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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Bibliographic Details
Published inInternational journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 106; pp. 259 - 268
Main Authors Pourahmadian, Fatemeh, Guzina, Bojan B.
Format Journal Article
LanguageEnglish
Published Berlin Elsevier Ltd 01.06.2018
Elsevier BV
Subjects
Data processing
Exploratory behavior
Feasibility studies
Filtration
Fracture mechanics
Fractures
Full-field ultrasonic sensing
Heterogeneous specific stiffness
Interpolation
Materials elasticity
Mechanical properties
Modulus of elasticity
Rocks
Seismic behavior of fractures
Seismic engineering
Spatial discrimination
Spatial resolution
Stiffness
Ultrasonic imaging
Vibration meters
Seismic behavior of fractures
Heterogeneous specific stiffness
Full-field ultrasonic sensing
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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.
ISSN:1365-1609
1873-4545
DOI:10.1016/j.ijrmms.2018.04.011