Počet záznamů: 1
Experimental investigation of acoustic emissions and their moment tensors in rock during failure
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SYSNO ASEP 0430243 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Experimental investigation of acoustic emissions and their moment tensors in rock during failure Tvůrce(i) Aker, E. (NO)
Kühn, D. (NO)
Vavryčuk, Václav (GFU-E) ORCID, RID
Soldal, M. (NO)
Oye, V. (NO)Zdroj.dok. International Journal of Rock Mechanics and Mining Sciences. - : Elsevier - ISSN 1365-1609
Roč. 70, September (2014), s. 286-295Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova acoustic emissions ; focal mechanisms ; moment tensors ; rock fracturing ; hoop stresses ; laboratory experiment Vědní obor RIV DC - Seismologie, vulkanologie a struktura Země CEP GAP210/12/1491 GA ČR - Grantová agentura ČR Institucionální podpora GFU-E - RVO:67985530 UT WOS 000341365900029 DOI 10.1016/j.ijrmms.2014.05.003 Anotace 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. Pracoviště Geofyzikální ústav Kontakt Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Rok sběru 2015
Počet záznamů: 1