Real-time monitoring of heterogeneous fractures in rock: An experimental study

F. Pourahmadian, B. B. Guzina

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study investigates the elastic anatomy of fractures in rock using full wavefield measurements. In this spirit, a 3-step experimental campaign is pursued in a laboratory setting, namely: (1) full-field ultrasonic testing of the intact rock, (2) fracturing, and (3) ultrasonic interrogation of the fractured rock. Experiments are performed on a slab-like prismatic specimen of charcoal granite. The sample is illuminated under the plane stress condition, prior and posterior to fracturing, by a shear piezoelectric transducer at 10 and 30kHz. The (in-plane) velocity response of the rock is monitored via the 3D Scanning Laser Doppler Vibrometer over a rectangular region in the fracture neighborhood. Upon proper signal processing, (i) the maps of elastic modulus in the specimen (before and after fracturing) is computed via elastography, exposing the geometric and elastic properties of the process zone; (ii) the fracture geometry is reconstructed, and (iii) profiles of shear and normal specific stiffness at the fracture interface are identified.

Original languageEnglish (US)
Title of host publication51st US Rock Mechanics / Geomechanics Symposium 2017
PublisherAmerican Rock Mechanics Association (ARMA)
Pages1839-1845
Number of pages7
ISBN (Electronic)9781510857582
StatePublished - Jan 1 2017
Event51st US Rock Mechanics / Geomechanics Symposium 2017 - San Francisco, United States
Duration: Jun 25 2017Jun 28 2017

Publication series

Name51st US Rock Mechanics / Geomechanics Symposium 2017
Volume3

Other

Other51st US Rock Mechanics / Geomechanics Symposium 2017
CountryUnited States
CitySan Francisco
Period6/25/176/28/17

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