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Variations in Ultrasonic Signal Spectra for Triaxial Testing of Rock Samplesстатья
- Авторы: Shikhova NM, Patonin AV, Ponomarev AV, Smirnov VB
- Журнал: Izvestiya. Physics of the Solid Earth
- Том: 58
- Номер: 4
- Год издания: 2022
- Издательство: Pleiades Publishing, Inc.
- Местоположение издательства: New York, USA
- Первая страница: 591
- Последняя страница: 602
- Оригинальные версии: ИНИЦИАЦИЯ РАЗРУШЕНИЯ ГОРНЫХ ПОРОД ФЛЮИДАМИ РАЗНОЙ ВЯЗКОСТИ
- DOI: 10.1134/S1069351322040103
- Аннотация: Experiments on sandstone, basalt and granite were carried out on a controlled hydraulic pressunder triaxial loading conditions at confining pressure of 5, 10 and 15 MPa. The tests on sandstone and basaltwere conducted with the injection of a fluid (water) and subsequent modulation of pore-fluid pressure, andthe tests on granite were performed without fluid injection. In the experiments, both the acoustic emission(AE) signals arising during fracture of the material and the ultrasonic (U/S) sounding signals were recordedin 16 directions. Based on the U/S data, a change in the power spectra of recorded U/S signals is revealed atdifferent stages of sample testing. It is shown that the changes in the median of the power spectrum of U/Ssignals (median frequency fmed) can reach more than 100% depending on the degree of fracture in a rock;besides, compared to elastic velocities, the changes in the spectral content of the U/S signals more dynamicallyreflect fracture development in samples. The dependence of median frequency on applied axial load isestablished. It is shown that at fluid injection into a dry sample, fmed shifts strongly towards the low frequencies.The shift of individual spectral components of the U/S signals can be considered as an indicator ofchanges occurring in the sample. A decline in fmed testifies to the increasing degree of fracture of the material.The effect is most pronounced in highly porous sandstones.
- Добавил в систему: Смирнов Владимир Борисович