Wave velocity measurements in three directions on axially loaded water-saturated granite and gneiss core specimens

Lars Jacobsson, Gunnar Kjell, Risto Kiuru, Johannes Suikkanen

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Abstract

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.
Original languageEnglish
Title of host publicationRock Mechanics for Natural Resources and Infrastructure Development - full papers
Subtitle of host publicationProceedings of the 14th International Congress on Rock Mechanics and Rock Engineering (ISRM 2019), September 13-18, 2019, Foz do Iguassu, Brazil
EditorsSergio A. B. da Fontoura, Ricardo José Rocca, José Félix Pavón Mendoza
Pages1638-1645
Number of pages8
ISBN (Electronic)978-0-367-82317-7
Publication statusPublished - 3 Sep 2019
MoE publication typeA4 Article in a conference publication
EventISRM International Congress on Rock Mechanics and Rock Engineering - Bourbon Cataratas Convention & Spa Resort, Iguassu Falls, Brazil
Duration: 13 Sep 201918 Sep 2019
Conference number: 14
http://www.isrm2019.com/

Publication series

NameProceedings in Earth and geosciences series
Volume6
ISSN (Print)2639-7749
ISSN (Electronic)2639-7757

Conference

ConferenceISRM International Congress on Rock Mechanics and Rock Engineering
Abbreviated titleISRM
CountryBrazil
CityIguassu Falls
Period13/09/201918/09/2019
Internet address

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    Cite this

    Jacobsson, L., Kjell, G., Kiuru, R., & Suikkanen, J. (2019). Wave velocity measurements in three directions on axially loaded water-saturated granite and gneiss core specimens. In S. A. B. da Fontoura, R. J. Rocca, & J. F. Pavón Mendoza (Eds.), Rock Mechanics for Natural Resources and Infrastructure Development - full papers: Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering (ISRM 2019), September 13-18, 2019, Foz do Iguassu, Brazil (pp. 1638-1645). (Proceedings in Earth and geosciences series; Vol. 6).