If you have access to OneMine as part of a member benefit, log in through your member association website for a seamless user experience.
|The U.S. Bureau of Mines has developed a method and device designed to detect lose rock material in underground mines. The technology is designed to be an aid to mine workers in detecting hazardous roof conditions in underground mines which can complement or replace the traditional roof sounding techniques where the miner relies on experience to determine whether rock conditions are sound. The leading cause of accidents and fatalities in underground mines is falls of lose rock pieces or rock slabs from the mine roof. The device is an electronic roof sounding device that acoustically determines the integrity of mine rock. In previous research the Bureau of Mines found that loose rock, when impacted, vibrates at a much lower frequency than intact rock material. A major problem in determining rock stability using this technique has been the repeatability of the matt signal. This difficulty baa been greatly reduced in the current design by measuring the power spectra contained in two separate frequency bands of the signal produced by striking the rock in question. The ratio of the energy contained in each band is computed. This process minimizes any striking force differences, producing accurate, repeatable results for solid rock as well as loose, drummy material. The prototype has been successfully- tested in a variety of underground environments including coal, uranium, molybdenum, silver and salt. The technology has been investigated by the U.S. Mine Health and Safety Administration and the Department of Energy for use in detecting detached tunnel lining areas in nuclear repositories. The paper will discuss the technique, applicable results, and future applications.|
Additional chapters/articles from the SME-ICGCM book Tenth International Conference on Ground Control in Mining Proceedings (ICGCM) 10th
|Practical Aspects Of Longwall Pillar Design||Assessment Of Underground Structural Design||Load And Convergence Measurements In Longwall Faces And Desi||A Model Of Shield-Strata Interaction And Its Implications Fo||Stability Of Interpanel-Pillar And Deformation Of Gateroad D||Use Of Polymer Grids For Longwall Shield Recovery||Methods Of Controlling Thick And Strong Roof In Longwall Min||Tensioned Point Anchor Resin System Versus Non-Tensioned Ful||Thrust Bolting: A New Innovation In Coal Mine Roof Support||An Alternative To A Manual Torque Check On Roof Bolts||Shear Bond Stresses Along Cable Bolts||An Underground Trial Of Cable Slings For Remedial Support Of||Mobile Roof Support For Retreat Mining||Application Of Time Domain Reflectometry To Ground Control||An Examination Of Energy Calculations Applied To Coal Bump P||Delineation Of Abandoned Workings With An In-Seam Seismic Me||Remote Detection Of Abandoned Mine Workings Using Radio Imag||Effects Of Surface Topography On The Stability Of Coal Mine||Site Characterization For Ultra-Close Multi-Seam Mining||Mining Under Rivers In Fuxin Coal Mines||Use Of Database In Ground Control To Identify Weightings And||Integrating Ground Control And Mine Site Data Through A Geog||Determination Of The Rock Strength From Portable Rock Tester||Mine-Wide Physical Property Trend Identification Using Porta||Subsidence Prediction In Illinois Coal Basin||Determination Of The Stopline Subsidence Profile Of Phalen 2||Evaluation Of Subsidence Parameters For Inclined Seams In UK||Measurement Of Structural Deformation And Tilt During Subsid||Drag Picks - Influence Of Tool Geometry And Angle Of Arrack||Roof Sounding Device - A Loose Rock Detector||Advanced Surveying Method For Measuring Roof Convergence||Geomechanical Substantiation Of Extraction Of Undermined Ore||Relationship Between Floor Rock Stress And Floor Failure||The Influence Of Geomining Parameters Over Stress Distributi||Finite Element Modeling Of Subsidence Induced By Underground||The Structural Response Of A Steel Lattice Transmission Towe|