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SME-ICGCM (1801)
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TITLE Mapping and Application of Roof Joint Patterns for Ground Control inAn Illinois Mine
SUMMARY Ananalysis of the Roof Falls Data Base (RFDB) for underground coal mines in Illinois for the period 2004?2008 indicated that about 80% of the roof falls occur at intersections and are associated with geologic anomalies or a rapidly changing geologic environment. Most falls are associated with anomalies such as clay dikes, differential compaction faults, shear zones, joints and fractures, and geologic structure. Therefore, a better analysis of the geology with emphasis on mapping anomalies such a...
AUTHOR Basnett, Kenny D.
TITLE Surface Subsidence Velocity of Fully-Mechanized Thick Seam Top Coal Caving Mining
SUMMARY Surface subsidence for fully mechanized thick seam top coal caving was measured, and surface subsidence characteristics were then analyzed. The subsidence initiation distance from the set-up room and the advance influence distance ahead of the advancing longwall face were studied. The maximum surface subsidence velocity and the delay angle of the maximum subsidence velocity were determined. The results indicated that surface movement was intensive, the surface subsidence velocity was very high, ...
AUTHOR Guo, Wenbing
TITLE Applications of ARMPS (Version 6) to Practical Pillar Design Problems
SUMMARY The Analysis of Retreat Mining Pillar Stability (ARMPS) program has been used to evaluate room and pillar retreat mining layouts since it was first released in the mid 1990s. After the Crandall Canyon mine disaster focused attention on the importance of pillar design, ARMPS became an essential component in most Roof Control Plans developed by mine operators. In 2010, NIOSH released ARMPSversion 6, which features a ?pressure arch? loading model for deep cover room and pillar mining. NIOSH has als...
AUTHOR Mark, Christopher
TITLE Recent Innovations for Slope Development
SUMMARY Patton Mining, LLC and J.H. Fletcher Company recently collaborated and mechanized the sometimes hazardous, and always labor intensive, process of installing standing steel supports during the construction of a slope entry of a new mine. The new innovation is a beam setting machine design that can lift and maneuver heavy steel beams into place over and around the belt and vent tubing. In addition, the machine is designed with an integral double extending lifting work platform to allow workers a s...
AUTHOR Burgess, Tim
TITLE Engineering Geophysics - Mine Subsidence Risk Assessment Study
SUMMARY Abandoned mines pose a serious threat to public health and safety, as well as the environment. When active workings approach old mine workings, miners could encounter significant hazards. Additionally, the presence of mined-out areas or voids underlying residential/commercial properties, transportation, and infrastructure systems can cause subsidence issues ranging from differential settlements and sinkholes to catastrophic collapse. All these features can result in adverse impacts in terms of c...
AUTHOR Hanna, Kanaan
TITLE The Introduction of Uk Rockbolting Technology into Coal MinesAround the World
SUMMARY The introduction of UK rock bolting technology has been applied in many large underground coal mines around the world. This paper explains the methods that have been applied for its successful introduction and discusses several case studies. It does not give fine detail but is intended to allow decision makers to gain a basic understanding of the method used to introduce rock bolting to a mine.
AUTHOR Daws, Graham
TITLE Investigation Into Abnormal Surface Subsidence Above a Longwall Panel in the Southern Coalfield, Australia
SUMMARY The subsidence over a longwall panel at Tahmoor Mine in the Southern Coalfield of NSW, Australia, was found to be approximately twice the size it had been in previousmeasurements. An investigation into the potential causes was conducted using computer modeling together with hydrological characterization and detailed geotechnical characterization of the strata. The abnormal subsidence was found to be consistent with localized weathering of joint and bedding planes above a depressed water table a...
AUTHOR Gale, Winton J
TITLE Streams and Longwall Coal Mining Subsidence: A Pennsylvania Perspective
SUMMARY Longwall mining produces surface subsidence basins that affect streams by water diminution and contamination. These effects can ultimately impair the biological character of the plants and animal communities living in the streams. The combination of flow, water quality, and ecological effects threaten the environmental sustainability of longwall mining and, ultimately its social acceptability. Pennsylvania has developed new standards, released in 2005 and implemented in 2007, to help protect the...
AUTHOR Iannacchione, Anthony T
TITLE MSHA Technical Review of Proposed Mine Designs for U.S.Underground Coal Mines
SUMMARY Ground fall injuries and fatalities in United States underground coal mines have shown a diminishing trend. Advances in bolting and standing support systems have led to improved safety in underground coal mines. However, the Crandall Canyon Mine disaster in 2007, in which 9 individuals were fatally injured as a result of a widespread collapse, emphasized that proper mine design is a critical issue that must be addressed. The Mine Safety and Health Administration (MSHA) has instituted technical r...
AUTHOR Gauna, Michael
TITLE Protecting Underground Coal Miners From Rib Falls
SUMMARY In 2010, the number of fatal rib falls in U.S. underground coal mines exceeded fatal roof falls for the first time ever. While recent trends have seen roof fall fatalities reduced by about 62% since the 1990s (from an average of 9.6 per year in the 1990s to 3.6 per year during the last five years), the incidence of rib fall fatalities has remained approximately constant (about 1.5 per year). In addition, injury incidents associated with pillar rib failure have been steady at approximately 100 pe...
AUTHOR Gauna, Michael