SPRAY GROUTING. SUMMARY OF RESEARCH, DEVELOPMENT, UTILIZATION, AND FUTURE USES

A spray grouting technique has been developed for hardening a 1 to 6 inch surface layer of weak sandstones such as the St. Peter Sandstone in Minnesota. When used on tunnel walls and roof it provides temporary excavation support in larger tunnels and a permanent lining in smaller utility tunnels. This eliminates or reduces the need for more costly conventional support. The research and development has cost about $100,000 in RANN funds and $50,000 of industry user funds. The technique is now being used in an 8000 foot long storm water tunnel and in a 6500 foot long utility tunnel. The estimated savings from the use of the new method is $1,300,000 on these two projects. Increased use of the method is expected.

• Corporate Authors:

  University of Minnesota, Minneapolis

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

  National Science Foundation

  Research Applied to National Needs
  Washington, DC  United States  20550
• Authors:
  • Nelson, C R
• Publication Date: 1975-12-8

Media Info

• Pagination: 8 p.

Subject/Index Terms

• TRT Terms: Chemical sprays; Coatings; Excavation and tunneling; Grouting; Rockbolts; Sandstones; Tunnel lining; Tunnel supports; Tunnels; Underground structures
• Geographic Terms: Minnesota
• Old TRIS Terms: Underground supporting
• Subject Areas: Bridges and other structures; Construction; Highways;

Filing Info

• Accession Number: 00137160
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NSF/RA/T-75/073
• Contract Numbers: NSF-GI-37862
• Files: TRIS
• Created Date: Sep 4 1976 12:00AM