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New developments with the coal mine roof rating (7c278b2d-cc1e-4949-9bd2-643d1af010e5)
By Chris Mark
The Coal Mine Root Rating (CMRR) was first presented at this Conference nine years ago. Since Its Introduction, the CMRR has been incorporated into many aspects of mine planning. including longwall pi
Jan 1, 2002
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Dynamic Failure in Coal Seams: Implications of Coal Composition for Bump Susceptibility
By Arthur Miller, Andrew Weakley, Heather E. Lawson
"IntroductionDynamic failure events in an underground coal mine, or “bumps,” are defined as “the sudden, violent bursts of coal from a pillar or pillars or a block of coal, resulting in a section, the
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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Application of Stress, Geologic, and Support Design System (Sgssm) to Ground Control for Mine Slope Entries
By John Stankus
Accurate evaluation of stress and geological conditions is critical to ground control design in underground openings. For a mine slope entry, the problem becomes more complicated because a slope trans
Jan 1, 2011
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Why Dead Load Suspension Design for Roadway Roof Support Is Fundamentally Flawed Within a Pro?Active Strata Management System
By Russell C. Frith
Risk-based roadway roof support design is now a critical part of the Australian Coal Industry. Safe and efficient mining demands that roof support be tailored to the prevailing geotechnical conditions
Jan 1, 2011
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How to Design an Efficient Roof Bolting Plan Based on Simple In-Mine Measurements
By C. J. H. Brest van Kempen
The techniques developed should provide a useful tool, not only during the initial formulation of a suitable bolting plan for a new section, but also for periodic check¬ing on the utilization factor
Jan 1, 1986
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Progress In The Development Of A Roof Bolt Design Methodology Based On Resisting Shear
By Ross Seedsman
There are many models for how roof bolts behave, one of which is prevention of shear along bedding. The basis of this model is that a roof beam will not delaminate if bedding parallel shear can be pre
Jan 1, 2000
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A Novel and Effective Method to Develop Tension in a Roof Bolt
By Phillip E. Gramlich
Through extensive practical experience and multiple studies, tensioned roof control systems have proven beneficial in difficult mining conditions. Due to increased mining of less desirable seams, ten
Jan 1, 2014
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A Study On Application Of Comprehensive Rock Mechanical Properties And Geological Characteristics In Coal Mines
By Xu Linsheng
Datong coal Mine suffers from delays and sudden caving of its massive competent conglomerate roof. Detailed geological studies of the nature of pebbles and matrix of the conglomerate and its sparse be
Jan 1, 1992
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Axial Performance of a Modified Fully Grouted Cable Bolt Tested with a New Laboratory Short Encapsulation Pull Test
By Paul C. Hagan, Jianhang Chen, Serkan Saydam
"Modified cable bolts are commonly used in underground mines due to their superior performance in preventing bed separation when compared with plain strands. To better test the axial performance of a
Jan 1, 2015
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Think Like a Rock
By Tom Barczak
Early in my career, while giving a presentation on shield design for longwall mining at one of the International Conferences on Ground Control in Mining, the late Jim Scott told me that I was finally
Jan 1, 2011
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Controlling Subsidence Effects Using Partial Backfilling
By Yingzin Zhou
Partial backfilling can be used to reduce and control surface subsidence damage caused by longwall mining or pillaring operations in room-and-pillar mines. The use of partial backfill as opposed to to
Jan 1, 1990
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Determination And IT-Supported Evaluation Of Rock Mechanical Parameters And Their Utilization During Application Of Roof Bolting Techniques
By Nikolaos Polysos
For the planning and driving of gateroads supported by roof bolts a practical concept has been developed in order to determine the geological and rock mechanical parameters derived from exploration dr
Jan 1, 2001
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Mapping Hazards With Microseismic Technology To Anticipate Roof Falls - A Case Study (ac4523c6-7bdb-4660-a1cb-20433a65c0ed)
By Anthony Iannacchione
As the amount of new fractured surfaces or "damaged rock layers" within roof rock increases, the stability of the rock mass decreases. While direct measurements of this phenomenon are not easily made,
Jan 1, 2004
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Recent Innovations for Slope Development
By Tim Burgess
Patton Mining, LLC and J.H. Fletcher Company recently collaborated and mechanized the sometimes hazardous, and always labor intensive, process of installing standing steel supports during the construc
Jan 1, 2011
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Geotechnical Considerations for Longwall Top Coal Caving at Austar Coal Mine
By Adrian L. Moodie
Austar Coal Mine (formerly Southlands and Ellalong Collieries) has had a long association with difficult strata control conditions associated with mining depth and a highly jointed/cleated coal seam.
Jan 1, 2011
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Three Dimensional Numerical Modelling Of Effects Of Subsidence On Escarpments
By Leigh J. Wardle
Significant coal reserves in New South Wales lie under areas with steep topography such as valley slopes and cliffs. Subsidence predictions are difficult to make for these locations as existing empiri
Jan 1, 1992
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Understanding the Connection between Blasting and Highwall Stability
By R. Quentin Eades, Kyle Perry
"Surface mines continue to implement highwalls for several reasons, such as increasing recovery, improving margins, and justifying higher stripping ratios. Highwall stability is a complex issue that i
Jan 1, 2018
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Numerical and Physical Modeling as Planning Tools for Rockbolted Roadways
By Peter Griesenbrock
In German underground coal mining mostly arch and some rectangular roadways are used in the development work. Due to its positive results from numerical and physical modeling techniques as well as goo
Jan 1, 2002
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Remote Mining Using Water for Ground Support
By Robert L. Schmidt
The support of underground openings by water is a natural phenomenon. Surface sinkholes, such as those that occur with some frequency in Florida, are attributed to a lowering of the water table result
Jan 1, 1986