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Investigating Abutment Load
By Ihsan Berk Tulu
In the Analysis of Retreat Mining Pillar Stability (ARMPS) program, the magnitude of the abutment loading adjacent to a gob area is calculated using an ?abutment angle? concept. The extent of the abut
Jan 1, 2012
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Subsidence monitoring at a shallow partial extraction room-and-pillar mine in midwestem United State
By Yoginder P. Chugh
Subsidence may be observed above partial extraction shallow room-and-pillar mines where the coal seam(s) is associated with weak and thick claystone in the floor. This paper presents results of subsid
Jan 1, 1989
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Birth Of A Longwall-Initial Planning To Post-Subsidence Mitigation
By E. D. Doney
The Kerr-McGee Coal Corporation's Galatia Mine's first longwall mining system was implemented on May 3; 1989. Start-up of the longwall face represnted the successful conclusion of an effort
Jan 1, 1990
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Realistic Design Of Ground Control Based On Geotechnical Data Obtained During Mine Development
By Kot F. Unrug
In the premining stage of engineering design, the only available data are obtained from core drilling. It is often not sufficient for a realistic design of strata control. During the development, an a
Jan 1, 1994
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An analysis of roof-pillar-weak floor interaction in partial extraction room-and-pillar mining
By W. M. Pytel
The applicability of the beam theory in analysis of roof- pillar-weak floor interaction in partial extraction room-and-pillar mining is presented. The mine structure is modeled as an equivalent multi-
Jan 1, 1989
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Rib Support Innovation At Daw Mill Colliery (a22a0861-1502-4d3d-a2cd-8a6ba0c13271)
By Jon Bowler
Daw Mill Colliery, UK Coal, near Coventry in England, mines the Warwickshire Thick Seam at 800 m/2500 ft depth using longwall retreat with gateroads supported by rockbolts. Over the last eight years
Jan 1, 2009
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The Effect of Immediate Strata on Pillar Behavior in Retreat Pillaring-- A Case Study
By A. W. Khair
This paper deals with the analysis of pillar failure in a room and pillar mining operation of a deep underground coal mine. The incident here involved the failure of more than 100 pillars. The mechan
Jan 1, 1986
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3-D Discontinuum Numerical Modeling of Rock Mass Stability Investigations Due to Ore Extraction and Backfilling, and Subsidence Estimation for an Underground Mine
By Srisharan Shreedharan, Gang Huang, Hongqing Song, Sijing Cai, Pinnaduwa H. S. W. Kulatilake
"Subsidence prediction due to ore extraction and backfilling during open stoping operations for an underground iron mine in China is reported in this paper. Geologic complexities including faults and
Jan 1, 2016
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Roof Control Analysis In North River Mine
By Mike Watts
Since the first longwall panel development started in the new mining, (Southern) area, a number of roof falls have occurred in L1 and L2 gate-entries. The longwall was delayed for a total of two month
Jan 1, 2000
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Direct Laboratory Tensile Testing Of Select Yielding Rock Bolt Systems
By John D. VandeKraats
Yielding rock bolt support systems have been developed to accommodate ground movement in shifting ground such as in coal operations; in creeping ground such as salt, trona, and potash; and in swelling
Jan 1, 1996
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The Use Of Rim- To Detect Geologic Anomalies In The Clarion Seam
By M. Craig Miller
As the trend continues in the U. S. toward inceased capital investment in longwall mining equipment and wider panels. the risk also increases for gotential financial and production loses due to undete
Jan 1, 1990
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Test Method for Assessing Water Degradation Potential of Coal Measure Rocks for Analyses of Floor, Roof, and Ribs
By G. J. Hasenfus
There are no known published methods of estimating the degradation of coal measure rocks by water that are simple and efficient, yet still provide a quantitative, meaningful value for assessing the st
Jan 1, 2005
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A Roof Quality Index For Stone Mines Using Borescope Logging
By John Ellenberger
The National Institute for Occupational Safety and Health (NIOSH) has collected pillar and span data at 34 stone mines in 10 states to develop pillar and roof span design guidelines for underground st
Jan 1, 2009
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Monitoring Mobile Roof Supports
By Kenneth E. Hay
Researchers from the U.S. Bureau of Mines conducted a field study to assess the safety of remotely controlled mobile roof supports (MRS) in a retreat pillar mining operation, Data were collected to pr
Jan 1, 1995
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Numerical simulation of coal pillar loading with the aid of a strain-softening finite difference model
By A. T. Iannacchione
Numerical simulation of coal pi1lar loading has traditionally been a difficult task due to the unique and highly variable properties of coal and the inability of numerical procedures to duplicate thes
Jan 1, 1989
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Comparison Of Empirical, Analytical, And Numerical Methods Of Pillar Design And The Development Of A Site Specific Pillar Formula
By Vincent A. Scovazzo
Many accepted and useful methods have been developed and used for pillar design. Each method has its own particular strengths and weaknesses. Three methods addressed in this paper are; empirical, anal
Jan 1, 1995
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Analysis of Multiple Seam Stability
By Christopher Mark
Multiple seam interactions are a major ground control hazard in many U.S. underground coal mines. The two most common types are: ? Undermining, where stress concentrations caused by previous ful
Jan 1, 2007
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The Response Of A High Order Stream To Shallow Cover Longwall Mining In The Northern Appalachian Coalfield
By John A. Owsiany
The effect of longwall mining on streams and shallow aquifers has been the subject of numerous research studies for more than twenty years. As a result of these studies, it has become common to consid
Jan 1, 2001
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Engineering Classification of Shales
By Robert A. Siokler
Approximately 75 percentage of the earth's land surface is comprised of shale or shale-like materials. Shale itself is composed of the residue from an almost infinite variety of weathered parent
Jan 1, 1986
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Planning And Design For Barrier Pillar Recovery Three Case Histories
By David A. Newman
Barrier pillars created during mine development provide additional reserves during mine closure and can be the sole access to reserves previously abandoned because of mining height or out of seam dilu
Jan 1, 1995