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The Significance of Specimen Stiffness and Post Yield Characteristics on Passive Roof Support Design
By Thomas M. Barczak
The intent of this paper is to make mine operators and engineers aware of parameters which affect the loading behavior of passive roof support systems. The strength of a passive roof support element a
Jan 1, 1987
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Major Hazard Risk Assessment Applied To Pillar Recovery Operations (ad413764-c947-4465-9ec3-62ea91281168)
By A. T. Iannacchione
Recent fatal injuries occurring during pillar retreat coal mining call for better identification of the hazards and recognition of risks. Ground control hazards associated with room-and-pillar retrea
Jan 1, 2009
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A Mine Evaluation Protocol Using Applied Rock Mechanics Techniques
By Gary B. Petersen
The author has developed a seven-step process called the Applied Rock Mechanics (ARM) Protocol that the author has used to solve numerous roof stability problems in mines throughout North America sinc
Jan 1, 2012
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Coal Mine Burst Prevention Controls
By Anthony Iannacchione
Coal mine bursts have represented a major hazard for U.S. mining operations for more than 90 years. During this time, many prevention controls have been developed and tested. This paper reviews 11 p
Jan 1, 2008
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Roof Stability Issues in Underground Limestone Mines in the United States (c7025d3b-53e9-40eb-abd5-d6a28b7f51f3)
By Gabriel Esterhuizen
The room-and-pillar mining method is used extensively in underground limestone mines in the Eastern and Midwestern U.S. The rock mass is typically a near-horizontal, bedded deposit at relatively shal
Jan 1, 2007
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Technical Assessment of Subsequent Burdens due to Hard Coal Mining
By Axel Preusse
On the basis of the Law on Financing Hard Coal Mining dated 28 December 2007, the subsidized German hard coal mining industry will be shut down to the end of the year 2018 in a socially acceptable man
Jan 1, 2008
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Large Scale Ground Instability Caused By Failure of Underlying Pillars: A Case Study of Dynamic Multiple Seam Interaction
By Christopher Mark
Severe dynamic multiple seam interactions can occur when active mine workings are subsided by underlying mining activity. The most dramatic events are usually caused by longwall mining or pillar recov
Jan 1, 2012
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The Development and Application of Polyurethane Injectable Cable Bolts
By Dakota D. Faulkner
Cable bolts have been very effective in mine ground control. Non-tensioned and tensioned cable bolts are now used for both primary and supplemental bolting (Suder, 2001; Mirabile, 2010). In the United
Jan 1, 2012
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New Type of Load Cell for Monitoring of Roof Bolt Tension
By K. Unkug
It is commonly accepted that the tension of roof bolts can be used as a measure of the effectiveness of roof support performance in coal bearing strata. The conceptual base for the assumption orig
Jan 1, 1986
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Front abutment effects on supplemental support in predriven longwall equipment recovery rooms
By Jeffrey M. Listak
This report describes a study, conducted jointly by BethEnergy Mines Inc. and the Bureau of Mines, to assess the effects of longwall front abutment loading on various supplemental support materials u
Jan 1, 1989
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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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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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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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New Approach in Rock Bolting that Adds to Bearing Capacity and Yield of the Bolts without Increase to the Cost of the Technology
By Victor Nazimko
A new technique for reaming the holes has been tested. This technique is available for reaming a hole at its deep end creating an enlarged cavity that has helicoidal grooves oriented at less than 40 d
Jan 1, 2008
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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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Work Practices to Manage Bump Prone Ground
By Floyd Varley
In deep and highly-stressed coal mining, advanced design practices are used to minimize the potential for damaging events to occur. Despite these design efforts, the hazard of coal mine bumps can not
Jan 1, 2008
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The Load Transfer Properties of Post?Groutable Cable Bolts Used in the Australian Coal Industry
By Rob Thomas
Adequate load transfer is considered essential for optimum ground support and is increasingly important in weak roof and/or high stress environments. If adequate load transfer is achieved not only can
Jan 1, 2012
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Influence Of Discontinuity Orientations And Strength On Cavability In A Confined Environment
By L. J. Lorig
Much of the present knowledge about caving behavior of rock masses has been obtained from empirical observations. Additional notions about caving have been developed through inferences derived from tw
Jan 1, 1989
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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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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