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Moisture-Induced Swelling of Illinois Mine Roof Shales: A Visualized Method



Details

  • Personal Author:
  • Description:
    Weak shale roof falls have long been the main cause for fatalities in underground coal mines. Moisture-induced swelling is one of the root causes for the degradation of roof shales. In this study, slake durability tests are conducted on shale samples collected from Illinois basin coal mines, and different levels of durability are analyzed according to Gamble slake durability classification. There are two main mechanisms influencing the shape of retained fragments after two cycles of wetting and drying: mechanical abrasion and swelling pressure. A prototype optically based shale swelling apparatus is designed and manufactured for the shale free-swelling measurement. The experimental results suggest that swelling pressure tends to deteriorate shale laminations. Moistureinduced swelling of the No. 6 roof shale from Bear Run Mine was measured under I 00% relative humidity condition. The measured swelling strain normal to beddings is - 5 to 7 times greater than the swelling strain parallel to beddings. This suggests that interlayer expansion plays a key role in moisture-induced swelling. Cracks induced by swelling pressure tend to occur along the bedding plane and lead to shale deterioration. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISBN:
    9780873354561
  • Publisher:
    Society for Mining, Metallurgy & Exploration
  • Document Type:
    Text
  • Funding:
    Contract
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    182-189
  • NIOSHTIC Number:
    nn:20050426
  • Citation:
    Proceedings of the 36th International Conference on Ground Control in Mining, July 25-27, 2017, Morgantown, West Virginia. Mishra B, Lawson H, Murphy M, Perry K, eds. Englewood, CO: Society for Mining, Metallurgy & Exploration, 2017 Jul; :182-189
  • Editor(s):
    Mishra B; Lawson H; Murphy M; Perry K
  • Federal Fiscal Year:
    2017
  • Performing Organization:
    Penn State University
  • Peer Reviewed:
    False
  • Start Date:
    20160901
  • Source Full Name:
    Proceedings of the 36th International Conference on Ground Control in Mining, July 25-27, 2017, Morgantown, West Virginia
  • End Date:
    20200831
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:0a887fcb5c31f58e8d44964895184cdcb267b6bdf917483af9acd1c37aa38aa7164c3d151006023c06aa6462a4bb13016a18f72256b88d1b2cfe4c417a873e3b
  • Download URL:
  • File Type:
    Filetype[PDF - 1.30 MB ]
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