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Reformation Of The Hydraulic Stowing Mining Method (81b9f573-b6ec-447f-bbcd-728c29bd41c4)
By Liang Yinhuai
The hydraulic-stowing mining method is most effective for mining thick coal seams. It is superior to the sliced cover-caving and artificial mining method and the fully mechanized sublevel-caving minin
Jan 1, 1992
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A Cooperative Study Of Gate Entry Designs Welbeck Colliery (UK) And Jim Walter Resources (USA)
By Greg Hendon
Longwall developments in the UK have historically consisted of single entry gate roads. Adjacent developments were separated from existing panels by large barrier pillars (designed of sufficient width
Jan 1, 1995
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Design Aspects In Multiple-Seam Mining: Case Studies
By Gregory J. Chekan
Developing a coal seam that has been influenced by previous mining in seams either above or below can result in severe ground control problems. In many instances, interactions between operations are i
Jan 1, 1990
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Dynamic Failure in Coal Seams: Implications of Coal Composition for Bump Susceptibility
By Arthur Miller, Andrew Weakley, Heather E. Lawson
"IntroductionDynamic failure events in an underground coal mine, or “bumps,” are defined as “the sudden, violent bursts of coal from a pillar or pillars or a block of coal, resulting in a section, the
Jan 1, 2015
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Geotechnical Constraints On A 6 M Single Pass Longwall
By Ross W. Seedsman
The feasibility of 6 m high single pass longwalling has been studied using Newlands Mine as a case study An intensive geological investigation identified a range of hazards but a mine layout was possi
Jan 1, 1992
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A New Rockbolt Axial Load Measuring Device
By Hani Mitri
A new monitoring device called SAFEBOLT (Stress And Force Evaluator in Bolts) has been recently developed. The device SAFEBOLT, essentially replaces the load cell, it permits the monitoring of bolt a
Jan 1, 2001
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SDPS For Windows: An Integrated Approach To Ground Deformation Prediction
By David Newman
The latest version of the Surface Deformation Prediction Software (SDPS) package is presented through its application to a number of case studies. The package now exploits all the benefits of the Micr
Jan 1, 2001
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The Use Of Geologic Modeling In The Prediction Of Adverse Roof Conditions
By Edward S. Custer
Recent investigations of mine roof falls have demonstrated that roof failures are generally associated with geologic conditions. The roof falls can be predicted by using the techniques of depositional
Jan 1, 1981
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Pillar Sizing
By Marek J. Mrugala
Coal strength based on scaled uniaxial compressive strength from the laboratory and back calculations from in-mine observations of pillar stability indicate that material strength scaling rules are op
Jan 1, 1989
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Stability Of Interpanel-Pillar And Deformation Of Gateroad Due To Longwall Mining
Retreat longwall method with re-use of gateroad has been traditionally employed in Japan, mainly because of the advantage of higher recovery. But the Miike Colliery has newly introduced the interpanel
Jan 1, 1990
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Abutment Pillar "Notching" Improves Abutment Tunnel Roof Conditions At The Cayuga Rock Salt Mine
By David B. Plumeau
The Cayuga Mine, a deep rock salt mining, operation, changed from a standard room and pillar mine design to a yielding pillar/pressure arch design five years ago. In general the roof conditions improv
Jan 1, 1981
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Development And Evaluation Of A Floor-Bearing Capacity Test Apparatus
By Daniel W. H. Su
A floor-bearing capacity test apparatus was designed and constructed to determine the true bearing capacity of soft floor materials beneath coal pillars or longwall face supports. The apparatus has be
Jan 1, 1993
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The Application of Pre-tensioned Grouted Tendons at Harworth Colliery, UK
By Chris Adams
The application of pre-tensioned tendon roof support assisted Harworth Colliery in their revival, from impending closure to lowest cost deep-mined producer in the UK, over just six months last year. T
Jan 1, 2003
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Effects of Panel Mining Sequence and Retreat Direction on the Roof Stability of Longwall Headgate Entries
By Jinsheng Chen
The major functions of longwall headgate entries are to provide access ways to the outby submains or mains for coal transportation and to the longwall face for fresh air and for transporting men and m
Jan 1, 1998
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Crosshole Seismics: Applications In Mining
By Richard E. Thill
Two Cross-borehole systems were developed by the Bureau of Mines, one operating at a central frequency of 20 kHz for close-in spacing between boreholes (2-20m) and another operating at a dominant freq
Jan 1, 1989
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The Design of Room and Pillar Mining Systems in the UK
By Graham Daws
State of the Art Room and Pillar mining techniques have been employed at two coal mines in the UK in the last two years. This paper describes the design of pillars and rockbolted support systems for R
Jan 1, 1998
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Landslide Occurrence and Causation in Steep Slope Areas of Appalachia
By David Newman
Landslides and soil creep often occur with varying degrees of severity on steep slopes within Southern Appalachia. Ground movement may take place over years with subtle changes in topography and veget
Jan 1, 1998
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Safe Pillar Extraction Practice - Some Geotechnical Principles Based on Australian Experience
By Bruce K. Hebblewhite
Underground pillar extraction continues to be practiced in Australia in various forms, in spite of the dominance of the longwall method, which accounts for over 90% of underground production. Australi
Jan 1, 2011
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Chinese And North American High-Extraction Underground Coal Mining Strata Behavior And Water Protection Experience And Guidelines
By Mao Bai
Mining in situations where there exists a potential hazard from inundation has always existed in coal mining, and often reserves were left unmined in favor of reserves with no such hazard. However, in
Jan 1, 1995
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Simplified Pre-and Post-Processing Technique for Performing Finite-element Analyses of Deep Underground Mines (4c70a887-9438-4254-8d3e-3283730c59e0)
By Marc T. Filigenzi
Two of the major ground control safety issues confronting underground mine operations today are shaft pillar stability and the failure of rock around active mine openings. Failure of a mine shaft can
Jan 1, 1997