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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 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 Trail Mountain Mine: A Case Study For Improving Locations Of Mining-Induced Seismicity With Double-Difference Relocation
SUMMARY In October 2000, temporary seismographic stations were installed above the Trail Mountain Mine, Emery County, Utah, USA to supplement a regional network. Over seven months, 1826 mining-induced seismic events were recorded with a magnitude range of M 0 to M 2.2 (Arabasz et al., 2002, 2005). Routine event locations for this dataset cluster around the longwall mining activity during the recording interval. However, applying a double difference relocation technique to the routine locations sign...
AUTHOR Sonley, Eleanor
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 Ultra-Thick High-Production And High-Efficiency Longwall Mining Technique With Retreat Mining Along The Seam Dip Direction And Under Complicated Geological Conditions
SUMMARY In Chinese coal mines, extraction of deep, highly gassy soft coal seams sandwiched between soft floor and soft roof in complicated geology is commonly encountered. How to safely and efficiently excavate such seams is a very significant and important problem. It has been a focused research area in recent years. By combining the characteristics of fully mechanized longwall mining methods such as large cutting height and mining along the dip, an integrated method and technologies for the Zhangji C...
TITLE Coal Bumps And Odd Dynamic Phenomena - A Numerical Investigation
SUMMARY The Crandall Canyon accident investigation included an interesting and unexplained observation by rescuers that the ?barrier rib had shifted northward as a unit, as much as 10 feet.? This is not the first mention of such a movement, although such reports are rare. Historical accounts describe unusual movement and displacement of intact coal, cribs and timbers. Two movements of particular interest are the creation of gaps above coal pillars and falling of standing support elements without appa...
AUTHOR Whyatt, Jeffrey K.
TITLE The Forensics Of Underground Roof Falls
SUMMARY Underground roof falls can have devastating effects on the safety of operations personnel, and equipment, and seriously impact production. Immediate steps are usually taken to danger off and secure the area while clean-up efforts are designed and implemented. A critical step, often overlooked due to production demand, is the determination of - why the roof fall occurred so that additional occurrences can be avoided in future developments or what measures can be taken to identify areas that hav...
AUTHOR Tadolini, Steve
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 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