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A Step Towards Understanding The Behaviour Of Wider Roadways In South African Collieries
By George B. Quaye
Conventionally, roadways in South African collieries are 6 to 7 m wide. This dimension is chosen so as to allow maneuvrability of appropriate mine machinery and equipment, to meet production requireme
Jan 1, 2001
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Analysis of Extensometer Data from a Room Widening Experiment Designed to Induce a Roof Fall
By Dennis R. Dolinar
Roof falls, even of supported roof, still constitute a major hazard in underground mines. However, associated with any fall or instability is a pattern of roof movement. Therefore, the National Instit
Jan 1, 1997
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Volumetric Measurement of Rock Movement Using Photogrammetry
By Stephen R. Iverson, Jeffrey C. Johnson, Donovan J. Benton, Michael J. Raffaldi, Lewis A. Martin
"The NIOSH ground control safety research program at Spokane, Washington, is exploring applications of photogrammetry to rock mass and support monitoring. This paper describes two ways photogrammetric
Jan 1, 2015
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Cross Well Acoustic Tomography To Locate Abandoned Underground Mines And Subsidence Failure
By Linda K. Killoran
The U.S. Bureau of Mines has developed a prototype cross well acoustic logging system and complementary tomographic image reconstruction software for the detection and delineation of abandoned undergr
Jan 1, 1992
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FlexKnot: An Innovation in Roof and Rib Surface Control
By Anand Bhagwat
Surface control can prevent the falls of ground between primary roof support systems and rib support. Using existing industrial products, and adopting them for mining applications, has historically at
Jan 1, 2014
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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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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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Shear Testing of 28 mm Hollow Strand "TG" Cable Bolt
By Naj Aziz, Peter Craig
"Double shearing tests were carried out on the 28 mm (1 in) hollow strand Jennmar TG cable bolt to gain a better understanding of the shearing behavior of the cable. The first test was limited to a 50
Jan 1, 2010
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An Alternative for More Productive Rib Bolting in Underground Mining Applications
By Joe E. Bryan, John P. McDonnell
"Underground mine rib stability is an ongoing safety issue in all mining applications. Rib-related accidents present at least as many problems as roof-related ground control. Underground coal mine rib
Jan 1, 2015
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Overcoring Techniques to Assess in Situ Corrosion of Galvanised Friction Bolts
The effects of corrosion upon the load bearing capacity and ultimate tensile strength of galvanised friction bolts were determined. Corrosion rates were measured by overcoring of the reinforcement ele
Jan 1, 2005
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Ground Control of Longwall Top–Coal Caving Faces within Thick Coal Seams
By Jinwang Zhang, Zhaohui Wang, Jiachen Wang
"Thick coal seams (seam height larger than 3.5 m) account for a large portion of the proven coal reserves of China, and underground thick coal seam mining provides about 50% of the Chinese annual coal
Jan 1, 2017
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How Interface Friction and W/H Ratio Affect the Mode of Failure of Coal Specimens
By Syd Peng, Gamal Rashed
"Bumps in coal mines have been recognized as a major hazard for many years. These sudden violent failures around mine openings have compromised safety, ventilation and access to mine workings. Previou
Jan 1, 2015
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Mine Design Considerations For Surface Subsidence Control
By John L. Edwards
The underground coal mines in the Lake Macquarie area of the Newcastle Coalfield, New South Wales, Australia are constrained by surface subsidence restrictions as low as 150 mm. The mining environment
Jan 1, 1993
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Development, Trials, and Testing of a Two-Component, Rapid-Set Cement Grouting System
By Stephen C. Tadolini, Robert Hawker, Peter Mills, Colin Grubb, Tom Meikle
"In unfavorable strata conditions, it is often necessary to install additional long tendon support as part of a primary support cycle. Although these support systems provide the required additional st
Jan 1, 2017
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Tensile roof failure arising from horizontal compressive stress and geological slips
By Alan Bugden
Goedehoop colliery in South Africa has experienced a number of substantial roof falls in roadways and intersections. Many of these have been associated with geological slips and/or horizontal compress
Jan 1, 2003
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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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Load Deformation Behavior Of Simulated Longwall Gob Material
By Deno M. Pappas
The purpose of this U.S. Bureau of Mines study was to determine the material stiffness properties of the gob for use in numerical models of rock mass response to longwall mining. Photographs of actual
Jan 1, 1993
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On Research Needs in Coal Mine Ground Control
By Syd Peng
"As the International Conference on Ground Control in Mining (ICGCM) enters its 35th year in 2015, it is time to look back and identify the areas that need to be emphasized and to look forward to see
Jan 1, 2015
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Numerical Analysis of the Effect of Coal Seam Characteristics on the Longwall Top Coal Cavability
By Rudrajit Mitra, Tien Dung Le, Chengguo Zhang, Bruce Hebblewhite, Joung Oh
"Geomechanical and geotechnical characteristics of coal seam are important parameters that directly affect the cavability of top coal in the longwall top-coal caving (LTCC) method. The impact of these
Jan 1, 2017
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A Comparison between Empirical and Numerical Methods in Underground Galleries Support System Design
By Saeed Zandi, Kazem Oraee
"Tunnels and galleries are the most important structures in coal mines. They are used for variety of purposes, such as transporting ore and people and for ventilation. A well-designed support system i
Jan 1, 2016