Record details

    Alternative methods for RQD parameter determination
    Koníček, Petr
    Ptáček, Jiří
    Souček, Kamil
    Staš, Lubomír
    Vavro, Leona
    Vavro, Martin
    Waclawik, Petr
    5th International Colloquium on Geomechanics and Geophysics (24.06.2014-27.06.2014 : Ostravice, Karolínka, Česká republika)
Publication type
Source title - monograph
    5th International Colloquium on Geomechanics and Geophysics. GECO 2014. 5
    S. 53-54
    Autoři celkem: 7
    Projekt: ED2.1.00/03.0082, GA MŠk3cav_un_auth*0280791
    Rozsah: 2 s. : P
Subject category
    geotechnical monitoring
    rock fracturing
    rock mass classification
    rock quality designation (RQD
Abstract (in english)
   The Rock Quality Designation index (RQD) developed by Deere et al. [1] represents one of the basic parameters which enter into the calculation of rock mass quality by index rock mass classification systems RMR [2, 3] and Q [4]. The RQD is defined as the percentage of the sum of the lengths of intact core pieces longer than 100mm (4 inches) relative to the chosen length of evaluated drill core and originally, it was also defined for the purpose of rock mass quality classification. However, RQD is a single parameter value, which directionally depends on the borehole orientation towards the bedding or metamorphic foliation and reflects a rate of rock mass failure only stated on the basis of drill core fragmentation by discontinuities.
    AV ČR Brno, Ústav geoniky
Contributor code
    AV ČR, ÚG
Source format
Import date
    24. 10. 2014