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Contribution of Individual Support Components to Roof Stability in a Longwall Gateroad

Public Domain


Details

  • Personal Author:
  • Description:
    According to the 2010-2019 Mine Safety and Health Administration (MSHA) accident report database, 91% of reported ground control accidents in U.S. longwall mines were caused by roof instability. Gateroads are subject to significant changes in loading conditions from the development to the longwall abutment loading phases. When combined with thinly bedded shale roof, found in many U.S. longwall coal mines, the design of efficient roof support becomes challenging. In previous work, the Bonded Block Method (BBM) modeling of roof by UDEC was validated against field extensometer measurements in a longwall gateroad entry roof at a 180-m depth of cover. The BBM was shown as capable of capturing delamination and buckling of shale roof, one of the main roof instability mechanisms in longwall mines. This paper presents the recent findings on the roof-support interaction using BBM models of the same longwall entry. The effects of cable bolts, roof bolt density, and strap support on potential roof instability are studied. These types of studies are difficult and costly to conduct in an operating mine. Results show how the contribution of bolts, straps, and cable bolts can be quantified using the BBM models. The study demonstrates the potential for BBM numerical models to help understand the complex roof and support system interactions and to assist with optimizing gateroad support systems. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • Series:
    Mining Publications
  • ISBN:
    9781713872368
  • 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:
    1-6
  • NIOSHTIC Number:
    nn:20067864
  • Citation:
    MineXchange: 2023 SME Annual Conference and Expo, February 26-March 1, 2023, Denver, Colorado, preprint 23-042. Englewood, CO: Society for Mining, Metallurgy & Exploration, 2023 Feb; :1-6
  • Federal Fiscal Year:
    2023
  • NORA Priority Area:
    Mining
  • Peer Reviewed:
    False
  • Source Full Name:
    MineXchange: 2023 SME Annual Conference and Expo, February 26-March 1, 2023, Denver, Colorado, preprint 23-042
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:d55921d44bca11d87d59e2215540472d7573ea06b66a0ea2bed9f4e79cd55e76414a1520e9e486fa6a47f5b88ca8e9e6efab9c593903f72756d657dd907b687e
  • Download URL:
  • File Type:
    Filetype[PDF - 843.29 KB ]
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