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

Lars Jacobsson; Gunnar Kjell; Risto Kiuru; Johannes Suikkanen

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

Lars Jacobsson, Gunnar Kjell, Risto Kiuru, Johannes Suikkanen

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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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 language	English
Title of host publication	Rock Mechanics for Natural Resources and Infrastructure Development - full papers
Subtitle of host publication	Proceedings of the 14th International Congress on Rock Mechanics and Rock Engineering (ISRM 2019), September 13-18, 2019, Foz do Iguassu, Brazil
Editors	Sergio A. B. da Fontoura, Ricardo José Rocca, José Félix Pavón Mendoza
Publisher	CRC Press
Pages	1638-1645
Number of pages	8
ISBN (Electronic)	978-0-367-82317-7
ISBN (Print)	978-0-367-42284-4
Publication status	Published - 3 Sept 2019
MoE publication type	A4 Conference publication
Event	ISRM International Congress on Rock Mechanics and Rock Engineering - Bourbon Cataratas Convention & Spa Resort, Iguassu Falls, Brazil Duration: 13 Sept 2019 → 18 Sept 2019 Conference number: 14 http://www.isrm2019.com/

Publication series

Name	Proceedings in Earth and geosciences series
Volume	6
ISSN (Print)	2639-7749
ISSN (Electronic)	2639-7757

Conference

Conference	ISRM International Congress on Rock Mechanics and Rock Engineering
Abbreviated title	ISRM
Country/Territory	Brazil
City	Iguassu Falls
Period	13/09/2019 → 18/09/2019
Internet address	http://www.isrm2019.com/

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ENG_Jacobsson_et_al_Wave_velocity_measurements_isrm2019Accepted author manuscript, 997 KB

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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). CRC Press.

Jacobsson, Lars ; Kjell, Gunnar ; Kiuru, Risto et al. / Wave velocity measurements in three directions on axially loaded water-saturated granite and gneiss core specimens. 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. editor / Sergio A. B. da Fontoura ; Ricardo José Rocca ; José Félix Pavón Mendoza. CRC Press, 2019. pp. 1638-1645 (Proceedings in Earth and geosciences series).

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

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.",

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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 SAB da Fontoura, RJ Rocca & JF 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. Proceedings in Earth and geosciences series, vol. 6, CRC Press, pp. 1638-1645, ISRM International Congress on Rock Mechanics and Rock Engineering, Iguassu Falls, Brazil, 13/09/2019.

Wave velocity measurements in three directions on axially loaded water-saturated granite and gneiss core specimens. / Jacobsson, Lars; Kjell, Gunnar; Kiuru, Risto et al.
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. ed. / Sergio A. B. da Fontoura; Ricardo José Rocca; José Félix Pavón Mendoza. CRC Press, 2019. p. 1638-1645 (Proceedings in Earth and geosciences series; Vol. 6).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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AU - Jacobsson, Lars

AU - Kjell, Gunnar

AU - Kiuru, Risto

AU - Suikkanen, Johannes

N1 - Conference code: 14

PY - 2019/9/3

Y1 - 2019/9/3

N2 - 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.

AB - 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.

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M3 - Conference article in proceedings

SN - 978-0-367-42284-4

T3 - Proceedings in Earth and geosciences series

SP - 1638

EP - 1645

BT - Rock Mechanics for Natural Resources and Infrastructure Development - full papers

A2 - da Fontoura, Sergio A. B.

A2 - Rocca, Ricardo José

A2 - Pavón Mendoza, José Félix

PB - CRC Press

T2 - ISRM International Congress on Rock Mechanics and Rock Engineering

Y2 - 13 September 2019 through 18 September 2019

ER -

Jacobsson L, Kjell G, Kiuru R, Suikkanen J. Wave velocity measurements in three directions on axially loaded water-saturated granite and gneiss core specimens. In da Fontoura SAB, Rocca RJ, Pavón Mendoza JF, editors, 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. CRC Press. 2019. p. 1638-1645. (Proceedings in Earth and geosciences series).

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

Abstract

Publication series

Conference

Access to Document

Other files and links

Fingerprint

GAGS: Geophysical and Geochemical Methods for Stope Design

ORMID: On-line Risk Management in Deep Mines

Cite this

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

Abstract

Publication series

Conference

Access to Document

Other files and links

Fingerprint

Projects

GAGS: Geophysical and Geochemical Methods for Stope Design

ORMID: On-line Risk Management in Deep Mines

Cite this