Počet záznamů: 1

In situ stress determination from excavation-induced stress by the compact\nconical-ended borehole overcoring method

  1. 1.
    0462327 - UGN-S 2017 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
    Hastíková, Alice - Kolcun, Alexej - Staš, Lubomír - Koníček, Petr
    In situ stress determination from excavation-induced stress by the compact
    conical-ended borehole overcoring method.
    Rock Mechanics and Rock Engineering: From the Past to the Future. London: CRC Press, Taylor and Francis Group, 2016 - (Ulusay, R.; Aydan, Ö.; Gercek, A.; Hindistan, H.; Tuncay, E.), s. 1203-1206. Volume 2. ISBN 978-1-138-03265-1.
    [EUROCK 2016 - 2016 ISRM International Symposium. Cappadocia (TR), 29.08.2016-31.08.2016]
    Grant CEP: GA MŠk(CZ) LO1406; GA MŠk ED2.1.00/03.0082
    Institucionální podpora: RVO:68145535
    Klíčová slova: in situ stress determination * excavation-induced stress * compact conical-ended borehole overcoring method (CCBO instrument)
    Kód oboru RIV: DH - Báňský průmysl vč. těžby a zpracování uhlí

    The Compact Conical Borehole Overcoring (CCBO) method originally developed in Japan to
    determine stress in rock has been widely used by the Institute of Geonics, Czech Academy of Sciences. Only one
    borehole is required to install the CCBO instrument, measure strains and determine the full stress tensor in rock
    mass. To determine the pre-mining stress around the circular tunnel in undisturbed hard rock, the measurement
    requires a borehole of certain length to install the CCBO cell in location where the excavation does not affect the
    stress field.To reduce the drilling and installation costs, the Institute is developing new theoretical solutions for a
    short borehole strain measurement method enabling the CCBO cell installation closer to the circular tunnel. The
    proposed semi-analytical approach uses the short borehole strain measurement results, theoretical calculations of
    stress distribution in the elastic medium around the circular tunnel and numerical modelling, to back analyze the
    probable pre-mining stress tensor. This approach enables determination of pre-mining stress obtained from the
    short borehole strain measurements in excavation-induced zone around underground opening. Discussed here
    are the theoretical calculation methods, numerical modelling results and a practical example of the pre-mining
    stress determination from the short borehole strain measurements using the CCBO instrument.
    Trvalý link: http://hdl.handle.net/11104/0261800
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