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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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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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Transitional Geology and Its Effects on Development and Longwall Mining in Pittsburgh Seam
By Jun Lu, Mark Van Dyke, Daniel W. H. Su, Greg Hasenfus
"This paper presents the geologic and ground control challenges that were encountered by CONSOL Energy’s mining operations in southwestern Pennsylvania. A sandstone-to-limestone geology transition was
Jan 1, 2015
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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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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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Letter Of Nomination - 26th International Conference on Ground Control in Mining
By Christopher Mark
Dr. Christopher Mark serves as Team Leader of the Rock Mechanics Section in the Rock Safety Engineering Branch of the NIOSH - Pittsburgh Research Laboratory. In this position he leads a multi-discipl
Jan 1, 2007
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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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Support selection of mine roadways by means of a computer program
By Erdal Ünal
The computer program introduced in this paper is based on design guidelines developed for selection of support systems used in mine roadways. The support types considered include rock bolts as well as
Jan 1, 1989
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Design Methods To Control Violent Pillar Failures In Room-And-Pillar Mines (V. S. Bureau of Mines)
By R. Karl Zipf
The sudden, violent collapse of large areas of room-and-pillar mines poses a special hazard to miners and mine operators. This type of failure, termed a "Cascading Pillar Failure" (CPF), occurs when o
Jan 1, 1996
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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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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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Weightings And Water Inflows During Longwall Working
By I. W. Farmer
Weightings and water inflows into longwall workings often occur together, giving rise to discussions on their relative genesis. Case histories are introduced which indicate that most water inflows are
Jan 1, 1996
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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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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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Analysis Of Multiple-Seam Interaction In A Bump-Prone Western Coal Mine Using MULSIM/PC
By D. A. Donato
It is often necessary for a mining company to extract coal from a seam underlying a previously mined coal seam. The impact of the overlying mine workings on the stress distribution within the underlyi
Jan 1, 1996
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Direct determination of failure surfaces in earth slopes
By S. L. Huang
The location and shape of potential failure surfaces in soil slopes were directly determined based on the stresses induced in the soil mass and the strength of the soil itself. Stress calculations wer
Jan 1, 1989
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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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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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In-Situ Performance Analysis Of Immediate Forward Support (IFS) Systems In Thin-Medium Seam Sections In The United Kingdom
By Paul N. Freeman
This paper describes the in-situ performance of two IFS powered support installations at Betws and Penallta Collieries in the South Wales Coalfield, United Kingdom. Intensive monitoring of all powe
Jan 1, 1992
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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