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Evaluation of Alternative Chain Pillar Designs in a Deep Longwall Mine

Public Domain


Details

  • Personal Author:
  • Description:
    Borehole scoping has been widely used in the U.S. underground coal mines as a method for geologic mapping and stability analysis because it is very useful for identifying rock types, voids, fractures, and formation boundaries through the direct observation of the borehole wall. An image stitching technique was proposed to generate panoramic borehole images from side-view borescopes in a previous study. However, the generation of panoramic borehole images can be affected by the borehole condition because the image stitching process highly depends on the key point detection and matching. The presence of dust and water could have a significant influence on the detection of key points. In this study, the influence of borehole conditions on panoramic borehole images was studied from the success of image stitching and the visibility of geologic features and lithology changes. Borehole videos recorded at different times, when the same borehole was freshly drilled, freshly washed with water and 12 days after washing, were processed with the proposed technique. The comparison of the stitched images shows that the presence of dust has minimal influence on the image stitching process but shows significant negative effects on the visualization of geologic feature and lithology change. In addition, the presence of water can significantly hinder the image stitching process, which in turn helps in identifying lithology change. Borehole scoping aids in identifying and mitigating hazardous conditions in underground mines, and this study provides preliminary inputs into identifying optimum borehole conditions for geologic mapping with panoramic borehole images. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • Series:
    Mining Publications
  • Publisher:
    Society for Mining, Metallurgy & Exploration (SME)
  • Document Type:
    Text
  • Genre:
    Proceedings
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    PMRD - Pittsburgh Mining Research Division
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    1-10
  • NIOSHTIC Number:
    nn:20070853
  • Citation:
    MineXchange: 2025 SME Annual Conference & Expo, February 23-26, 2025, Denver, Coloardo, preprint 25-085. Englewood, CO: Society for Mining, Metallurgy & Exploration, 2025 Feb; :1-10
  • Federal Fiscal Year:
    2025
  • Peer Reviewed:
    False
  • Source Full Name:
    MineXchange: 2025 SME Annual Conference & Expo, February 23-26, 2025, Denver, Coloardo, preprint 25-085
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:5c8d31d2c4650624143f280e302a860707fe811c41bfdc17bb20e5f038f5fea55de3cc568230ef9ef37629ecfb5a2f3122d5b99c038c9bd1fd90687df69d573b
  • Download URL:
  • File Type:
    Filetype[PDF - 745.31 KB ]
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