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In situ stress determination from excavation-induced stress by the compact conical-ended borehole overcoring method
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SYSNO ASEP 0462327 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název In situ stress determination from excavation-induced stress by the compact conical-ended borehole overcoring method Tvůrce(i) Hastíková, Alice (UGN-S)
Kolcun, Alexej (UGN-S) RID
Staš, Lubomír (UGN-S) RID, ORCID
Koníček, Petr (UGN-S) RID, ORCIDCelkový počet autorů 4 Zdroj.dok. Rock Mechanics and Rock Engineering: From the Past to the Future, Proceedings of the 2016 ISRM International Symposium, EUROCK 2016. - London : CRC Press, Taylor and Francis Group, 2016 / Ulusay R. ; Aydan Ö. ; Gercek A. ; Hindistan H. A. ; Tuncay E. - ISBN 978-1-138-03265-1 Rozsah stran s. 1203-1206 Poč.str. 4 s. Forma vydání Tištěná - P Akce EUROCK 2016 - 2016 ISRM International Symposium Datum konání 29.08.2016 - 31.08.2016 Místo konání Cappadocia Země TR - Turecko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova in situ stress determination ; excavation-induced stress ; compact conical-ended borehole overcoring method (CCBO instrument) Vědní obor RIV DH - Báňský průmysl vč. těžby a zpracování uhlí Obor OECD Mining and mineral processing CEP LO1406 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy ED2.1.00/03.0082 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UGN-S - RVO:68145535 UT WOS 000719660400085 EID SCOPUS 85001837225 Anotace 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.Pracoviště Ústav geoniky Kontakt Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Rok sběru 2017
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