The relationships were studied between wave velocities, fracture frequency, aperture, moisture content, contact pressure at joints and so on, underground at 104 tunneling sites, on several sites at the ground surface, and in laboratory tests. By considering 'fracture frequency' as the main parameter, the practical relationship between seismic behavior and mechanical properties of rock mass has been established. In general the velocity ratio k, defined by the ratio of p-wave veolocity in-situ or through a cracked model to that of intact rock, and fracture frequency n, defined by the number of joints per meter, can be expressed by an equation n = 5.0/squares-4.0. Also an aperture wider than 1 mm and a decrease of contact pressure to less than 3 mpa markedly influence the seismic behavior of the rock mass. The number of the covering abstract of the congress is TRIS no. 385148. (Author/TRRL)

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  • Supplemental Notes:
    • This paper was presented at the Fifth International Congress on Rock Mechanics, Melbourne, Australia, 1983, Volume 1, Theme A.
  • 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:
    • Tanimoto, C
    • Ikeda, K
  • Publication Date: 1983

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Filing Info

  • Accession Number: 00385150
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 90 6191 237 7
  • Report/Paper Numbers: BOOK
  • Files: ITRD, TRIS, ATRI
  • Created Date: May 30 1984 12:00AM