SCALE EFFECTS ON UNDERGROUND EXCAVATIONS . PROCEEDINGS OF THE FIRST INTERNATIONAL WORKSHOP ON SCALE EFFECTS IN ROCK MASSES, LOEN, NORWAY, JUNE 7-8 1990

Empirically many engineers fear that large underground openings have more difficult problems than small ones, but many existing mechanical calculations cannot meet these fears. Here the author proposes three components of scale effects to reveal their fear: (1) Scale effects on stress distribution. Continuum approximation mechanics are presented which can introduce the effects of microscopically unhomogeneous in materials, and which can be taken into consideration with scale effects on stress distribution; (2) Scale effects on strength of rock, rock mass and supporting members. Strength of brittle materials varies according to the principle of weakest link theory, namely, the strength decreases with the increase of the volume. Surrounding rock reinforced by anchor bolts and shotcrete is not merely brittle material, however, and therefore modification of the theory is required; (3) Scale effects depend on the influence of a different excavating sequence according to the tunnel scale. The excavation sequences influence on stress rearrangement or concentration on surrounding ground and supporting members. (Author/TRRL)

  • Availability:
  • Corporate Authors:

    AA Balkema

    P.O. Box 1675
    Rotterdam,   Netherlands  BR-3000
  • Authors:
    • FUKUSHIMA, K
  • Publication Date: 1990

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00609540
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 90-6191-660-7
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1991 12:00AM