A simple approach to the problem of roof stability of shallow tunnels based upon the nature of frequently observed failures is proposed. Using the principal stress trajectories and the failure criteria respectively for the rock mass and discontinuities, the ground pressures acting upon a tunnel are evaluated for three typical geological situations: isotropic, stratified and cross-jointed rock. The paramount importance of the value of joint friction is clearly demonstrated. The optimal shape of the tunnel roof defined by the major principal stress trajectories-and criteria for the tunnel roof being self- supporting are given for the three mentioned cases. The number of the covering abstract of the congress is TRIS no. 385148. (Author/TRRL)

  • Availability:
  • Supplemental Notes:
    • This paper was presented at the Fifth International Congress on Rock Mechanics, Melbourne, Australia, 1983, Volume 2, Theme C.
  • Corporate Authors:

    AA Balkema

    P.O. Box 1675
    Rotterdam,   Netherlands  BR-3000

    Australasian Institute of Mining and Metallurgy

    204 Lygon Street
    Carlton, Victoria  Australia  3053
  • Authors:
    • EGGER, P
  • Publication Date: 1983

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Filing Info

  • Accession Number: 00385198
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 90 6191 237 7
  • Report/Paper Numbers: BOOK
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jun 28 1984 12:00AM