Organization / Society
SME-ICGCM (1801)
Showing: 41 to 50 of 1801 matches for:
Search Criteria
Organizations
SME-ICGCM
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 Numerical Modeling of the Pillar Confinement with Backfilling Material in Room?and?Pillar Coal Mining
SUMMARY It is known that the backfilling confinement increases the pillar strength and also reduces the rib lateral displacement. With backfilling, it is possible to increase the room-and-pillar mining recovery. This paper aims to study the behavior of coal pillars confinement using rock fill as backfilling material. Laboratory tests were carried out to determine the behavior of backfilling materials. Constitutive models were developed for the tested backfilling materials. Numerical simulations for the ...
AUTHOR Zingano, Andre
PUBLISHED 2011
TITLE Roof Bolting for Long-Term Entries in Underground Coal Mines
SUMMARY As simpler and easier reserves are exploited to depletion, underground coal mining continues in more complex geologic settings and conditions. Roof bolting for long-term entry stability is always a challenge. For long-term entries of a mine such as belt, track entries and return airways, roof could be under-supported if one uses the same bolting plan as in short-term entries or even seem over-supported with increasing use of longer, stronger bolts along with mesh, pans, straps or trusses. In mos...
AUTHOR Zhang, Peter
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 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 Characteristics of Coal Bursts in the North Fork Valley of the Gunnison River Valley, Colorado
SUMMARY A coal burst is defined as the sudden, violent ejection of coal or rock into a mine opening. Coal mines in the North Fork Valley (NFV) of Colorado?s Gunnison River have a long history of coal bursts in a wide variety of settings. These have included longwall and room-and-pillar, development and retreat, and single- and multiple-seam mining. In contrast to other coalfields, where bursts are typically associated with strong, massive sandstone and extremely high stress, many bursts in the NFV have ...
AUTHOR Mark, Christopher
PUBLISHED 2012
TITLE Ultra-Close Multiple-Seam Mining ? Analysis and Verification
SUMMARY This paper presents the results of a detailed geotechnical study on the potential multiple seam interaction between the No. 2 Gas (upper) and the Powellton seams, which are separated by an average interburden of 45 ft. The interburden consists of 4 ft of clay shale below the No. 2 Gas seam, 38 ft of massive sandstone, and 3 ft of shale above the Powellton seam. The No. 2 Gas seam was mined about 60 years ago, and many water-pooled areas were projected to be present. The deepest overburden over t...
AUTHOR Su, Daniel W.
PUBLISHED 2012
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 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