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Evaluation of the Effect of Length on Strength of Slender Pillars in Limestone Mines Using Numerical Modeling
By Dennis Dolinar
In this National Institute for Occupational Safety and Health (NIOSH) investigation, numerical modeling is used to evaluate the degree the pillar strength is increased with a rectangular pillar over a
Jan 1, 2007
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Optimization of the Stress Control Method to Improve Productivity and Safety in Underground Coal Mining
By Shosei Serata
The Stress Control Method improves productivity and safety in underground coal mining. The method stabilizes the roofs and floors of mine openings in both shallow and deep coal beds, regardless of whe
Jan 1, 1986
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Coal Bumps And Odd Dynamic Phenomena - A Numerical Investigation (70cea8ce-38a7-4c88-a596-77cf801d31b0)
By Jeffrey K. Whyatt
The Crandall Canyon accident investigation included an interesting and unexplained observation by rescuers that the ?barrier rib had shifted northward as a unit, as much as 10 feet.? This is not the
Jan 1, 2009
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Successful Application of Rock Bolt Support and Mechanised Depillaring in Difficult Roof Conditions at Tandsi Mine, Western Coalfields, India
By D. C. Oldroyd
Western Coalfield?s Tandsi Mine, has difficult support conditions and a history of roof falls, resulting in mining roadway widths and depths being restricted for safety reasons. Rock Mechanics Technol
Jan 1, 2006
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State-Of-The-Art Room-And-Pillar Retreat Mining In The Kittanning Coalbed (6805422e-8080-42ac-9a3a-30ed4eeda62f)
By Alan A. Campoli
The U.S Bureau of Mines is conducting research to develop improved guidelines for selecting the type and pattern of roof support in different geologic environments (Mucho, et al., 1995). As a part of
Jan 1, 1996
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Rockburst Prevention in the German Coal Industry
By Rudiger Baltz
The sudden failure of bodies of rock is a serious problem commonly experienced in the international mining industry. These explosive releases of energy are referred-to as ?bumps?, ?outbursts? and ?roc
Jan 1, 2008
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Non-confirmation Mathematics for Wall Rock Classification for Mine Support
By Guangyi Sun
Wall rock classification method for coal mine support is the main factor affecting mine support. It is greatly affected by the combined effect of randomness, fuzziness and human being's incomplet
Jan 1, 2005
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Comparison Of Predictions And Measurements Of Subsidence Caused By Underground Mining In Northern Appalachia
By H. J. Siriwardane
This paper presents results from three case studies involving longwall mine panels at which the measured ground movements were compared with the numerical model predictions based on the finite element
Jan 1, 1988
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Practical Aspects Of Mobile Roof Support Usage
By F. E. Chase
Mobile roof supports are shield-type support units mounted on crawler tracks. Mobile roof support (MRS) units are used during retreat mining, and they eliminate the setting of roadway, turn, and cross
Jan 1, 1996
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A Management System to Develop Occupational Health & Safety in Ground Control Operations of Underground Mines
By Kazem Oraee
Falls of ground have historically been the main cause for fatalities in underground mines. Although recent advances in technology have reduced the number of such accidents, when failures occur they us
Jan 1, 2012
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Using Ground Penetrating Radar For Roof Hazard Detection In Underground Mines
By G. M. Molinda
Ground Penetrating Radar (GPR) is being investigated for the potential to determine roof hazards in underground mines. GPR surveys were conducted at four field sites with accompanying ground truth in
Jan 1, 1996
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Innovative Tailgate Support For Heavy Ground: 11 Left Longwall Panel, Cyprus Shoshone Mine
By Christopher C. Woomer
Cyprus Shoshone Mine uses the longwall method to extract a deep, thick, pitching coal seam in the Hanna Basin of South Central Wyoming. The immediate, and main roof rock consists of weak, thinly-bedde
Jan 1, 1995
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Developments of a Prototype Borehole Profilometer to Estimate Roof-Bolt Anchorage Capacity from Borehole Roughness Measurements-Laboratory Tests
By Mark K. Larson
Researchers at the National Institute for Occupational Safety and Health?s (NIOSH) Spokane Research Laboratory are developing a borehole profilometer to dynamically measure the roughness pro-file of b
Jan 1, 2007
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Three-Seam Stress Analyses at Bowie Mines, Colorado
By Hamid Maleki
In this paper, the authors present a review of data gathering programs and stress analyses for improving mine layout designs at BRL mines located near Paonia, Colorado. BRL and other companies have
Jan 1, 2007
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Load Determination For Long Cable Bolt Support Using Computer Aided Bolt Load Estimation (CABLE) Program
In this paper a numerical formulation is presented for determination of the axial load along a cable bolt for a prescribed distribution of rock mass displacement. Results using the program CABLE indic
Jan 1, 1996
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Evaluating Coal Pillar Mechanics Through Field Measurements (a8e6d7f0-5b83-40bc-b63c-ddaae2b3a526)
By Anthony Iannacchione
Designing coal pillars to provide resistance against overburden loads has long been an aim of rock mechanics engineers. The need for accurate pillar strength models has become more urgent as greater o
Jan 1, 1992
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Roof Screening for Underground Coal Mines: Recent Developments (45f180e8-0601-41d7-bc8b-2e9de87bd46d)
By Craig Compton
Falls of small pieces of rock from between roof bolts continue to cause fatalities and to injure hundreds of coal miners each year. Roof screen is the most effective way to prevent these incidents,
Jan 1, 2007
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Relationship Between Floor Rock Stress And Floor Failure
By X. S. Tan
This paper deals with the analysis of stress condition on the interface between two types of floor rock materials when the vertical stress is larger, or when the horizontal stress is larger in a recta
Jan 1, 1990
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Characterization of Internal Insertion Pressure During Installation of Fully Grouted Bolts
By Luis Giraldo
The installation procedure of fully grouted rebar bolts requires that the bolt be pushed through the resin grout until it is fully inserted in the borehole. Resin grout is a highly viscous fluid that
Jan 1, 2006
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Roof Pressure Monitoring Using The Integrated Longwalt Automation System By WESTFALIA
By Ulrich Paschedag
The WESTFALIA group of companies developer and manufactures underground mining machinery for complete high-performance longwalls. WESTFALIA uses a state of the art electrohydraulic system as the most
Jan 1, 1994