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Laboratory investigation of crack initiation on hourglass-shaped granite specimens
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0003-4526-4061
RISE - Research Institutes of Sweden, Built Environment, CBI Swedish Cement and Concrete Research Institute.
2018 (English)In: Geomechanics and Geodynamics of Rock Masses, Volume 1: Proceedings of the 2018 European Rock Mechanics Symposuim / [ed] Vladimir Litvinenko, London: CRC Press, 2018, p. 633-638Conference paper, Published paper (Refereed)
Abstract [en]

Laboratory experiments on axially compressed hourglass-shaped specimens of medium to coarse grained granite specimens were conducted. A tangential stress is generated in the circular notches which is intended to initiate surface spalling similar to what can be seen at circular openings in a rock mass. Specimens of three different sizes were tested with notch radii 98.4, 225 and 375 mm, which are equivalent to a hole diameter of 197, 450 and 750 mm. The spalling initiation and progress in the notches were monitored by acoustic emission and digital correlation measurements. From the acoustic emission measurements it could be seen that the tangential stress at spalling initiation decreased with increasing notch radius. Results from digital image correlation show how the surfaces in local zones in the notch were pushed outwards due to subsurface cracking parallel to the notch surface. Analyses of thin sections and polished slabs taken in the notch area showed that the cracking depth increased with increasing notch radius.

Place, publisher, year, edition, pages
London: CRC Press, 2018. p. 633-638
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33926ISBN: 9780429461774 (print)ISBN: 9780429867729 (electronic)OAI: oai:DiVA.org:ri-33926DiVA, id: diva2:1212630
Conference
EUROCK 2018, Saint Petersburg, Russia, 22-26 May, 2018
Available from: 2018-06-02 Created: 2018-06-02 Last updated: 2018-06-07Bibliographically approved

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