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Title: High resolution monitoring of strain fields in concrete during hydraulic fracturing processes

Here, we present a distributed fiber optic sensing scheme to image 3D strain fields inside concrete blocks during laboratory-scale hydraulic fracturing. Strain fields were measured by optical fibers embedded during casting of the concrete blocks. The axial strain profile along the optical fiber was interrogated by the in-fiber Rayleigh backscattering with 1-cm spatial resolution using optical frequency domain reflectometry (OFDR). The 3D strain fields inside the cubes under various driving pressures and pumping schedules were measured and used to characterize the location, shape, and growth rate of the hydraulic fractures. The fiber optic sensor detection method presented in this paper provides scientists and engineers an unique laboratory tool to understand the hydraulic fracturing processes via internal, 3D strain measurements with the potential to ascertain mechanisms related to crack growth and its associated damage of the surrounding material as well as poromechanically-coupled mechanisms driven by fluid diffusion from the crack into the permeable matrix of concrete specimens.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  2. Corning Inc., New York, NY (United States)
Publication Date:
Grant/Contract Number:
FE0003859
Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 24; Journal Issue: 4; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Univ. of Pittsburgh, Pittsburgh, PA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; fiber optics sensors; pressure measurement; scattering Rayleigh
OSTI Identifier:
1238209
Alternate Identifier(s):
OSTI ID: 1253358