FOAM GROUTING STABILISES OLD MINE WORKINGS

In an effort to arrest progressive caving of the underground workings of a disused iron ore mine that is being turned into an oil storage reservoir, special foam injection grouts were developed for filling the large cavities and covering the scree in the workings. Details are outlined of the mine and the method of ore extraction that was used. The method of grouting is detailed. This single grout had a liquid phase consisting mainly of sodium silicate and a gaseous phase (creating foam) resulting from the addition of a tensio-active material (teepol). An easily transportable grout that could be poured into place was developed. It had the property of setting as soon as its movement ceased, and expanding in volume by ratio of 1 to 2. The grout also had the ability to fill large voids without penetrating small ones. Throught the duration of the work, the grouts were carefully controlled during both production and placement, particularly with regard to density and swelling rate. At completion, checks were made to determine whether the grout had impregnated the rockfill beyond the specified limit, and to what extent the grout had actually expanded. The material used here could also be employed in filling large voids under old dams, and creating "cofferdams" between which a more penetrating (and costly) grout could later be applied, to create a cut-off in permeable formations without loss of grout outside the required area.

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Publication Date: 1975-3

Media Info

  • Features: Figures;
  • Pagination: p. 43-45
  • Serial:
    • GROUND ENGINEERING
    • Volume: 8
    • Issue Number: 2
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00097385
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM