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Probabilistic Analysis of Blasting Impact on Open Pit Stability (95ce6127-68ed-453f-9268-476a1af1dd45)
By Dae S. Young
A new probabilistic approach is introduced for slope stability analysis including adverse impact of blasting vibrations. The material strength within a slope area is randomized in this bi-variate join
Jan 1, 1984
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Controlled Blasting During Drifting In Hard Rock Mine
By S. P. Singh
Drifts are an integral component of underground mining. They provide access for men and material, means for transporting ore and rock and serve as air passageways. In view of their importance on the o
Jan 1, 1990
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Seismic Studies Over Active Longwall Mines
By Thomas H. Wilson
Common offset and refraction seismic data have been collected over four longwall panels at two different locations within West Virginia. Surveys prior, during and after mining were made in both areas.
Jan 1, 1988
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Coal Pillar Design Formulae Review and Analysis
By Xinzhi Du
Coal strength is essential to analyze the stability of excavation in coal. It is well known that the strength of coal tested in the laboratory is size-dependent, and different size specimens will prod
Jan 1, 2008
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Top Coal Failure Mechanism Of Extremely Thick Seam In Top Coal Caving Mining (b4774a45-fd0f-4916-8ea9-0dac0bf96077)
By Nan Hua
As a high production and high efficient mining method, top coal caving method is now widely used in China. However, as more extra-thick coal seams are mined, it becomes more and more difficult to make
Jan 1, 2009
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Ground Control for Muliple Seam Mining in German Coal Mines
By Holger Witthaus
There is more than a century of experience in multiple seam mining in Germany. In several mines up to 20 seams had been excavated within the last decades. Due to the nature of the deposit and the hist
Jan 1, 2007
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Longwall Shield Recovery Using Mobile Roof Supports (64264c53-830d-4e84-b91e-78532103884a)
By Frank Chase
Longwall mining has gained the reputation as being the safest extraction method in underground coal mines. However, one of the most difficult tasks associated with longwall mining is moving the face
Jan 1, 2007
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The Effects of Reduced Annulus in Roof Bolting Performance
By Stephen Tadolini
The annulus thickness, for bolts anchored with resin, effects the systems final performance. Recent developments in the manufacturing process of these support systems, coupled with improved resin char
Jan 1, 1998
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A Method for Sizing Longwall Pillars Based on Field Measurements
By Christopher Mark
A new method for the design of longwall pillars, called "Analysis of Longwall Pillar Stability" (ALPS), is described. The method is the final result of a research program that included two major field
Jan 1, 1987
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Optimizing Pillar Design In A Multi-Seam Environment
By R. Kanniganti
The primary problems of pillar design in seams subject to interaction are due not only to difficulties in predicting loading, but also to the often unsymmetrical nature of the stress fields. The effec
Jan 1, 1995
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Evaluation of a Multiple Seam Interaction Coal Pillar Bump
By Michael Gauna
An evaluation and analysis of a coal pillar bump in a West Virginia mine indicated that the pillar bump occurred because of the unique combination of controlling factors. The pillar?s development sta
Jan 1, 2008
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A Casting Method For Artificial Rock Specimens
By Da Zhao Gu
An important problem in rock engineering is to control the properties of artificial rock. A compaction technique for casting artificial rock specimens with controlled properties is described, i.e. usi
Jan 1, 1992
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Nonlinear Approach For Determining Design Criteria For Yield Pillar Performance
By W. Smith
The U.S. Bureau of Mines (USBM) is using laboratory and computer-based techniques to investigate the post- failure behavior of yielding pillars and pillar reinforcement techniques to control entry def
Jan 1, 1995
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Roof Pressure Monitoring Using The Integrated Longwalt Automation System By WESTFALIA
By Ulrich Paschedag
The WESTFALIA group of companies developer and manufactures underground mining machinery for complete high-performance longwalls. WESTFALIA uses a state of the art electrohydraulic system as the most
Jan 1, 1994
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A Statistical Analysis Of Falls Of Ground In South African Collieries
By Andre Vervoort
Falls of ground, such as falls of roof and sidewall collapses, are a major cause of fatalities and injuries in South African collieries. Based on information obtained from the accident reports of the
Jan 1, 1990
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Analysis of Cutting Bits and Cutting Drum Affecting Ground Control in Coal Mines
By A. Wahab Khair
Coal mining has evolved into extensive use of continuous mining machines for development and production. This has resulted in an increase in dependence on the versatile continuous miners. The present-
Jan 1, 2008
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Integration Of CAD-Based Mine Planning And Subsidence Engineering Systems
By Andrew P. Jarosz
The present computerized mine planning systems use CAD-like and Data Base Management System (DBMS) environments for the handling of numerical, textural, and graphical data. These two environments are
Jan 1, 1995
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The Design And Selection Of Powered Supports For Application In 4.5 Metre Extraction At Daw Mill Colliery
By Clive Chadbourne
Investigations of world wide coal face strata control practice, the study of theoretical calculations and detailed engineering analysis have been combined to design and select a powered roof support s
Jan 1, 1994
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Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines (08bccb54-5d4b-443a-860e-90b5a6841ec3)
By Gabriel S. Esterhuizen
A survey of pillar conditions was carried out at 21 operating limestone mines that use the room-and-pillar method. The surveyed pillars were all located in rock that was classified as ?Good? to ?Very
Jan 1, 2006
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Successful Application of Rock Bolt Support and Mechanised Depillaring in Difficult Roof Conditions at Tandsi Mine, Western Coalfields, India
By D. C. Oldroyd
Western Coalfield?s Tandsi Mine, has difficult support conditions and a history of roof falls, resulting in mining roadway widths and depths being restricted for safety reasons. Rock Mechanics Technol
Jan 1, 2006