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Wednesday, May 6, 2020 | History

3 edition of Geologic hazards and roof stability in coal mines found in the catalog.

Geologic hazards and roof stability in coal mines

G. M. Molinda

Geologic hazards and roof stability in coal mines

by G. M. Molinda

  • 130 Want to read
  • 28 Currently reading

Published by U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory in Pittsburgh, PA .
Written in English

    Subjects:
  • Mine roof control.,
  • Coal mines and mining -- Safety measures.,
  • Coal -- Geology.

  • Edition Notes

    Statementby Gregory M. Molinda.
    SeriesInformation circular ;, 9466, DHHS (NIOSH) publication ;, 2003-152, Information circular (National Institute for Occupational Safety and Health) ;, IC 9466., DHHS publication ;, 2003-152.
    Classifications
    LC ClassificationsTN289.3 .M57 2003
    The Physical Object
    Pagination33 p. :
    Number of Pages33
    ID Numbers
    Open LibraryOL3708246M
    LC Control Number2003283549
    OCLC/WorldCa53316345

    Coal mines and mining -- Environmental aspects. See also what's at your library, or elsewhere. Broader terms: Coal mines and mining; Energy industries -- Environmental aspects; Mi. As the interval between the top of the coal and the immediate roof thickened, a 3 to 4 inch-thick coal "rider" formed at the top of the interval. Because the coal rider seam was close to the mine's immediate roof, it was mined as a part of the normal mining process, playing a part in the increased mining height of the MMU.

    The improvement in roof stability that could be expected from dewatering in advance of mining would have direct beneficial effects on such problems as lost production time and safety hazards. Potentially, such improvements in operating conditions could bring much larger economic benefits than would control of AMD.   A further 48 roof falls occurred with no lost days (MSHA, ).The coal mine roof rating (CMRR) classification was developed by Molinda and Mark () to quantify the geological description of mine roof into a single value that could indicate mine roof stability and be used in engineering design.

    We evaluate the possible factors contributing to surface subsidence due to abandoned room and pillar coal mines of southwest Indiana, where underground coal mining has been active since the 19th century. Because data were limited for older mines, we had to Author: Kelsey T. Crane, Terry R. West.   Stability of underground openings is a major concern for the safety and productivity. This paper relates to a field study conducted at a large underground limestone mine in Central Pennsylvania. Identification of hazards leading to ground failures and assessment of roof fall risks are important in mitigating injuries.


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Geologic hazards and roof stability in coal mines by G. M. Molinda Download PDF EPUB FB2

Information Circular Geologic Hazards and Roof Stability in Coal Mines Paperback – Novem by Gregory M Molinda (Author) out of 5 stars 1 rating. See all formats and editions Hide other formats and editions. Price New from Used from 5/5(1). @article{osti_, title = {Hillseam geology and roof instability near outcrop in eastern Kentucky drift mines.

Report of Investigations/}, author = {Sames, G.P. and Moebs, N.N.}, abstractNote = {The U.S. Bureau of Mines study was conducted in eastern Kentucky drift mines as part of an ongoing research program to characterize the outcrop barrier zone.

@article{osti_, title = {Geologic structures that affect coal-mine roof stability}, author = {Chase, F.E.}, abstractNote = {The US Bureau of Mines has investigated several geologic structures that plague underground coal mining. These structures have caused numerous roof falls and, consequently, many miners have been hurt or fatally injured.

Geologic hazards and roof stability in coal mines Personal Author: Molinda, G. (Gregory M.) Corporate Authors: a ground control problem that frequently results in massive roof failure, is common in coal mines of the Northern Appalachian Coal Basin, causing delays in production and posing a safety hazard to mine personnel.

The Bureau of M Cited by: 2. The Effects of Ancient Stream Channel De- posits on Mine Roof Stability: A Case Study. BuMines RI, 25 pp.

Hylbert, D. Delineation of Geologic Roof Hazards in Selected Coal- beds in Eastern Kentucky — With Landsat Imagery Studies in Western Kentucky and the Dunkard Basin (contract J, Moorehead State Univ.).

Accidental roof failures in coal mines can be caused by many factors including geologic defects in the roof rock, moisture degradation of roof, extreme loading.

