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Spalling Experiments on Large Hard Rock Specimens
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Bygg och Mekanik, Strukturer och Komponenter.ORCID iD: 0000-0003-4526-4061
RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
2015 (English)In: Rock Mechanics and Rock Engineering, ISSN 0723-2632, E-ISSN 1434-453X, Vol. 48, no 4, p. 1485-1503Article in journal (Refereed) Published
Abstract [en]

Specimens of coarse-grained Äspö diorite were axially compressed to observe stress-induced spalling. The specimens had a novel design characterized by two manufactured large radius notches on opposite sides. The tangential stress occurring in the notches aimed to represent the tangential loading around a circular opening. Fracture stages were monitored by acoustic emission measurements. Rock chips were formed similar to those found in situ, which indicates a similar fracture process. Slabs were cut out from the specimens and impregnated using a fluorescent material to visualize the cracks. The cracks were subsequently examined by the naked eye and by means of microscopy images, from which fracture paths could be identified and related to different minerals and their crystallographic orientations. The microscopy analyses showed how the stress field and the microstructure interact. Parallel cracks were formed 2–4 mm below the surface, sub-parallel to the direction of the maximum principal stress. The crack initiation, the roles of minerals such as feldspar, biotite and quartz and their grain boundaries and crystallographic directions are thoroughly studied and discussed in this paper. Scale effects, which relate to the stress gradient and microstructure, are discussed.

Place, publisher, year, edition, pages
2015. Vol. 48, no 4, p. 1485-1503
Keywords [en]
Crystalline rock, Spalling, Laboratory experiments, Microscopy analysis, Fractures
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6842DOI: 10.1007/s00603-014-0655-0Local ID: 23739OAI: oai:DiVA.org:ri-6842DiVA, id: diva2:964683
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2019-07-09Bibliographically approved

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Jacobsson, Lars

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