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Displacement Discontinuity Method For Three-Dimensional Stress Analysis Of Tabular Excavations In Non-Homogeneous Rock (ff6cd480-c238-4f06-bf11-52c054cbd2e8)
By Leigh J. Wardle
This paper describes a numerical method for calculating the three¬-dimensional stresses and displacements induced by tabular excavations in a rock mass consisting of parallel layers of distinct mater
Jan 1, 1984
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An Overview Of The National Roof Evaluation Accident Prevention (REAP) Program
By J. M. Krese
This paper gives an overview of the National REAP program emphasizing the program's current status and future plans. A brief historical review of the program will be given containing roof-fall ac
Jan 1, 1988
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Field Experience Of Measuring The Acoustic Energy From A Hammer Blow To Coal Mine Roof And Its Relationship To Roof Stability
By Peter Altounyan
The rate of decay of the energy from a hammer blow to a coal mine roof is related to the size and nature of the contacts between the rock being struck and its surroundings The use of this principle as
Jan 1, 2000
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Three-Seam Interaction: A Case Study
By N. P. Kripakov
Results of a complex three-seam interaction analysis in a western U.S. coal mine are presented. The physical situation simulated by the models represents the development of a set of entries underneath
Jan 1, 1996
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Practical Aspects Of Mobile Roof Support Usage
By F. E. Chase
Mobile roof supports are shield-type support units mounted on crawler tracks. Mobile roof support (MRS) units are used during retreat mining, and they eliminate the setting of roadway, turn, and cross
Jan 1, 1996
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A Mine Evaluation Protocol Using Applied Rock Mechanics Techniques
By Gary B. Petersen
The author has developed a seven-step process called the Applied Rock Mechanics (ARM) Protocol that the author has used to solve numerous roof stability problems in mines throughout North America sinc
Jan 1, 2012
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Roof Stability Issues in Underground Limestone Mines in the United States (c7025d3b-53e9-40eb-abd5-d6a28b7f51f3)
By Gabriel Esterhuizen
The room-and-pillar mining method is used extensively in underground limestone mines in the Eastern and Midwestern U.S. The rock mass is typically a near-horizontal, bedded deposit at relatively shal
Jan 1, 2007
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Five Stress Factors Conducive To Bumps In Utah, USA, Coal Mines
By Joe F. T. Agapito
High stresses and adverse geology in deep coal mines in the state of Utah, USA, have caused numerous bumps. The larger bumps have been associated with seismic events with Richter magnitudes of 3.6 and
Jan 1, 2000
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Design Optimization of Longwall Chain Pillars
By Behdeen Oraee, Amirhossein Bangian, Kazem Oraee
"Determination of the optimum design of chain pillars has a significant effect on the economics and safety of longwall operations. Most pillar design formulae are based on empirical methods and supple
Jan 1, 2010
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On Rock Failure Criteria for Coal Measure Rocks
By Murali Gadde
Design of underground excavations in coal mines involves two major tasks: estimation of stresses and determination of rock mass strength. Owing to the complicated nature of rock mass, progress in its
Jan 1, 2007
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The Unpredictable Life Cycle of a Coal Pillar (b2bcadc5-82a3-454e-be3a-6b79e9867244)
By Stephen Tadolini
A unique circumstance created by monitoring a pre-driven longwall recovery room permitted measuring the stresses of a coal pillar throughout its entire life cycle in less than a week. A fender pillar
Jan 1, 2007
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Technique To Measure Resultant Load Vector On Shield Supports (b937ef33-c51b-4de4-a956-dc8be749fea8)
By Thomas M. Barczak
The resultant load vector is the representation of the forces applied to a longwall roof support element by caving strata into a single, quantifiable measure of support resistance. The relatively comp
Jan 1, 1984
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Finite element analysis and comparison of shaly mine roof support systems
By K. F. Unrug
In the paper a numerical modeling method is used for evaluation of a roof support system, which is commonly used in the US coal industry. The effectiveness of mechanical roof bolting with or without,
Jan 1, 1989
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Design and Performance of a Longwall Coal Mine Water-Barrier Pillar
By Francis Kendorski
The Skyline #3 Mine of Canyon Fuel Company in Utah was planning longwall mine development adjacent to and downdip of older mine workings known to be flooded. Barrier pillar geometries and widths were
Jan 1, 2007
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Comparative Study Of Western US Longwall Panel Entry Systems
By Khamis Y. Haramy
This paper summarizes ground control studies of longwall panel entry systems in two Western U.S. coal mines. Presented are comparisons of in situ pressure change measurements and assessments of chain
Jan 1, 1989
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Drainage Of Water From Abandoned Mines By Horizontal Drilling
By Alan J. Zeni
Drainage of water from abandoned underground mines has become important in recent years because of safety concerns when mining near abandoned works or reentering abandoned mines for further developmen
Jan 1, 1990
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Cable Bolting - Potential Applications For Variable Strata Conditions
By David Allen
Cable bolting is a relatively new strata reinforcement technique that has been used successfully in Australia and the United Kingdom. Jim Walter Resources, Inc. has examined the principles and can vis
Jan 1, 1994
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Regularities Of Rock Pressure Manifestations In Longwalls In Terms Of The Theory Of Plates And Limit Equilibrium
By V. M. Shick
With gentle bedding within the zone of support pressure the delamination in roof rocks may occur only on those stratification planes where cohesiveness of rock is close to zero. Unlike this, at dip an
Jan 1, 1996
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A Troubleshooting Guide for Roof Support Systems
By Raymond A. Mazzoni
Over the last twenty years, roof support technology has made numerous advances since the original wedge and slotted bolts of the 1950's. By comparison, the roof supports used today are more compl
Jan 1, 1997
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Numerical Simulation of Reinforced Concrete Mine Seal Subjected to Explosion Loading
By Khaled Morsy
The tragic incidents at Sago and Darby coal mines in 2006 pointed out the need for stronger seals to resist the blast effects of violent gob explosions. Mine Safety and Health Administration (MSHA) ha
Jan 1, 2008