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Title: Intersection Waves: INTERSECTION WAVES

Abstract

Intersections in a fracture network control the connectivity of the flow paths through rock. The long near-linear geometric nature of fractures makes them difficult to identify and characterize. We present a new type of elastic wave, an intersection wave, which travels along an intersection and is sensitive to the coupling between two orthogonal fractures that define the intersection. Group theory for C 2v and C 4v point groups predicts sets of propagating elastic waves confined to the fracture intersection. Along with the use of the wave equation and displacement discontinuity boundary conditions, the dispersion relationships for intersection waves are predicted. Experimental ultrasonic measurements on a nonwelded linear intersection between two orthogonal, synthetic fractures in aluminum confirm the existence of multiple modes that travel between the speed of wedge waves (sub-Rayleigh waves) when the intersection is completely, and bulk shear waves, when the intersection is closed, as predicted by theory. Between these two limits, the intersection behaves as a nonwelded contact and yields these new intersection waves that are dispersive and sensitive to the coupling along the intersection. Intersection waves provide the foundation for new geophysical approaches for characterizing the hydraulic connectivity of fracture networks.

Authors:
 [1];  [1];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1537314
Grant/Contract Number:  
SC0001048
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 122; Journal Issue: 10; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geochemistry & Geophysics

Citation Formats

Abell, B. C., Nolte, D. D., and Pyrak-Nolte, L. J. Intersection Waves: INTERSECTION WAVES. United States: N. p., 2017. Web. doi:10.1002/2017jb014289.
Abell, B. C., Nolte, D. D., & Pyrak-Nolte, L. J. Intersection Waves: INTERSECTION WAVES. United States. doi:10.1002/2017jb014289.
Abell, B. C., Nolte, D. D., and Pyrak-Nolte, L. J. Mon . "Intersection Waves: INTERSECTION WAVES". United States. doi:10.1002/2017jb014289. https://www.osti.gov/servlets/purl/1537314.
@article{osti_1537314,
title = {Intersection Waves: INTERSECTION WAVES},
author = {Abell, B. C. and Nolte, D. D. and Pyrak-Nolte, L. J.},
abstractNote = {Intersections in a fracture network control the connectivity of the flow paths through rock. The long near-linear geometric nature of fractures makes them difficult to identify and characterize. We present a new type of elastic wave, an intersection wave, which travels along an intersection and is sensitive to the coupling between two orthogonal fractures that define the intersection. Group theory for C2v and C4v point groups predicts sets of propagating elastic waves confined to the fracture intersection. Along with the use of the wave equation and displacement discontinuity boundary conditions, the dispersion relationships for intersection waves are predicted. Experimental ultrasonic measurements on a nonwelded linear intersection between two orthogonal, synthetic fractures in aluminum confirm the existence of multiple modes that travel between the speed of wedge waves (sub-Rayleigh waves) when the intersection is completely, and bulk shear waves, when the intersection is closed, as predicted by theory. Between these two limits, the intersection behaves as a nonwelded contact and yields these new intersection waves that are dispersive and sensitive to the coupling along the intersection. Intersection waves provide the foundation for new geophysical approaches for characterizing the hydraulic connectivity of fracture networks.},
doi = {10.1002/2017jb014289},
journal = {Journal of Geophysical Research. Solid Earth},
number = 10,
volume = 122,
place = {United States},
year = {2017},
month = {8}
}

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