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An Engineering Analysis Of "Squeeze" Failure Of Pillars In The Pittsburgh Coal Bed
By George Mishra
In mid-1979, J&L Steel Corporation experienced rapid failure of pillars after only two weeks' operation with a combination of full retreat and partial mining in the 154 Road Section of its Nemaco
Jan 1, 1981
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Evaluating Techniques for Monitoring Rock Falls and Slope Stability (03558dcc-00ee-4336-8044-b80294644df0)
By Edward McHugh
While less than 1% of reported accidents are associated with slope stability problems. slope failures were responsible for about 15% of all U.S. surface mine fatalities between 1995 and 2001. Small ro
Jan 1, 2002
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Application Of A Static And Geophysical Monitoring System For Detection Of Stability Problems
By Maleki. Hamid
The U.S. Bureau of Mines implemented an inte¬grated static and geophysical monitoring program in a southern Wyoming mine to study changes in seismic wave propagation properties in roof strata. The pur
Jan 1, 1993
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Hazard Mapping Combining Geostatistical Modeling Of Coal Mine Roof Quality Ratings With Numerical Modeling Of Stress Data
By J. Riefenberg
U.S. Bureau of Mines (USBM) researchers are developing a personal computer-based hazard mapping system for use in underground coal mines. Hazard mapping is rapidly gaining interest as delineating area
Jan 1, 1994
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Stereological Sampling And Analysis For Characterizing Discontinuous Rock Masses
By J. K. Owens
As part of a larger research effort focused on ground control, the U.S. Bureau of Mines is currently evaluating the effectiveness of using stereological analysis for characterizing mine roof strata. I
Jan 1, 1994
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Longwall Stability Analysis Of A Deep, Bump-Prone Western Coal Mine-Case Study
By Lance R. Barron
The U.S. Bureau of Mines, in cooperation with a central Utah coal .mine operator, began a study in July 1988 into longwall gateroad designs applicable to deep, bump- prone mine conditions. Prior to th
Jan 1, 1990
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Options to Control Groundwater-Based Georisks along Geological Faults in the Large Scale Area of Influence of an Open Pit Mine
By Markus Papst, Denise Millier, Daniel Beckers, Axel Preusse
"At an open-pit lignite extraction mine in Germany, groundwater has to be pumped over a large area, which leads to subsidence at the surface. As long as the geology of the area of influence is homogen
Jan 1, 2016
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Automation Of A Progressive Failure Procedure For Analysis Of Underground Mine Pillar Designs
By N. P. Kripakov
The U.S. Bureau of Mines (USBM) is conducting research to develop a practical computer-based tool that will allow coal mine planners to anticipate rock mass behavior surrounding mine entries prior to
Jan 1, 1994
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Analysis And Field Testing Of Presupport Application In Coal Strata
By J. D. Dizon
Conventional strata control methods (i.e. roof bolts. cable trusses) are not always effective for ground control of very weak coal strata. An alternative method, termed presupport. is being investigat
Jan 1, 1990
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Resin-Grouted Cables For Longwall Tailgate Support Stability
By Stephen C. Tadolini
The U.S. Bureau of Mines (USBM) is conducting research to provide alternatives for traditional secondary support methods. These cost-saving methods are proving to afford safer installation, improve en
Jan 1, 1994
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An Investigation Of Longwall Pillar Stress History
By M. G. Schuerger
The United States Steel Mining Company, Inc., (USM) Lynch District, operated the No. 37 Mine in the Harlan coal seam, Harlan County, Kentucky, from 19'2 until its sale to Arch of Kentucky in 1984
Jan 1, 1984
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Development of An Online User’s and Training Manual for LaModel
By Keith A. Heasley, Christopher R. Newman
"Originally developed in 1993, LaModel has aided mining engineers and researchers alike in improving the design and safety of underground single- and multiple-seam mining operations (Heasley, 1998). T
Jan 1, 2015
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A New Generation of Web-Based Applications for Mine Design
By Nathaniel Schaefer, Christopher Newman, Zach Agioutantis
"As mining reserves continue to be developed in deeper and more complex geological and geometric conditions, there has been an increased demand for underground mine designs to better reflect site-spec
Jan 1, 2017
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Assessment Of Wood And Alternative Materials For Supplemental Roof Support Construction
By Thomas M. Barczak
The engineering of a support system is driven largely by economics. The goal is to provide effective support at minimal cost. For this reason, wood has been extensively used as a support material for
Jan 1, 1994
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Effect of High Horizontal Stress on Coal Mine Entry Intersection Stability
By K. Hanna
This manuscript describes an extensive ground control study at the Inland Steel No. 2 Mine near McLeansboro, IL, conducted by the U.S. Department of the Interior's Bureau of Mines (USEM) in coope
Jan 1, 1986
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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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The Initial Performance of Commonly Used Primary Support on U.S. Coal Mines
By Murali Gadde
U.S. coal mines? primary roof supports typically consist of passive resin bolts; however, the use of active bolt systems is increasing. Despite this widespread use, a comparative performance evaluatio
Jan 1, 2011
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Integrating Ground Control And Mine Site Data Through A Geographic Information System
By Douglas C. Peters
Part of the ground control research at the U.S. Bureau of Mines is involved with improving ground control data collection and analysis methods. A geographic information system (GIs) is being used with
Jan 1, 1990
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Geotechnical Aspects of Subsidence over Room and Pillar Mines in Illinois
By Gennaro G. Marino
Site conditions at several shallow room and pillar mines in Illinois are described and compared with the charac¬teristics of the subsidence profiles at the ground surface. The shape and magnitude of t
Jan 1, 1984
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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