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

Lars Jacobsson, Gunnar Kjell, Risto Kiuru, Johannes Suikkanen

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

12 Lataukset (Pure)

Abstrakti

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.
AlkuperäiskieliEnglanti
OtsikkoRock Mechanics for Natural Resources and Infrastructure Development - full papers
AlaotsikkoProceedings of the 14th International Congress on Rock Mechanics and Rock Engineering (ISRM 2019), September 13-18, 2019, Foz do Iguassu, Brazil
ToimittajatSergio A. B. da Fontoura, Ricardo José Rocca, José Félix Pavón Mendoza
Sivut1638-1645
Sivumäärä8
ISBN (elektroninen)978-0-367-82317-7
TilaJulkaistu - 3 syyskuuta 2019
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaISRM International Congress on Rock Mechanics and Rock Engineering - Bourbon Cataratas Convention & Spa Resort, Iguassu Falls, Brasilia
Kesto: 13 syyskuuta 201918 syyskuuta 2019
Konferenssinumero: 14
http://www.isrm2019.com/

Julkaisusarja

NimiProceedings in Earth and geosciences series
Vuosikerta6
ISSN (painettu)2639-7749
ISSN (elektroninen)2639-7757

Conference

ConferenceISRM International Congress on Rock Mechanics and Rock Engineering
LyhennettäISRM
Maa/AlueBrasilia
KaupunkiIguassu Falls
Ajanjakso13/09/201918/09/2019
www-osoite

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