Podrobnosti záznamu

    Experimental investigation of acoustic emissions and their moment tensors in rock during failure
    Aker, E.
    Kühn, D.
    Oye, V.
    Soldal, M.
    Vavryčuk, Václav
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    International Journal of Rock Mechanics and Mining Sciences
    Roč. 70, September
    s. 286-295
    Projekt: FP7 Consortium Project AIM 230669, European Commission, XE3cav_un_auth*0301878
    Projekt: GAP210/12/1491, GA ČR, CZ3cav_un_auth*0285048
    Rozsah: 10 s. : P
Předmětová kategorie
    acoustic emissions
    focal mechanisms
    hoop stresses
    laboratory experiment
    moment tensors
    rock fracturing
Klíčové slovo
Abstrakt (anglicky)
   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.
    AV ČR Brno, Geofyzikální ústav
Kód přispěvatele
    AV ČR, GFÚ
Zdrojový formát
Datum importu
    23. 10. 2014