Most of the clay veins in coal occur in the synclinal troughs, generally under sandstone roof. Cleat orientations measured in 18 underground mines showed that face cleats are perpendicular to the axial trends of the folds, and the butt cleats are parallel to the axial trends, indicatng structural control of the by: This paper covers geologic exploratory methods, data organization, and the value of collecting and interpreting geologic information in coal mines to enhance safety and production.

The implementation of the methods described above has been proven effective in predicting and mitigating adverse geologic conditions in underground coal : Mark Van Dyke, Ted Klemetti, Joe Wickline. roof that is highly valuable to roof support selection as well as to the development of a geologic model for the Upper B seam.

The CMRR map also serves as the foundation for a “stability map,” with the strongest roof contoured in green and the weakest in. The management of roof fall hazards in underground coal mines requires a comprehensive risk assessment methodology due to the number of uncertainties associated with the phenomenon.

The underground mines in the Zonguldak coal basin mainly suffer from large numbers of roof falls annually due to complex structural geology of the by: Suggested Citation:"13 Review of Ground Failure Prevention Research." National Research Council and Institute of Medicine.

Mining Safety and Health Research at NIOSH: Reviews of Research Programs of the National Institute for Occupational Safety and Health. Washington, DC: The National Academies Press. doi: / Over the past decade, the U.S. Bureau of Mines (USBM) conducted longwall gate road stability studies at four mines in the Book Cliffs and Wasatch Plateau Coalfields of Utah.

These operations are characterized by multiple-seam mining, abruptly varying cover depths to m (3, ft), and massive rigid sandstone units in the main roof or floor.

Molinda GM () Geologic hazards and roof stability in coal mines. US Department of Health and Human Services, Centers for Disease Control. western coal mines because they provide better ground stability than the three-entry systems previously used.2 In longwall mines, two sets of entries called "panel entries" (or "gate entries"), one on each side of the panel of coal to be mined, are driven from the main mine entries to the end of the panel.

They are then connected at the back of theFile Size: KB. The coal industry in the United States—encompassing coal mining, processing, and transportation—is a relatively small but vitally important component of the nation’s provides nearly a quarter of all energy supplies in the United States, with most of this coal used to generate more than half of the nation’s electricity.

Coal is the most abundant fossil fuel on Earth. Its predominant use has always been for producing heat energy. It was the basic energy source that fueled the Industrial Revolution of the 18th and 19th centuries, and the industrial growth of that era in turn supported the large-scale exploitation of coal deposits.

Since the midth century, coal has yielded its place to petroleum and. With the increasing mining depth of coal mines, geologic hazards have become the main source of accidents.

For this reason, coal seam prediction requires more assessment parameters, such as the degree of anisotropy, V P / V S value, and elastic modulus.

These parameters are difficult to determine using only the by: Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the s, has been widely used to generate electricity.

Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine is a pit.

Subsidence over abandoned coal mines is a potential hazard for an estima people and 5, houses along the Front Range Urban Corridor ( figures). Where Coal and Coal Mines Occur. Coal deposits are located in eight geologic basins in the eastern and western portions of Colorado.

The coal is found as layers within sedimentary rocks. ri / geologic factors in predicting coal mine roof-rock stability in the upper kittanning coalbed, somerset county, pennsylvania, pb, $ 48 ri / fluorine and uranium in phosphate rock processing and waste materials, pb, $ 7 ri / analysis of pillar stability on steeply pitching seam using the finite element method, pb, $.

Humidity: a cyclic effect in coal mine roof stability / ([Washington, D.C.]: Dept. of the Interior, Bureau of Mines, []), by Raymond M. Stateham and Daryl E. Radcliffe (page images at HathiTrust) More items available under narrower terms.Stability of the overburden hangingwall, Gays River Mine, Nova Scotia, Westminer Canada Ltd.

Chandrashekhar, K. and Chugh, Y.P., Three dimensional modeling of a four-way coal mine intersection for analysis of roof-pillar-floor interaction, Proceedings 1 st North American Rock Mechanics Symposium, Austin, pp. Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef or placer deposits form a mineralized package that is of economic interest to the miner.

Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay.