Fiber optic sensing for geomechanical monitoring: (1)-distributed strain measurements of two sandstones under hydrostatic confining and pore pressure conditions

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Title: Fiber optic sensing for geomechanical monitoring: (1)-distributed strain measurements of two sandstones under hydrostatic confining and pore pressure conditions
Authors: Xue, Z
Shi, JQ
Yamauchi, Y
Durucan, S
Item Type: Journal Article
Abstract: In this study distributed optic fiber has been used to measure both the Rayleigh and Brillouin frequency shift of two different sandstone core samples under controlled hydrostatic confining and pore pressure in the laboratory. The Berea sandstone core is relatively homogeneous, whereas the Tako sandstone core is visibly heterogeneous with a coarse-grain and a fine-grain region. Rayleigh frequency has been found to have a superior performance over Brillouin frequency in terms of better consistency (less scattering) in the tests carried out. The strain gauge readings reveal considerable anisotropy in the stiffness of the Berea core between perpendicular (vertical) and parallel to the bedding (hoop) directions. The strains converted from Rayleigh frequency shift measurements agree reasonably well with readings by one of the four hoop strain gauge channels under increasing confining/pore pressure. For the Tako sandstone core, the contrast in the grain-size, and thus rock elastic properties, is clearly reflected in the hoop strain measurement by both strain gauges and distributed optic fiber. The outcomes of the test have demonstrated successfully the use of a single optic fiber for measuring rock strain response at different regions of a heterogeneous core sample along a continuous trajectory.
Issue Date: 1-Nov-2018
Date of Acceptance: 28-Oct-2018
URI: http://hdl.handle.net/10044/1/64575
DOI: https://dx.doi.org/10.3390/app8112103
Publisher: MDPI
Journal / Book Title: Applied Sciences (Switzerland)
Volume: 8
Issue: 11
Copyright Statement: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Publication Status: Published
Online Publication Date: 2018-11-01
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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