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Using acoustic emission techniques an autonomous system was set up to monitor stability in underground mining works. At the same time, potentially unstable areas of mining works were defined. Laboratory tests, where an R-6-I transducer was used, showed the characteristics of acoustic emission (AE) of hard coal, thus helping to develop control equipment. After carrying out open pit field tests equipment was built for monitoring, amplifying and filtering AEs. No breakdowns of equipment were reported. AEs recorded in the tests were classified as a function of the lower boundary of the bottom fractal dimension I(ae) and its band width B(ae). Analysis of the information gathered shows that a drop in the AE fractal dimension below I(ae)-2B(ae) can mean there is a need for precautionary action. This drop occurs in coal seam blasting but not in headgate blasting or normal mining activities.

Additional information

Authors: GEOCONTROL SA, Geocontrol SA, Madrid (ES)
Bibliographic Reference: EUR 14608 ES (1993) 73 pp., MF, ECU 4
Availability: (2)
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