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Design Considerations For Bump-Prone Longwall Mines
Tailgate pillar and tailgate-face corner humps have been a major threat to longwall coal mines where hump-prone conditions exist. The yield pillar design concept, in which the longwall chain pillars a
Jan 1, 1999
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Pumpable Roof Supports: Developing Design Criteria by Measurement of the Ground Reaction Curve (8ba91e71-c09d-4bd5-afc0-848b526c152b)
By Thomas Barczak
Pumpable roof supports provide an alternative longwall tailgate roof support and have grown in usage during the past few years. Heintzmann Corporation has been installing pumpable roof supports at the
Jan 1, 2003
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The Search For A Method To Provide Warning Of Coal And Gas Outbursts
By Fred Leighton
Outbursts, or the sudden and sometimes catastrophic expulsion of coal and gas into the working area of a coal mine, are a little understood and growing problem. The AE/MS (Acoustic Emission/Microseism
Jan 1, 1982
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Progress In The Knowledge Of Granite Cutting With Diamond Wire (bf80b832-f557-4b46-b5c9-31193e67bf2d)
By A. Bortolussi
The paper discusses the state of the progress reached in the development of the diamond wire tool for cutting hard rocks. To the advances of this relatively new technology a substantial contribution h
Jan 1, 1992
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Impact Of Horizontal Load On Shield Supports
By Thomas M. Barczak
A theoretical evaluation of the impact of horizontal load on shield support capacity is made from a static rigid body analysis of the shield structure. Parameters affecting horizontal support resistan
Jan 1, 1984
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Design, Construction And Performance Of A Single Pass Lining For Soft Ground Coal Mine Tunnel Entries
By Donald P. Richards
West Elk Coal Company operates its Mt. Gunnison No. I mine on the western slope of the Rocky Mountains in Western Colorado. The mine is located along the north fork of the Gunnisson River near Somerse
Jan 1, 1984
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Engineering Methods For The Design And Employment Of Wood Cribs
By Thomas M. Barczak
Wood cribs are used extensively to stabilize mine openings by providing resistance to deflections of the immediate roof and floor and by supporting the weight of unstable rock masses. While the unit c
Jan 1, 1993
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Subsidence Prediction Influence Assessment and Damage Control
By Y. Luo
An extensive subsidence research program conducted by the authors has greatly improved the accuracy and the capabilities of subsidence prediction under complicated mining and surface conditions. The t
Jan 1, 1997
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An Investigation of the Causes of Cutter Roof Failure in a Central Pennsylvania Coal Mine: A Case Study
By John L. Hill
Cutter roof failure is a specific type of ground control problem which frequently results in massive roof failure. It is a cannon occurrence in coal mines of the Northern Appalachian Coal Sasin, causi
Jan 1, 1984
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Determination Of Rock Strength Properties Using Geophysical And Ultrasonic Logging In Exploration Drill Holes
By John Feddock
This study deals with underground mines and ground control and the prediction of seats strength characteristics based upon ultrasonic logging. Exploration drill holes, both rotary and core holes are u
Jan 1, 2003
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Thrust Bolting: A New Innovation In Coal Mine Roof Support
By Stephen C. Tadolini
A new innovation in coal mine roof support has been developed by the Bureau of Mines at the Denver Research Center. The technique, called "Thrust Bolting,"1 converts a traditional passive roof support
Jan 1, 1990
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Mining Under Rivers In Fuxin Coal Mines
By Liang Yin-Huai
In Fuxin Coal Mines, there are more than 20 million tons of coal buried under seasonal streams. The coal seams are mostly shallow. We have mined more then 50 mining blocks distributed in 5 coal mines.
Jan 1, 1990
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Analysis of Geologic and Geotechnical Conditions and Their Effects on Longwall Mining to Optimize Mine Planning at Shoal Creek Mine
By Yong-Ming Jiang
In cooperation with Cyprus Twentymile Coal Co., researchers from the National Institute for Occupational Safety and Health (NIOSI-I), Spokane Research Laboratory, conducted a study at the Foidel Creek
Jan 1, 1998
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Monitoring and Prediction of Ground Movements Above Underground Mines in the Eastern United States
By M. Karmis
mining factors and representative ground movement parameters. Based on this analysis, the previously developed prediction methods were modified and tested for their applicability in the Appalachian co
Jan 1, 1987
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Design Procedure for Arch Canopies for Rehabilitation of High-Roof-Fall Areas
By Richard A. Allwes
A procedure is presented for the design of an arch canopy for the application of rehabilitating a high-roof-fall area. This procedure is specifically developed for evaluating an unbackfllled arch cano
Jan 1, 1986
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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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The Massive Collapse Of Coal Pillars - Case Histories From The United States
By Frank E. Chase
A massive pillar collapse occurs when undersized pillars fail and rapidly shed their load to adjacent pillars which in turn fail. This chain reaction-like failure may involve hundreds, even thousands,
Jan 1, 1994
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Improved Design Of Coal Pillars For U.S. Mining Conditions
By Z. T. Bieniawski
This paper presents the results of a survey of room and pillar dimensions and design practice in U.S. coal mines aimed at improving the design procedures in room and pillar mining. A review is given o
Jan 1, 1981
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Evaluation Of Surface Subsidence Potential Along A Pipeline Due To Abandoned Coal Mine Works
By Thomas L. Vandergrift
With the inevitable expansion of homes, businesses, and infrastructure in coal mining regions, the potential for future subsidence above abandoned mines is of increasing concern. Of particular concern
Jan 1, 2000
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Empirical and analytical design of large openings at a proposed national underground science laboratory
By Karl Jr. Zipf
The famous Homestake gold mine in Lead, SD. closed recently alter 125 years of operation. However, the mine may receive a new lease on life as a National Underground Science Laboratory (NUSL) supporte
Jan 1, 2002