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Experimental investigation of acoustic emissions and their moment tensors in rock during failure
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SYSNO ASEP 0430243 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Experimental investigation of acoustic emissions and their moment tensors in rock during failure Author(s) Aker, E. (NO)
Kühn, D. (NO)
Vavryčuk, Václav (GFU-E) ORCID, RID
Soldal, M. (NO)
Oye, V. (NO)Source Title International Journal of Rock Mechanics and Mining Sciences. - : Elsevier - ISSN 1365-1609
Roč. 70, September (2014), s. 286-295Number of pages 10 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords acoustic emissions ; focal mechanisms ; moment tensors ; rock fracturing ; hoop stresses ; laboratory experiment Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects GAP210/12/1491 GA ČR - Czech Science Foundation (CSF) Institutional support GFU-E - RVO:67985530 UT WOS 000341365900029 DOI 10.1016/j.ijrmms.2014.05.003 Annotation We study acoustic emissions (AEs) associated with shear and tensile failures around a horizontal borehole in a sandstone sample subjected to triaxial stress. The aim is to relate the AE event rate to macroscopic observations of sample deformation and the percentage of isotropic and deviatoric components of the seismic moment tensors to the expected failure mechanisms. The horizontal hole interferes with the applied load and forms a strongly spatially dependent anisotropic stress fi eld, focusing the crack initiation into both shear and tensile failures. The recorded AEs follows reasonably well existing damage models, but the elastic solution of hoop stress does not represent the onset of failure around the borehole. The focal mechanisms correlate with the orientation of macroscopic fractures in the sample. Events close to the borehole show a higher fraction of isotropic percentage in moment tensors compared to events occurring in the macroscopic fracture featuring higher double-couple percentages. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2015
Number of the records: 1