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|Outbursts, or the sudden and sometimes catastrophic expulsion of coal and gas into the working area of a coal mine, are a little understood and growing problem. The AE/MS (Acoustic Emission/Microseismic), or rock talk, activity prior to and associated with several outbursts has been recorded using ultrasonic and micro- seismic equipment and has been analyzed by the Bureau of Mines. Analysis of these data indicates that outbursts are comprised of several failures in rapid succession and that anomalous AE/MS data suitable for providing failure warning are generated 15 to 45 minutes prior to the failure. This paper discusses the techniques for recording and analyzing these data and presents sane case histories.|
Additional chapters/articles from the SME-ICGCM book Proceedings Second Conference On Ground Control In Mining
|A New Approach To The Design Of Multi-Entry Developments For||Manifestation Of Mine Pressure And Its Relations To Overlyin||Geotechnical Investigation For A Single Entry Design For Lon||Roof Falls And Caving In Longwall Mining Operations||Support Resistance And Roof Behaviour Of A Longwall Face Wit||State Of The Art Testing Of Powered Roof Supports||Some Structural Aspects Of Designing The Shield Supports||Design Considerations For Angle Bolters||Machine Design Parameters For High Seam Truss Bolting Applic||Design Trade-Off For Angle Roof Drilling||Hydraulic Tensioning Of A Birmingham Roof Truss||Current Trends In Roof Truss Hardware||The Search For A Method To Provide Warning Of Coal And Gas O||Methods Used To Monitor Roof Geology And Entry Supports||A Method For Estimating Western Coal Strengths From Point Lo||Coping With High Lateral Stresses In An Underground Illinois||Alternatives For Controlling Cutter Roof In Coal Mines||Remote Sensing Techniques In Mine Planning - Applications An||The Use Of A Graphic Mini-Computer System As A Rock Mechanic||Greater Safety With Increased Productivity Coal Mining Opera||Critical Roof Span Approach To Selection Of Proper Coal Mine||Roof Bolt Bond Tester; A Device For Nondestructive Testing O||Remote Control Roof Bolting||Development Cooperation Between Operator And Manufacturer -||Research, Development, And Use Of Steel-Fiber-Reinforced Con||TV Borehole Inspection And Vacuum Testing Of Roof Strata||Use Of Automated Resistivity System To Locate Potential Subs||Control Of Mine Subsidence Utilizing Coal Ash As A Backfill||Surface Flooding-Considerations For Mining Facilities Site S||The Formation And Effects Of Transient Abutment Stress Durin||Some Technical Considerations When Mining Under Bodies Of Wa|