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In-Situ Testing Of Roofex Yielding Rock Bolts In Coal Ribs (d7c8f4cb-6d76-4845-93df-11dd74a1d904)
By Sean Harvey
One of the manifestations of the dynamically induced failures in deep coal mines is the violent ejection of coal from the ribs. A possible protection against such failures is the use of a specificall
Jan 1, 2009
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Quality Assurance in the Processing of Mining-Induced Subsidences and Research Work Into Mining Subsidence Engineering in the German Hard Coal Industry
By Peter Fischer
Between 45,000 and 50,000 claims for subsidence are submitted each year to the German hard coal industry. In order to improve the service to claimants a quality management was established in 2005. Thi
Jan 1, 2006
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Why Uniaxial Compressive Strength and Young?s Modulus Are Potentially Poor Indicators of Roadway Roof Stability ? Except in the Tailgate
By Russell Frith
For many years, underground rock mechanics and in particular, roadway/tunnel roof stability has been underpinned by the often unchallenged assumption that roof strength (as defined by the UCS) and sti
Jan 1, 2006
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Ground Control and Safety Implications of Blast Damage in Underground Mines
By Stephen Iverson
The National Institute for Occupational Safety and Health (NIOSH) is currently performing research to help mine operators minimize the amount of loose or damaged rock surrounding a blasted opening. I
Jan 1, 2007
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Towards an Improved Stone Mine Pillar Design Methodology: Observations from a Mistake
By Francis Kendorski
The mining engineering design professional has limited practical and reliable tools for planning successful room-and-pillar stone mines using readily-available and collectible information. Three tech
Jan 1, 2007
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Yield Pillar Behavior At Jim Walter No. 7 Mine Stress And Strata Measurements Of Yield And Abutment Pillars
By J. Brasfield
Jim Walter Resources, along with the Rock Mechanics Branch of British Coal and Strata Control Technology Pty. Ltd., is presently studying the yield-stable-yield pillar design in use at the Blue Creek
Jan 1, 1994
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New Developments In Headed Rebar Ground Support (e1369dc5-cd64-41ac-8b6d-861d8d628824)
By Roland C. Walker
Traditional headed rebar has existed in the mining industry as a ground support product for many years. The head of a rebar bolt is most commonly produced by hot upset die forging. Upset die forging
Jan 1, 2009
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Geotechnical Assessment Of Skin Reinforcement In Underground Mines (f05de68f-e8c8-43ca-aab9-9a65452cc10f)
By Jan A. Nemcik
Steel mesh has been used successfully for many years to control friable roof conditions and prevent loose roof and rib material from caving into the roadway. Despite its extensive use, the installati
Jan 1, 2009
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Modal Testing and Dynamic Finite Element Analysis of a Roof Bolter?s Drilling Boom
By Youzhen Zhang
The drilling boom is the key component of a roof bolter, and it has significant impact on the performance, safety, and reliability of the overall working device. In this paper, the experimental modal
Jan 1, 2012
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Historical Perspective And Future Projection Of Longwall Mining In The United States (19eaaffe-326c-46a4-9a81-dc104b2df560)
By Thomas M. Barczak
This report chronicles the historical development of longwall mining in the United States and speculates on future developments to the turn of the century. Five eras of technological development durin
Jan 1, 1992
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Coal-Mining-Induced Seismicity in Utah?Improving Spatial Resolution Using Double-Difference Relocations
By Kristineq Pankow
The August 2007 Crandall Canyon mine disaster raised national awareness of mining-induced seismicity (MIS) in Utah as well as general interest in how seismic monitoring might improve mine safety in th
Jan 1, 2008
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Experimental and Numerical Study of Double Shearing of Bolt under Confinement
By Naj Aziz
The shear behaviour of reinforced rock joints is investigated for the bolt-grout-rock interaction and for failure mechanism. The effectiveness of the bolt application under lateral and axial loading c
Jan 1, 2007
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Effects of Specimen Age on the Uniaxial Compressive Strength and Moisture Content of Weak Coal Measure Rocks
By Timothy Barton
The uniaxial compressive strength (UCS) is the most fundamental measurement used in geotechnical rock characterization for mine design. While there are standardized procedures for how to conduct UCS
Jan 1, 2008
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Geology, Ground Control, and Mine Planning at Bowie Resources, Paonia, CO
By Collin Stewart
Bowie Resources maintains one of the most pro-active ground control programs in the U.S. mining industry today. Its guiding philosophy is that everyone in the organization, from the miners at the fac
Jan 1, 2006
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The Use of Strata Management Techniques for the Optimisation of Secondary Support in Longwall Installation Roadways at United Colliery, NSW, Australia
By Kieran Black
The immediate roof lithology at United Colliery is extremely variable and provides a challenge for the design of secondary support. Support design in recent longwall installation roads at the mine has
Jan 1, 2007
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A First Step in Developing Standing Roof Support Design Criteria Based on Ground Reaction Data for Pittsburgh Seam Longwall Tailgate Support
By Thomas Barczak
Roof support systems are designed for roof control to prevent unplanned falls. It sounds logical and has been the conventional thinking in support design since supports were first installed. In orde
Jan 1, 2008
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Development of Timedependent Surface Subsidence Over the Total Extractions Areas of the Potash Beds Stoped with Interchamber Yield Pillars
By M. P. Nesterov
The method of predicting the time-dependent surface subsidence for gently-inclined potash deposits where total extraction using various sizes of yielding bamier pillars was discussed.
Jan 1, 1998
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Comparison among the Conventional Fully-Grouted Bolt, Combination Bolt, and One-Step Bolt Using Numerical Modeling
By Andre Zingano
The objective of this paper is to compare the behaviors of different types of roof bolts: (1) One-Step Bolt (OSB), (2) Fully grouted Bolt (RB), (3) Combination Bolt (CB), and (4) Torque tension Bolt
Jan 1, 2007
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Practical Strata Management, Beltana No. 1 Mine, Australia
By Shane McDonald
Australia produces approximately 84 million tonnes of coal per annum from 30 longwalls in New South Wales and Queensland, operating at an average depth of around 300m. Industry trends and expectations
Jan 1, 2008
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Indian Experiences Of Mechanised Coal Pillar Extraction (b04565f5-fd0b-4a80-a8aa-fcb98125fe52)
By Arun Kumar Singh
Wide variation in the nature of the coal seams and the surrounding rock mass of the Indian coalfields and very little information about the associated stress fields were observed to be the major hurdl
Jan 1, 2009