Distributed Fiber Optics Measurements of Rock Deformation and Failure in Triaxial Tests

Salazar Vásquez, Antonio; Rabaiotti, Carlo; Germanovich, Leonid N.; Puzrin, Alexander M.

doi:10.1029/2022jb023997

Title: Distributed Fiber Optics Measurements of Rock Deformation and Failure in Triaxial Tests

Journal Article · 02 August 2022 · Journal of Geophysical Research. Solid Earth

DOI: https://doi.org/10.1029/2022jb023997 · OSTI ID:1978579

^[1]; Rabaiotti, Carlo ^[2]; Germanovich, Leonid N. ^[3]; Puzrin, Alexander M. ^[4]

Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Eastern Switzerland University of Applied Sciences (Switzerland); OSTI
Eastern Switzerland University of Applied Sciences (Switzerland)
Clemson Univ., SC (United States)
Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)

The implementation of distributed strain measurement methods in triaxial and uniaxial tests have demonstrated the development of strain localization, even at early stages. This implies that single point measurement methods are location dependent. The use of distributed methods is required not only to improve the interpreted constitutive parameters obtained from triaxial tests, but also to understand the implications of strain localization in the failure process. Here, this work uses optical fibers in triaxial tests. The developed distributed measurement method was implemented on granite, gabbro, and sandstone samples and tested under different confining pressures, reaching 200 MPa on the granite sample. Using a temporal resolution of 0.25 Hz and 5 mm of spatial resolution, the strain evolution at over 300 locations at the sample surface was measured during testing. When compared to point sensing methods, the use of optical fiber greatly increases the number of measurements at the surface of the sample, and their interpolation provides the entire deformation of the sample surface. In all the tests performed, strain localizations were revealed before failure. A three-dimensional interpretation of a test, combining an optical scan of the sample and the distributed measurements, show good correlation between the fractures and the strain localization.

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Research Organization:: Clemson Univ., SC (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0028292

OSTI ID:: 1978579

Journal Information:: Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 8 Vol. 127; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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