Grouting in tunnels is intended to stop water leakage or to reinforce the rock. The type of grout should be adapted to the job, and one may use solutions, emulsions or suspensions. Grouting against water leakage in existing road tunnels has been performed by Lignin Sulphite solution which gelatinates when potassium bichromate is added. The viscosity increases gradually while injecting but the gel time may be controlled by the concentration of potassium bichromate and the accelerator ferric chloride. When water is added after hardening, the gel swells a little, this often improves the sealing. Pump and injection pipe packers are important parts of the grouting equipment. The pump has to ensure adequate and stable grout pressure and the injection pipe must have an exapnding collar to seal against the drill hole wall. Results have been good where rock fissures are few and relatively open. Where rock is very fractured and the fissures are closed it is very difficult to obtain a good result. ;Author; result. /Author/

  • Corporate Authors:

    Norwegian Road Research Laboratory

    Postboks 8109, Gaustadalleen 25
    Oslo,   Norway 
  • Authors:
    • Brenna, E
  • Publication Date: 1975-9


  • Norwegian

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00131562
  • Record Type: Publication
  • Report/Paper Numbers: No. 48
  • Files: TRIS
  • Created Date: May 14 1976 12:00AM