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SME-ICGCM (1801)
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SME-ICGCM
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
PUBLISHED 2011
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
PUBLISHED 2011
TITLE Application of Stress, Geologic, and Support Design System (Sgssm) to Ground Control for Mine Slope Entries
SUMMARY Accurate evaluation of stress and geological conditions is critical to ground control design in underground openings. For a mine slope entry, the problem becomes more complicated because a slope transverses through many different types of strata. Mine slope ground control has traditionally been practiced based on trial and error and prior experience. There is currently no well-accepted slope and support design methodology available for an economical and technically sound ground control plan. Ove...
AUTHOR Stankus, John
PUBLISHED 2011
TITLE The Duncan Method of Partial Pillar Extraction at Tasman Mine
SUMMARY Mining commenced at Tasman Mine in late 2006. The current method of mining is bord and pillar using continuous minerbolters and shuttle cars for first workings and secondary extraction using mobile roof supports. The two stage process was chosen to accommodate irregularly shaped coal deposits, allowing adjustments to be made to extraction ratios for better management of subsidence and to maximize the efficiency of the operation. Following the completion of the first three full/partial extraction...
AUTHOR Mctyer, Kent D
PUBLISHED 2011
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
PUBLISHED 2011
TITLE The Duncan Method of Partial Pillar Extraction at Tasman Mine
SUMMARY Mining commenced at Tasman Mine in late 2006. The current method of mining is bord and pillar using continuous minerbolters and shuttle cars for first workings and secondary extraction using mobile roof supports. The two stage process was chosen to accommodate irregularly shaped coal deposits, allowing adjustments to be made to extraction ratios for better management of subsidence and to maximize the efficiency of the operation. Following the completion of the first three full/partial extraction...
AUTHOR Mctyer, Kent D
PUBLISHED 2011
TITLE Gateroad Support in the Czech and Polish Coal Mining Industry - Present State and Future Developments
SUMMARY The present state of Czech and Polish coal mining industry is presented at the beginning of the article. This paper will inform the reader of the general data concerning hard coal reserves? number of mines, number of miners, output, number of longwalls, productivity, depth of extraction, and extraction methods?in both countries. The main part of the paper describes the methods of gateroad development as well as gateroad support characteristics (support types, gateroad shape and dimensions, dist...
AUTHOR Prusek, Stanislaw
PUBLISHED 2011
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
PUBLISHED 2011
TITLE The Influence of Interface Friction and W/H Ratio on the Violence of Coal Specimen Failure ? A Comparison Between a Bump and Non?Bump Prone Mines
SUMMARY Violent failures of coal pillars, known in practice as coal mine bumps, have long been a subject of investigation. Many field investigations have considered geological conditions that create high stress in the pillar to be the main causative factor leading to bumps. In recent years, constraint at interfaces has been observed to be associated with the occurrence of coal bursts. This paper shows how interface friction and width-to-height (W/H) ratio affect the degree of violence of coal specimen ...
AUTHOR Prassetyo, Simon H
PUBLISHED 2011
TITLE Research on Mine Pessure Behaviors and Overlying Strata Movement Laws in Solid Backfill Mining Methods
SUMMARY Solid backfill mining, as a green mining technology, has the advantages of a higher resource recovery, less damage to the environment and the ability to dispose of waste underground. It has been applied successfully in the Xingtai and Xinwen mining areas in China. Strata behavior and the movement of overburden strata in this mining method are very different from fully mechanized longwall mining, which results in a natural caving, because the gob is filled with waste rock, fly ash and other back...
AUTHOR Yang, Shengli
PUBLISHED 2011