e., transit guideways, within the St. Peter sandstone by hydraulic means. The St. Peter is a unique, well compacted layer of granular material which can be excavated with relative ease (soft ground techniques) yet behaves similar to a moderately competent hard rock surrounding an opening. This hydraulic method has resulted in tunneling costs substantially below the national average for soft rock, and may provide a basis for reducing cost of tunnel construction in similar materials. Important in hydraulic methods is a tremendous consumption of water. Solutions for the disposal of this water have been to effect a coarse separation and dispose of the fines bearing effluent in the environment. Environmental concerns prohibit this type of pollutant, therefore alternate proposals for the disposal of the contaminant effluent must be developed. Several possibilities are suggested within the text and methods are discussed which will satisfy conditions imposed by each alternative.

  • Supplemental Notes:
    • See also RRIS 00A 058353, Bulletin 7701.
  • Corporate Authors:

    University of Minnesota, Minneapolis

    Department of Civil and Mineral Engineering, 122 Civil and Mineral Engineering Building
    Minneapolis, MN  United States  55455-0220

    Federal Highway Administration

    Office of University Research, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Nelson, C R
    • Yardley, D H
    • Havrilak, RJJ
    • Miller, S M
  • Publication Date: 1975-7

Media Info

  • Pagination: 178 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00137299
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: DOT/TST-76/70
  • Contract Numbers: DOT-OS-40087
  • Files: TRIS, USDOT
  • Created Date: Sep 16 1977 12:00AM