CONSIDERATIONS OF ROCK STRESSES AND THEIR EFFECT ON THE CONSTRUCTION OF TUNNELS AND UNDERGROUND CAVERNS USING EXPLOSIVES

BETRACHTUNGEN UEBER GEBIRGSDRUCK UND DESSEN AUSWIRKUNG AUF DEN SPRENGVORTRIEB VON TUNNELN UND GROESSEREN HOHLRAEUMEN IN FELS

Relatively high residual stresses can be observed in the Permian granites and syenites around Oslo. These eruptive rocks are the youngest in a comprehensive series of igneous strata commencing with basaltic lavas and ending with several layers of rhombic porphyry. In many cases rock falls were observed in tunnels with shallow cover. These phenomena occur in tunnels with both large and small cross sections. On occasions special safety problems are associated with such states of stress. Where the stresses were small, it was possible to prevent rock falls by the application of 6 to 10 cm of Gunite. Where higher stresses occurred, the entire tunnel profile had to be lined with concrete, in some cases even with reinforced concrete. Where rock anchors were used, it was noted that abrupt stress gradients could not be relieved. Stresses of up to 950 kp/cm2 were measured. About 200 M of rock cover alone could not give rise to such high stresses. The observations indicate that the maximum principal stresses are parallel to the prevalent cleavage planes. /TRRL/

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  • Supplemental Notes:
    • This paper was presented at the Hans-Cloos Conference on Geomechanics, held 14th & 15th October, 1976, in Salzburg.
  • Corporate Authors:

    Springer Verlag

    175 5th Avenue
    New York, NY  United States  10010
  • Authors:
    • Heltzen, A M
  • Publication Date: 0

Language

  • German

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 133-137
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00300970
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • ISBN: 3-211-81435-3
  • Files: ITRD, TRIS
  • Created Date: Oct 17 1979 12:00AM