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SME-ICGCM (1801)
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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 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 Inflatable Rock Bolt Bond Strength vs. Rock Mass Rating (RMR): A Comparative Analysis of Pull-Out Testing Data from Underground Mines in Nevada
SUMMARY "Inflatable rock bolts are commonly utilized for ground support in Nevada underground mines, however, there is limited information regarding what factors influence the bond strength of these bolts. Bond strength is an important parameter in friction bolt support design, and this information is usually not available from manufacturers as a standard. Previous research has investigated the bond strength of friction bolts; however, these studies focused primarily on split set bolts and ground condit...
AUTHOR Barnard, Chase K. (primary); Kallu, Rajagopala ; Warren, Sean ; Thareja, Rahul
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 Dynamic Failure in Coal Seams: Implications of Coal Composition for Bump Susceptibility
SUMMARY "IntroductionDynamic failure events in an underground coal mine, or“bumps,”are defined as“the sudden, violent bursts of coal from a pillar or pillars or a block of coal, resulting in a section, the whole pillars, or the solid block of coal being thrown into an open entry”(Peng, 2008). Reports of disastrous and often fatal dynamic failure events date back over one hundred years in the United States. Mining practices and technologies have significantly evolved over the course of the last century, ...
AUTHOR Lawson, Heather E. (primary); Weakley, Andrew ; Miller, Arthur
TITLE Underground Measurement of Gateroad Stability at the Depth Around 1000m
SUMMARY "The Carboniferous coal measures, mined across Europe including the major European underground coal mining countries of Poland, UK, Germany, and Czech Republic, suffer from increasing extraction depth. This results in major geomechanics problems associated with ground control and support design.With production being concentrated into ever fewer high performance longwalls, located at greater and greater depth, pressure to ensure the roadways’functionality (required dimensions) continues to increa...
AUTHOR Lubosik, Zbigniew (primary); Prusek, Stanislaw ; Wrana, Aleksander ; Walentek, Andrzej
TITLE Measurements of Horizontal Shear Movements Ahead of Longwall Mining and Implications for Overburden Behaviour
SUMMARY "An underground coal mine located in New South Wales has a target coal seam located 160-180 m deep directly below a 16-20 m thick conglomerate unit that has been associated with significant periodic weighting events on the longwall face. As part of the investigations to better understand the causes of periodic weighting at the mine, inclinometers capable of measuring horizontal shear movements through the full section of the overburden strata were installed ahead of mining at two locations appro...
AUTHOR Mills, Ken W. (primary); Puller, Jesse ; Salisbury, Owen
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 Laboratory Studies on Creep Behavior of Grouted Tensioned Rebar in Weak Strata
SUMMARY "Primary roof support in underground coal mines in the USA consists mostly of fully grouted passive rebar or grouted (partially or fully) tensioned rebar. Research conducted at two room-and pillar coal mines in the Illinois Basin and one longwall mine in Colorado monitored the performance of these passive and active rock bolts under similar geologic and mining conditions and found no significant initial loads in either passive or active rock bolts (Spearing et al., 2011). Active rock bolts showe...
AUTHOR Spearing, Anthony (Sam) J. S. (primary); Mishra, Aditya ; Tirumalaraju, Naga S. Y. ; Hirschi, Joseph
TITLE How Interface Friction and W/H Ratio Affect the Mode of Failure of Coal Specimens
SUMMARY "Bumps in coal mines have been recognized as a major hazard for many years. These sudden violent failures around mine openings have compromised safety, ventilation and access to mine workings. Previous studies showed that the violence of coal specimen failure depends on both the interface friction and width-to-height (W/H) ratio of a coal specimen. The mode of failure for a uniaxially loaded coal specimen or a coal pillar is a combination of both shear failure along the interface and compressive...
AUTHOR Rashed, Gamal (primary); Peng, Syd