Abstract
The purpose of this experimental study was to test the application of ultrasonic reflection techniques in the detection of discontinuities or fractures in crystalline rocks. Experience, confirming theory, showed that P wave reflections in the frequency range required and with source(s) and receiver(s) on the same surface were difficult to observe due to undesired source resonances and/or strong Rayleigh waves. In contrast, S H wave reflections are relatively easy to observe and offer superior detection properties with respect to fluid-filled, thin fractures. However, for maximum information, use of both wave type is necessary. Modern data processing techniques were applied to the reflection data, since the recording equipment allowed easy digital sampling of the received waves. Deconvolution and directive array synthesis were found to be the most effective techniques. The system which evolved was tested on two laboratory models with positive results for detection of fractures to a depth of one-half meter. Work to date shows that the system is indeed applicable to the detection of certain fractures within a mining environment, although the depth of penetration will be limited to a few meters.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
