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Resin Annulus Size Effects On Rebar Bolt Pull Strength And Resin Loss To Fractured Rock
By Al Campoli
One of the critical variables affecting resin bolt performance is the size of the resin annulus, defined as the difference between the hole and bolt radius. The vast majority of the millions of resin
Jan 1, 1999
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Staubbekampfung An Schildausbau In Bruchbaustreben (Combating Dust On Shield Supports On Longwall Mining)
By Wilfried Ufer
[1. Einführung in die Problematik 1.1 Die Bedeutung des Schildausbaus Seit fast 30 Jahren ist die Konkurrenzsituation auf dem Primärenergiemarkt der Bundesrepublik Deutschland durch einen von Erdöl
Jan 1, 1984
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Application of Tensioned Cable Bolts for Supplemental Support
By Ben Mirabile, Alan Campoli, Rodney Poland
"The majority of U.S. underground coal mines use some form of cable bolt as supplemental support to a primary roof bolting system. Many coal operators employ the high load capacity of non-tensioned ca
Jan 1, 2010
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Mechanism and Prevention Measure of Rib Spalling in 6.5 Meter High Caving Face in Thick Coal Seam with Undulated Floor
By Weidong Pan, Yinchao Yang, Baodong Zuo
Fully mechanized mining technology, with a large cutting height in thick coal seam, has been developed to be large-scale, mechanized, and intelligent. Furthermore, it is also superior to other mining
Jan 1, 2017
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Modeling the Effect of Bolts on the Behavior of Rock Pillars and Associated Insights on Rib Reinforcement
By Gabriel Walton, Sankhaneel Sinha
"Rib failures are a major hazard in underground mining. When pillars are subjected to loading, extensile cracks are generated parallel to the excavation boundary, which can manifest as rib falls. A co
Jan 1, 2017
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Analysis Of Practical Ground Control Issues In Highwall Mining
By R. Karl Zipf
Highwall mining is an important coal mining method. Upwards of 60 highwall miners are presently in operation, and they may account for approximately 4% of total U.S. coal production. A review of the M
Jan 1, 2004
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Recent Experience Using Telltale Roof Monitoring Systems
By David Bigby, Tim Ross, David Conover
"Extensive arrays of telltale roof monitoring instruments were recently installed in a Mexican copper mine and a large underground mined storage facility in the eastern U.S. The data were used to eval
Jan 1, 2010
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Investigation Into Abnormal Surface Subsidence Above a Longwall Panel in the Southern Coalfield, Australia
By Winton J. Gale
The subsidence over a longwall panel at Tahmoor Mine in the Southern Coalfield of NSW, Australia, was found to be approximately twice the size it had been in previous measurements. An investigation in
Jan 1, 2011
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Suspension Designs Required in the Logical Framework
By Ross W. Seedsman
The logical framework recognises that a coal mine roof can be intrinsically stable or may collapse in one of four ways. Suspension of the immediate roof is one of fundamental ground control strategie
Jan 1, 2014
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Mechanics of Horizontal Movements Associated with Coal Mine Subsidence in Sloping Terrain Deduced From Field Measurements
By Ken W. Mills
The ground movements associated with underground coal mining and, in particular, longwall mining, are recognised to include horizontal subsidence movements, but the mechanics of the processes that cau
Jan 1, 2014
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Calibrating LaModel for Subsidence
By Keith A. Heasley, Jian Yang
"LaModel uses a laminated overburden boundary-element model and can calculate not only seam-level stresses and displacements but also surface subsidence for thin tabular deposit such as coal seams (He
Jan 1, 2016
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Ground and Standing Support Interaction in Tailgates of Western U.S. Longwall Mines Used in the Development of a Design Methodology Based on the Ground Reaction Curve
By Dennis Dolinar
"Tailgate entries in U.S. longwalls can be subjected to high loads and deformations. Therefore, tailgate entries are generally supported with varying types and amounts of standing support. However, ev
Jan 1, 2010
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Investigation of Fully Grouted Roof Bolts Installed Under In Situ Conditions (8fabb507-7dbd-4e7d-b9c9-518c3be86281)
By Craig Compton
The The National Institute for Occupational Safety ane Health (NIOSH) Pittsburgh Research Laboratory (PRL) is continuing to investigate the behavior of fully grouted roof bolts in the weak roof rock o
Jan 1, 2005
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Greater Safety With Increased Productivity Coal Mining Operations
By William B. Beerbower
When full length resin grouted bolts were introduced into U. S. coal mines some 11 years ago, it was assumed that safety would be the primary benefit. There is ample testimony to substantiate the safe
Jan 1, 1982
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An Alternative To A Manual Torque Check On Roof Bolts
By Joseph A. Cybulski
In response to the mining of reserves with increasingly adverse round conditions and the roof support recommendations of current rock mechanics theories, roof support systems have continued to improve
Jan 1, 1990
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"Void Fill Techniques for Stabilizing Roof Conditions during LongwallShield Recovery"
By Rusty Mchenry, Craig Dickerson, Robin L. Oldham
"It has been proven that longwall faces can be moved safely and efficiently. However, abutment pressures and poor ground control conditions can halt operations and be hazardous to coal miners. Recentl
Jan 1, 2015
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Chemical Consolidation For Roadway Surrounding Rock - It's Theory And Applications
By Jinhua Wang
Based on engineering examples and theoretical analysis, the mechanism of chemical consolidation for fractured roadway surrounding rock was discussed. The chemical consolidating materials and three con
Jan 1, 1996
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Study of the Behavior for Backfilling Material in Room-and-Pillar Coal Mining
By Joao Felipe Costa, Jair C. Koppe, Andre Zingano, Cleber Gomes
"Run-of-mine Brazilian coal has high ash content and low calorific power. Therefore, the coal must be washed to achieve the power plant specifications for burning coal. A large amount of waste results
Jan 1, 2010
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Highwall Mining of Thick, Steeply Dipping Coal: A Case Study in Geotechnical Design and Recovery Optimization
By David P. Conover, Jake Bain, Christopher M. Ross
"Highwall mining of thick (up to 100 ft) steeply dipping (20° or more) coal seams provides many challenges, both geotechnically and operationally because seam dips near or in excess of highwall mining
Jan 1, 2017
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Ground Control Practice at Leeville Underground Mine
By Changshou Sun
The geotechnical properties of mining zones at Leeville Underground mine (or simply called Leeville mine through this paper) are different from one zone to another. The typical ground condition is poo
Jan 1, 2013