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Stress Variation on Longwall Powered Supports in Upper Seam due to the Presence of Old Mined Out Workings in Lower Seam
By Vedala Sastry
Longwall mining for coal extraction in deeper deposits is gaining momentum in India, due to the increasing stripping ratios and depletion of shallow deposits amenable for surface mining. In longwall
Jan 1, 2007
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Think Like a Roof Bolt ? Then Make It Scream ?
By Greg Smith
This paper documents the use of bench testing equipment developed to enhance the understanding of, and improve upon, common roof bolt support systems. Most roof bolt systems consist of components that
Jan 1, 2012
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Designing Free-Standing Steel Supports for Coal Mine Roof Support
By Sam Spearing
Free-standing supports are commonly used in coal mines in the USA, particularly when longwalling. A recent trend has been the development of prop supports. Prop supports have many advantages over bu
Jan 1, 2008
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Aspect Ratio and Other Parameters That Affect the Performance of Burrell Can Roof Supports
By David F. Gearhart
The Burrell Can1 is a thin, steel, tubular shell filled with aerated concrete that is used as a roof support in coal mines. The Can height is always shorter than the mining entry, so it is capped with
Jan 1, 2012
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Is Mining Coal at a 900M Below Surface at the Xuandong Coal Mine in China Challenging or Just Interesting Rock Mechanics?
By Wouter Hartman
Xuandong Coal Mine is mining coal in one of the most challenging underground environments in the world. This work has found that it is not only challenging but it also has the composition for some int
Jan 1, 2012
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Keynote Address at the 23rd International Conference on Ground Control in Mining, August 3-5,2004
By Lewis Dr. Wade
It is really an honor and pleasure to be here at the 231d International Conference on Ground Control in Mining. My name is Lew Wade. Until recently I served as the Associate Director of Mining for NIO
Jan 1, 2005
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Horizontal Stress and Coal Mines: Twenty-Five Years of Experience and Perspective
By G. J. Hasenfus
Although theoretical and conceptual knowledge regarding the impact of horizontal stress on underground coal mining excavations have existed since at least the mid-1900s, it wasn?t until the late 1970?
Jan 1, 2006
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Time-Lapse Tomography of A Longwall Panel: A Comparison of Location Schemes (919eac95-0539-40b5-9304-f250d4890ab6)
By Kray Luxbacher
Three-dimensional time-lapse velocity tomograms were generated to image stress redistribution around a longwall panel to produce a better understanding of the mechanisms that lead to ground failure.
Jan 1, 2007
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Application of Phenolic Foam in Longwall Mining
By Marc Arl
Failures of the face and roof above longwall shields have caused days and sometimes weeks of lost production. A common recovery method for these failures has been to pump light weight cementitious gro
Jan 1, 2005
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Overmining In Kailuan, China Mining Area (d9eb7d79-18c1-4a77-a59a-53706a90764b)
By Jun Han
Coal has been mined in the Kailuan mining area for more than 130 years. The remaining reserves consist of, in large part, coals that would have been considered economically unminable or technically no
Jan 1, 2009
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New Era in Longwall Top Coal Caving Geomechanics
By Abouzar Vakili
Longwall Top Coal Caving (LTCC), as the most attractive method for thick coal seams, has been suffering from insufficient geomechanical understanding for the past few years. Cavability without doubt
Jan 1, 2007
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Moonee Colliery: Renewing The Economic Viability Of A Mine Using Microseismic And Hydraulic Fracturing Techniques In Massive Roof Conditions
By Peter Hayes
Moonee Colliery operates a longwall extraction system in the Great Northern seam of the Newcastle Coal Measures, approximately 100km north of Sydney, NSW. In the initial mine area of longwall block
Jan 1, 2000
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Finite element analysis and comparison of shaly mine roof support systems
By K. F. Unrug
In the paper a numerical modeling method is used for evaluation of a roof support system, which is commonly used in the US coal industry. The effectiveness of mechanical roof bolting with or without,
Jan 1, 1989
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Design And Control Of Working Support In Polish Coal Mines Based On Three-Dimensional Numerical Modeling
By Slawomir Bock
One of the fundamental issues having a great influence on the safety of operations performed in underground mines is the support of workings which should assure their stability in a given geological s
Jan 1, 2009
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A Hydrogeomechanical Study Of Overburden Aquifer Response To Longwall Mining
By G. J. Hasenfus
This paper presents the results of an extensive hydrological and geomechanical monitoring program which Gas conducted at a longwall coal mine in W. Va. The field program included monitoring of groundw
Jan 1, 1988
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Effects of Transverse Isotropy on Vertical Stresses When Multi?Seam Mining under Supercritical Longwall Panels
By Anastasia M. Suchowerska
The design of effective ground support requires a sound understanding of the pre-mining state of stress in the stratum to be mined. Irregularities in the stress field encountered during multiseam mini
Jan 1, 2012
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Reflections on the Application of Geophysics to Ground Control
By Peter Hatherly
As a discipline, geophysics covers an enormous range of scales and applications - from planetary geophysics through to the monitoring of acoustic emissions of rock samples. Although it is not a core d
Jan 1, 2006
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Stooping Low Safety Factor Pillars At Goedehoop Colliery
By Gift Makusha
The Witbank Coalfield in South Africa contains up to five economically viable coal seams. These seams have been mined continuously for over 100 years and the reserve in now becoming depleted. The norm
Jan 1, 2003
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The Forensics Of Underground Roof Falls (c5c31282-77d4-44b1-8aa1-d01534eb267d)
By Steve Tadolini
Underground roof falls can have devastating effects on the safety of operations personnel, and equipment, and seriously impact production. Immediate steps are usually taken to danger off and secure t
Jan 1, 2009
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Determination of the Strength of Powered Roof Supports According for Fatigue Life
By Monika Patrycja Polak - Micewicz
This paper presents an approach for estimating the fatigue life for the base of powered roof supports (shield) manufactured by the FAZOS roof support company. FAZOS?s powered roof supports are designe
Jan 1, 2012