On the elastic anatomy of heterogeneous fractures in rock
This study examines the feasibility of the full-field ultrasonic characterization of fractures in rock. To this end, a slab-like specimen of granite is subjected to in-plane, O(104 Hz) excitation while monitoring the induced 2D wavefield by a Scanning Laser Doppler Vibrometer (SLDV) with sub-centime...
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Published in | International journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 106; pp. 259 - 268 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Berlin
Elsevier Ltd
01.06.2018
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | This study examines the feasibility of the full-field ultrasonic characterization of fractures in rock. To this end, a slab-like specimen of granite is subjected to in-plane, O(104 Hz) excitation while monitoring the induced 2D wavefield by a Scanning Laser Doppler Vibrometer (SLDV) with sub-centimeter spatial resolution. Upon suitable filtering and interpolation, the observed wavefield is verified to conform with the plane-stress approximation and used to: (i) compute the maps of elastic modulus in the specimen (before and after fracturing) via a rudimentary application of the principle of elastography; (ii) reconstruct the fracture geometry; (iii) expose the fracture's primal (traction-displacement jump) contact behavior, and (iv) identify its profiles of shear and normal specific stiffness. Through the use of full-field ultrasonic data, the approach provides an unobscured, high-resolution insight into the fracture's contact behavior, foreshadowing in-depth laboratory exploration of interdependencies between the fracture geometry, aperture, interphase properties, and its seismic characteristics. |
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ISSN: | 1365-1609 1873-4545 |
DOI: | 10.1016/j.ijrmms.2018.04.011 |