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

SYSNO ASEP	0462327
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	In situ stress determination from excavation-induced stress by the compact conical-ended borehole overcoring method
Author(s)	Hastíková, Alice (UGN-S) Kolcun, Alexej (UGN-S)_RID Staš, Lubomír (UGN-S)_{RID, ORCID} Koníček, Petr (UGN-S)_{RID, ORCID}
Number of authors	4
Source Title	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
Pages	s. 1203-1206
Number of pages	4 s.
Publication form	Print - P
Action	EUROCK 2016 - 2016 ISRM International Symposium
Event date	29.08.2016 - 31.08.2016
VEvent location	Cappadocia
Country	TR - Turkey
Event type	WRD
Language	eng - English
Country	GB - United Kingdom
Keywords	in situ stress determination ; excavation-induced stress ; compact conical-ended borehole overcoring method (CCBO instrument)
Subject RIV	DH - Mining, incl. Coal Mining
OECD category	Mining and mineral processing
R&D Projects	LO1406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	ED2.1.00/03.0082 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Institutional support	UGN-S - RVO:68145535
UT WOS	000719660400085
EID SCOPUS	85001837225
Annotation	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.
Workplace	Institute of Geonics
Contact	Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354
Year of Publishing	2017

Number of the records: 1