SOME PROBLEMS OF ROCK MECHANICS POSED BY THE MONT BLANC TUNNEL

THE CENTRAL BRIDGES AND HIGHWAYS LABORATORY HAS HAD THE OPPORTUNITY OF STUDYING THE ROBLEMS THAT CAME TO LIGHT DURING THE TUNNELLING OF MONT BLANC, IN PARTICULAR THE PHENOMENA OF DECOMPRESSION OF THE ROCKY MASS WHICH INVOLVED A VERY COSTLY BOLTING OF THE VAULT. THESE INVESTIGATIONS MADE IT POSSIBLE TO STUDY THE INITIAL STRESSES IN THE ROCKY MASS AND THE DEPTH OF THE AREA FRACTURED BY DECOMPRESSION. LABORATORY STUDIES SUPPLEMENTED THE MEASUREMENS IN SITU. MEASUREMENTS TAKEN IN THE COATING LEAD TO THE CONCLUSION THAT THE LINING IS PRACTICALLY NOT STRAINED BY THE ROCKY MASS; THE CRACKS THAT APPEARED MUST BE ATTRIBUTED TO THE HYGROMETRIC SHRINKAGE OF THE CONCRETE OR, MORE PORBABLY, TO THE THERMAL STRESSES CREATED BY THE COLD AIR CURRENT THAT BLOWS INTO THE TUNNEL. /AUTHOR/

  • Supplemental Notes:
    • No 264, pp 1951-1988
  • Authors:
    • Panet, M
  • Publication Date: 1969-12

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Filing Info

  • Accession Number: 00235632
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 4 1970 12:00AM