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Acoustic Emission Monitoring of Dump Points.

PB92176924

Publication Date	1992
Personal Author	Aldinger, J. A.
Page Count	80
Abstract	The U.S. Bureau of Mines investigated the feasibility of acoustic emission monitoring as a means of determining the stability of dump points at mine stockpiles and waste dumps. The goal was to devise a dump point stability monitoring methodology using inexpensive hardware and simple, straightforward analytical procedures. A small scale test facility was constructed for testing model dump points, with loading provided by a caster mounted on a shaft which moved both vertically and horizontally. The acoustic emissions generated in the soil were picked up by piezoelectric accelerometers. The acceleration data were analyzed for amplitudes, ring-down count rates, energy rates and frequency spectra. Stationary load tests were conducted on stable and unstable slopes. The results of dynamic load tests simulating a truck backing to the slope edge were dependent on waveguide location. Most of the waves detected by the transducers originated from tire and soil surface interaction. Since that noise could not be differentiated from slope instability, the goal of the study was not achieved. Although beyond the scope of the study, the use of more extensive instrumentation and signal processing may enable differentiation of acoustic emissions caused by tires versus slopes, thereby permitting unstable slope identification.
Keywords	Mine haulage Acoustic measurement Surface mining Slopes Waste disposal Tire noise Vehicle noise Loads(Forces) Monitoring Stability Signal processing
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Bureau of Mines, Minneapolis, MN. Twin Cities Research Center.
Document Type	Technical Report
Title Note	Open file rept. (Final).
NTIS Issue Number	199214

Acoustic Emission Monitoring of Dump Points.

Acoustic Emission Monitoring of Dump Points.
PB92176924

Publication Date	1992
Personal Author	Aldinger, J. A.
Page Count	80
Abstract	The U.S. Bureau of Mines investigated the feasibility of acoustic emission monitoring as a means of determining the stability of dump points at mine stockpiles and waste dumps. The goal was to devise a dump point stability monitoring methodology using inexpensive hardware and simple, straightforward analytical procedures. A small scale test facility was constructed for testing model dump points, with loading provided by a caster mounted on a shaft which moved both vertically and horizontally. The acoustic emissions generated in the soil were picked up by piezoelectric accelerometers. The acceleration data were analyzed for amplitudes, ring-down count rates, energy rates and frequency spectra. Stationary load tests were conducted on stable and unstable slopes. The results of dynamic load tests simulating a truck backing to the slope edge were dependent on waveguide location. Most of the waves detected by the transducers originated from tire and soil surface interaction. Since that noise could not be differentiated from slope instability, the goal of the study was not achieved. Although beyond the scope of the study, the use of more extensive instrumentation and signal processing may enable differentiation of acoustic emissions caused by tires versus slopes, thereby permitting unstable slope identification.
Keywords	Mine haulage Acoustic measurement Surface mining Slopes Waste disposal Tire noise Vehicle noise Loads(Forces) Monitoring Stability Signal processing
Source Agency	Bureau of Mines
NTIS Subject Category	48A - Mineral Industries
Corporate Authors	Bureau of Mines, Minneapolis, MN. Twin Cities Research Center.
Document Type	Technical Report
Title Note	Open file rept. (Final).
NTIS Issue Number	199214