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Laboratory measurement of elastic anisotropy on spherical rock samples by longitudinal and transverse sounding under confining pressure
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SYSNO ASEP 0435076 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Laboratory measurement of elastic anisotropy on spherical rock samples by longitudinal and transverse sounding under confining pressure Author(s) Lokajíček, Tomáš (GLU-S) RID, SAI, ORCID
Svitek, Tomáš (GLU-S) SAI, RIDSource Title Ultrasonics. - : Elsevier - ISSN 0041-624X
Roč. 56, February 2015 (2015), s. 294-302Number of pages 9 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords elastic anisotropy ; hydrostatic pressure ; ultrasonic sounding ; high pressure ; longitudinal and shear waves Subject RIV DB - Geology ; Mineralogy R&D Projects LH13102 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GAP104/12/0915 GA ČR - Czech Science Foundation (CSF) GA13-13967S GA ČR - Czech Science Foundation (CSF) Institutional support GLU-S - RVO:67985831 UT WOS 000345386000033 EID SCOPUS 84911969211 DOI 10.1016/j.ultras.2014.08.015 Annotation Knowledge of shear wave velocities in loaded rocks is important in describing elastic anisotropy. A new high-pressure measuring head was designed and constructed for longitudinal and traversal ultrasonic sounding of spherical rock samples in 132 independent directions under hydrostatic pressure up to 60 MPa. The velocity is measured using a pair of P-wave sensors and two pairs of S-wave sensors (T V /R V and T H /R H ) with perpendicular polarization. An isotropic glass sphere was used to calibrate the experimental setup. A fine-grained anisotropic quartzite sample was examined using the P- and S-wave ultrasonic sounding. Waveforms are recorded by pairs of T P /R P ,T V /R V and T H /R H transducers in a range of confining pressure between 0.1 and 60 MPa. The recorded data showed a shear wave splitting in three basic structural directions of the sample. The measurements proved to be useful in investigating oriented micro-cracks, lattice (LPO) and shape-preferred orientation (SPO) for the bulk elastic anisotropy of aniso- tropic rocks subjected to hydrostatic pressure. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2016
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