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Wave velocity measurements in three directions on axially loaded water-saturated granite and gneiss core specimens
RISE - Research Institutes of Sweden, Safety and Transport, Safety.ORCID iD: 0000-0003-4526-4061
RISE - Research Institutes of Sweden, Safety and Transport, Safety.
Aalto University, Finland.
Posiva OY, Finland.
2019 (English)In: Proceedings of the 14th International congress on Rock Mechanics ans Rock Engineering (ISRM 2019), Foz do Iguassu, Brazil, 13-18 September 2019: Rock Mechanics for Natural Resources and Infrastructure Development / [ed] Sergio A.B. da Fontoura, Ricardo José Rocca, José Félix Pavón Mendoza, Leiden, The Netherlands: CRC Press, 2019, p. 1638-1645Conference paper, Published paper (Refereed)
Abstract [en]

The density, porosity and mechanical properties from uniaxial compression and Brazilian tests along with measurements of the P- and S-wave velocities in axial and two lateral directions at unloaded state and at increasing axial load were conducted on cylindrical cores of veined gneiss and granitic pegmatoid. The specimens were sampled close to a tunnel wall (0.1– 1.7 m depth) with the aim to find if there is an increasing amount of microcracks due to the excavation in a zone near the surface. Evidence of microcracks was found via the mechanical tests and the wave velocity measurements, due to increased mechanical stiffness and increasing wave velocities at loading. Anisotropy in in the gneiss specimens and also in the granitic pegmatoid was detected and measured via strain and wave velocity measurements. No clear evidence was found of increased amount of microcracks closer to the tunnel wall.

Place, publisher, year, edition, pages
Leiden, The Netherlands: CRC Press, 2019. p. 1638-1645
Series
Proceedings in Earth and Geosciences, ISSN 2639-7749, E-ISSN 2629-7757 ; Volume 6
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39951ISBN: 978-0-367-42284-4 (print)ISBN: 978-0-367-82317-7 (electronic)OAI: oai:DiVA.org:ri-39951DiVA, id: diva2:1353258
Conference
14th International congress on Rock Mechanics ans Rock Engineering (ISRM 2019), Foz do Iguassu, Brazil, 13-18 September 2019
Available from: 2019-09-22 Created: 2019-09-22 Last updated: 2019-10-14Bibliographically approved

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