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Highwall Stability Implications from Longwall Mining at Broadmeadow Mine
By Bob Coutts, Matt Martin, Dan Lynch, Dan Payne
"The Broadmeadow punch longwall coal mine in Central Queensland Australia has experienced significant highwall movement associated with the effect of longwall subsidence when the longwalls approach th
Jan 1, 2018
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Mechanical Response of Split-Set Rock Bolts in Squeezing Ground
Researchers from the National Institute for Occupational Safety and Health's Spokane Research Laboratory installed Split-Set rock bolts instrumented with strain gauges to document the mechanical
Jan 1, 2005
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Comparisons Of Active Versus Passive Bolts In A Bedded Mine Roof
By Steve P. Signer
A study of rock support interaction mechanics was conducted by the U.S. Bureau of Mines at the Jim Walter Resources No. 7 Mine, Brookwood, AL. Bolt loads and entry deformation were monitored at four s
Jan 1, 1993
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Validation of Overburden Failure Zone in Complex Extra Thick Coal Seam by EH?4 Magnetotelluric Method
By Hai Rong
EH-4 Electrical conductivity imaging system has been playing an important role in prospecting, looking for water resource, and determining coal mine gob boundary by virtue of its significant advantage
Jan 1, 2014
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In Situ Stress For Underground Excavation Design In A Naturally Fractured Rock Mass
By Andrew J. Hyett
The ISRM commission on testing methods has recently presented Suggested Methods for rock stress determination (Kim & Franklin, 1987). This proposes that even if the magnitude of in situ stress is not
Jan 1, 1989
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Development of Road Header Roof Bolting Module
By Sean C. Farrell
In underground mining and tunneling, machine design is predominantly dictated by mine conditions and individual customer desires. In partnership with Australian companies WDS Limited and Cram Fluid P
Jan 1, 2014
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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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Floor Heave Control Outby the Seal Line in No. 11 West Kentucky Seam
By Joel Bradley, Kot Unrug, Kyle Perry, Mark Klimek
"A West Kentucky mine operation in No. 11 seam, encountered floor heave, due to the localized increase of the thickness in the fireclay mine floor. Floor heave has overridden seals installed in two mi
Jan 1, 2015
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Management of Floor Heave at Bulga Underground Operations—A Case Study
By Kudret Tutuk, Serkan Saydam, Sungsoon Mo
"This paper presents an overview of the floor heave management at the Glencore Bulga Underground Operations and investigates the contributing factors to the behaviour of the floor. The mine experience
Jan 1, 2018
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Protecting Underground Coal Miners From Rib Falls
By Michael Gauna
In 2010, the number of fatal rib falls in U.S. underground coal mines exceeded fatal roof falls for the first time ever. While recent trends have seen roof fall fatalities reduced by about 62% since t
Jan 1, 2011
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Rock Mechanics Study Of Lateral Destressing For The Advance-And-Relieve Mining Method (2bf3b56c-1393-4658-a2e4-6e9ace0d24dd)
By Hamid Maleki
The advance-and-relieve method benefits from lateral destressing associated with mining in laminated rocks and a high horizontal stress regime. This stress control method is based on measurements show
Jan 1, 2003
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Evaluation Of Mobile Roof Support Technologies
By Hamid Maleki
This study presents a historic overview of the role of mobile roof support (MRS) technologies in improving stability and worker safety and presents the results of recent field evaluations of the MRS l
Jan 1, 2001
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Use of a Laser Grid System for Accurate Roof Bolt Location
By William Kendall
"A tremendous amount of research, analysis, and engineering time is used to design a proper roof support system including the type, length, and location of the roof bolts. Unfortunately, since the roo
Jan 1, 2016
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Detection and Monitoring of Surface Subsidence Associated with Mining Activities in the Witbank Coalfields Using Differential Radar Interferometry
By Gift Makusha
Surface subsidence associated with coal mining activities in the Mpumalanga Province of South Africa changes the natural environment in several ways, and current challenges for mining companies includ
Jan 1, 2011
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System Behavior of Roof Bolt Systems with Varying Bearing Plate I Angle Compensating Device Combinations
By Gregory E. Smith
"Tensionable headed roof bolt systems are common in the U.S. mining industry. In the last 15 years or so, they have made a comeback as a hybrid system where a mechanical anchor is used in conjunction
Jan 1, 2016
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A Review of the Geomechanics Aspects of a Double Fatality Coal Burst at Austar Colliery in NSW, Australia in April 2014
By Bruce Hebblewhite, Jim Galvin
"A coal burst occurred on 15 April, 2014 at the Austar Coal Mine, located west of Newcastle, NSW, Australia. The burst resulted in fatal injuries to two men working as part of the mining crew at the d
Jan 1, 2016
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Pillar Design - Continuous Miner Butt Section And Longwall Development Sections
By Lawrence R. Artler
The North American Coal Corporation, its subsidiaries and other coal companies, have been mining the Pittsburgh #8 seam in Eastern Ohio for several decades. Underground mining by the "room and pillar"
Jan 1, 1984
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Analysis of Alternatives for Using Cable Bolts as Primary Support at Two Low–seam Coal Mines
By Gabriel S. Esterhuizen
"Cable bolts are sometimes used in low-seam coal mines to provide support in difficult ground conditions. This paper describes cable bolting solutions at two low-seam coal mines in similar ground cond
Jan 1, 2015
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Key Technologies of Integration of Coal Mining–Gangue Washing–Gob Backfilling
By Wei Yin, Yu Wu, Xiexing Miao
"For engineering problems of “three under” coal (coal trapped under buildings, waters-bodies and railways) exploitation, environment protection and gangue separation from raw coal underground exist in
Jan 1, 2015
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Mitigation of Longwall Subsidence Effects on Operating Railroad
By Robert Kimutis, Ke Yang, Yi Luo, Jianwei Cheng
"Surface subsidence processes, especially those associated with a longwall mining operations, could cause operational and/or safety problems to railroads. For railroads with normal amounts of traffic,
Jan 1, 2010