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Alternatives For Controlling Cutter Roof In Coal Mines
By Nicholas P. Kripakov
The unpredictable massive collapse of roof in openings developed under apparently safe and stable roof conditions in coal mines of the United States has been of much concern for many years. One type o
Jan 1, 1982
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Massive Pillar Collapse: a Room?and?Pillar Marble Mine Case Study
By Sandin E. Phillipson
The Mine Safety and Health Administration?s Roof Control Division responded to a massive ground failure at an underground marble mine in northern Georgia. The ground failure occurred in a benched area
Jan 1, 2012
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Application of Thin Spray on Liner (Masterseal) at Longwall T-Junction Sections in German Hard Coal Mines
By Uwe Wyink, Guenther Thiele, Isabel Gollnick, Klaus Thyrock
"The application of a thin spray on liner was implemented in longwall T-junction sections in 2009 for the first time. The development of the material and the application is based on a technical cooper
Jan 1, 2010
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Extending the Limits of Strata Bolting by the Use of Flexible Strand Rockbolts
By Dennis R. Barratt
Rockbolting is now used extensively as a method of primary support in UK coalmines. Over the past fifteen years an optimum bolting system has evolved, based on a high grade steel bolt and a very stro
Jan 1, 1997
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Experience With The Boundary Element Method Of Numerical Modeling As A Tool To Resolve Complex Ground Control Problems
By George J. Karabin
The Roof Control Division of the Pittsburgh Safety and Health Technology Center, MS HA, is routinely involved in the evaluation of ground conditions in underground coal mines. Assessing the stability
Jan 1, 1994
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Truss Systems For Longwall Tailgate Support - Update
By John C. Stankus
At the 13th Conference on Ground Control in Mining, a paper was presented detailing a successful test in which a new truss system was utilized, in lieu of wood cribs, for tailgate support in the Pitts
Jan 1, 1995
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Roof Movement and Loading for Top-Coal Caving Longwall Mining in Extremely Inclined Thick Coal
By Shengliyang Yang, Jinghu Yang, Jiachen Wang, Xiaomeng Li
"Safe and efficient mining of extremely inclined thick coal seams less than 20m thick is one of the new challenges in China coal industry. In recent years, the extremely inclined thick coal seams have
Jan 1, 2016
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A Casting Method For Artificial Rock Specimens
By Da Zhao Gu
An important problem in rock engineering is to control the properties of artificial rock. A compaction technique for casting artificial rock specimens with controlled properties is described, i.e. usi
Jan 1, 1992
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Underground Application Of Optimization
By S. J. Jung
The goal of this research is to demonstrate how optimization methodology can be coupled with the finite element method for greater stability of underground mine openings. As a result of increasing min
Jan 1, 1993
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Coal Strength Variation by Lithotype for High-Volatile a Bituminous Coal in the Central Appalachian Basin
By John A. Rusnak
"This paper discusses the variation of coal strength based on the megascopic coal lithotypes for Central Appalachian high-volatile A coal beds. The composition of coal beds is complex and variable, de
Jan 1, 2017
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A Simple Method Of Measuring Rock Fracture Toughness Using The Brazilian Test Method
By H. Guo
There are a number of methods available for the determination of the fracture toughness of rock. Some of the most recognised methods include the hollow pressured cylinder, the short-rod, the chevron -
Jan 1, 1992
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Investigation of the Stability of a Pillar Retreat Section at the Fletcher Mine
By Doug Tesarik
Researchers from the National Institute for Occupational Safety and Health1 (NIOSH), together with employees from The Doe Run Company, are monitoring and evaluating the stability of a pillar retreat s
Jan 1, 2006
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The Influence of the First Layer Thickness of Immediate Roof on its Stability
By Lixun Kang
Bedded structure is the characteristics of coal measures strata. Bedding planes, coal streaks and soft rock bands existing in roof strata destroyed its continuity in the direction perpendicular to the
Jan 1, 2005
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Cross?Correlation Detection of Seismic Events Related to the Crandall Canyon Mine Collapse
By Tex M. Kubacki
On August 6, 2007, the Crandall Canyon Mine experienced a collapse which trapped six mine-workers. An MW 4.1 seismic event was recorded in conjunction with this collapse. An additional 54 seismic even
Jan 1, 2013
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Ground Control Problem Associated with Longwall Mining of Developed Pillars
By T. N. Singh
Board and pillar system of mining has beer, practised in India in view of abundant availability of cheap labour force, low investment and quick return. Subsequently, selective mining from thick seems
Jan 1, 1984
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STRATA III ? A Full-Spectrum Roof Control Concept
By John H. Perry
Strata III is a full-spectrum roof control system which provides the mine operator the ability to upgrade his roof control in place. The procedure is easily adaptable with current roof bolting techniq
Jan 1, 1987
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Rock Mechanics Property Data Bank For Coal Measure Strata
By G. C. Sun
Rock mechanics properties, i.e. uniaxial and triaxial compressive strength, indirect tensile strength shear strength, Young's modulus, and poisson's ratio were collected for coal and related
Jan 1, 1993
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Highwall Stability in an Open Pit Stone Operation
By Chris Kelly
The Monroe County Quarry is an open pit granite quarry located near the town of Bolingbroke. Monroe County. Georgia. The quarry has been in continuous operation for approximately 10 years. The quarry
Jan 1, 2002
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Evaluation And Design Considerations For Pillar/Roof Separation In An Operating Coal Mine (3e69124f-30b4-40c5-9503-bd59304b248f)
By Mike Amick
As virgin coal reserves dwindle, more and more mines are being opened in areas with previous mining. As addressed in this conference before, there are solutions available for designing mines extracti
Jan 1, 2009
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Establishment and Application of Deformation Monitoring System of Roadway Based on the Three?Dimensional Model Experiment
By Yongping Wu
Roadway deformation and stress migration occur with uncertainty and randomness because of geology, tunneling and mining influence. In order to study the surrounding rock deformation and failure mechan
Jan 1, 2013