Assessment of roof fall risk in longwall coal mines
نویسندگان
چکیده
منابع مشابه
Methods for determining roof fall risk in underground mines
Reducing the number of roof fall injuries is a goal of the NIOSH mine safety research program. Central to this effort is the development of assessment techniques to help identify the nature of the risks associated with working under potentially hazardous roof conditions. This paper discusses a method to determine the roof fall risk using a qualitative risk-analysis technique. The ability to det...
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Mine roof fall characteristics of 250 falls in 5 different room-and-pillar coal mines, located in Pike, Martin, and Floyd counties, Kentucky, were investigated to determine the relationship of selected parameters associated with roof failure and the assumed condition of the mine roof before failure. The selected parameters used in the study included: presence of cracks and water before the occu...
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Approximately more than 90% of all coal production in Iranian underground mines is derived directly longwallmining method. Out – of – seam dilution (namely 20–30%) is one of the essential problems in these mines.Therefore the dilution can impose the additional cost of mining and milling. As a result, recognition of the effectiveparameters on the dilution has a remarkable role in ind...
متن کاملOverview of coal mine ground control issues in the Illinois Basin
Some of the most difficult coal mine roof in the United States can be found in the Illinois Basin. Factors contributing to the high roof fall rate include weak, moisture-sensitive roof rock; high horizontal stress; and limited longwall mining. The depth of cover ranges from 27 to 300 m (90 to 1,000 ft), and roof damage from horizontal stress can be severe. Moisture-sensitive roof rock, which co...
متن کاملPreventing Falls of Ground in Coal Mines with Exceptionally Low-Strength Roof: Two Case Studies
Mines with exceptionally low-strength roof (UCS <3,500 psi and CMRR <40) are much more likely to struggle with roof falls than other mines. Weak roof is a particular problem for many room and pillar mines in the Midwestern and Northern Appalachian coal basins. Traditional roof support techniques are often not up to the challenge at these operations. This paper focuses on two mines, one operatin...
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ژورنال
عنوان ژورنال: International Journal of Mining, Reclamation and Environment
سال: 2016
ISSN: 1748-0930,1748-0949
DOI: 10.1080/17480930.2016.1200897