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Roof Behavior In South African Coal Room And Pillar Panels
By Bruce W. Jack
An extensive underground roof-monitoring program was conducted in order to determine the roof strata behavior under various conditions. In total 29 sites at 5 different collieries were monitored using
Jan 1, 2000
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Method Of Selecting Suitable Types Of Powered Supports At Longwall Faces
By S. M. Hsiung
A model (support selection model) for the selection of suitable types of powered supports under various geological conditions is proposed. This model is developed by evaluating the support, performanc
Jan 1, 1988
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Coal Bursts That Occur During Development: A Rock Mechanics Enigma
By Christopher Mark
Coal bursts are typically associated with highly stressed coal. Most bursts occur during retreat mining (longwall mining or pillar recovery) in highly stressed locations like the tailgate corner of th
Jan 1, 2017
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A Rock Mass Strength Concept For Coal Seams
By George S. Kalamaras
Coal strata strength is included as a vague term in most of the pillar design formulas, either as a questionable fraction of the intact coal strength or a size-dependent relationship for scaling down
Jan 1, 1993
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Effect Of Face Advance Rates On The Characteristics Of Subsidence Processes Associated With U.S. And German Longwall Mining Operations
By Yi Luo
Regulating the face advance rate in longwall mining operation can be an effective means to reduce the disturbance potential to surface structures associated with a longwall subsidence process. However
Jan 1, 2001
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Time Dependent Strength Of Coal Strata For Long-Term Pillar Stability
By Z. T. Bieniawski
A major study was performed on determination of long term strength of coal strata directed to the design of coal pillars to ensure their stability beyond the life-time of a mine. Based on field invest
Jan 1, 1994
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Hydrogeologic Effects Of Subsidence At A Longwall Mine In The Pittsburgh Coal Seam
By Leslie Carver
The effects of longwall mine subsidence on water resources were studied at a West Virginia coal mine (mine Z) by Carver (1994). Data were obtained for 137 domestic supply wells and springs and 12 base
Jan 1, 1994
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Practical Aspects Of Longwall Pillar Design
By Christopher Mark
The past decade has provided a wealth of practical experience with longwall pillar design. Design formulas developed specifically for longwalls have proven their value in numerous applications. Analyt
Jan 1, 1990
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Shield Monitoring To Forecast Severe Face Weightings At The South Bulga Colliery, NSW, Australia
By Jim Sandford
The South Bulga Colliery longwall operation, owned and operated by Cyprus Coal Australia. Oakbridge Pty. Ltd., and located near Singleton, NSW, is currently operating under an average 80-ft-thick (24-
Jan 1, 1999
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Modern Geotechnical Exploration And Mine Design
By Patrick S. Artrip
A deep mining operation in the Lower Kelly (Imboden) seam in Wise County, Virginia experienced severe ground control conditions in its attempt to develop reserves situated under increasingly higher co
Jan 1, 1993
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Stooping Low Safety Factor Pillars at Goedehoop Colliery - 12 Months Later
By Gift Makusha
Pre-feasibility work at Goedehoop Colliery indicated that stooping of the undersized pillars could be undertaken safely and economically. In light of the findings a decision was taken in may 2003 to u
Jan 1, 2004
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The Influence Of Stream Valleys On Coal Mine Ground Control
By John L. Hill
Over 50 mines of the Appalachian and Illinois Basins are presently experiencing poor ground conditions believed to be caused by overlying stream valleys. The Bureau of Mines is conducting research int
Jan 1, 1988
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The Importance of Underground Stone Mine Roof Geology
By Frank Kendorski
Several startup or longtime underground stone mines have experienced unanticipated roof control difficulties due to the variable geologic character of the roof strata. Careful mapping of roof conditio
Jan 1, 2002
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Research on the rational structure of tensible rockbolt and the effect of surrounding rock reinforcement
By Chao-jiong Hou
The necessity of using tensible rockbolt in the roadway with soft rock, high in-situ stresses, mining influence and other complex conditions was discussed, the structures of three kinds of tonsibte ro
Jan 1, 1989
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MSHA Technical Review of Proposed Mine Designs for U.S.Underground Coal Mines
By Michael Gauna
Ground fall injuries and fatalities in United States underground coal mines have shown a diminishing trend. Advances in bolting and standing support systems have led to improved safety in underground
Jan 1, 2011
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Determination Of Plate Size Effect On Ultimate Bearing Capacity Of Weak Floor In Underground Coal Mines Using A Boundary Integral Approach
By Zhanjing Yu
In this paper, an equation is developed to characterize the relationship between the UBC and plate size using a boundary integral approach. The equation was validated by the results from mo& than seve
Jan 1, 1993
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Massive Pillar Failure--Two Case Studies
By David H. Tang
Similar massive pillar failures were observed in two underground coal mines with different configurations of mine workings and overburden depths. Finite element models were used to analyze the causes
Jan 1, 1984
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Tekflex As A Sprayon Screen Replacement In An Underground Hard Rock Mine
By Chris Pritchard
Falconbridge Ltd., a major base metal producer in the Sudbury Basin of Ontario, Canada, identified a need to find a safe and cost effective replacement for welded-wire mesh used to support loose groun
Jan 1, 1999
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Innovative Concept In Tailgate Entry Support: Elimination Of Crib Blocks Through Utilization Of New High Capacity Roof Truss Systems (3aab4965-6f53-4caa-9e67-bf9dbe5d5a16)
By John C. Stankus
In this paper, an innovative concept in longwall tailgate support is discussed. This new concept utilizes a new high capacity roof truss system in lieu of conventional wooden crib block. The first fie
Jan 1, 1994
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GIS Supported Evaluation of Surface Level Impacts Due to Abandoned Near?Surface Mine Locations
By Alexander Kattner
Surface fractures in urbanized areas show the risk potential of near-surface mining. This kind of mining subsidence damage occurs mainly in areas where hard coal was mined near the surface with very l
Jan 1, 2011