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

Details

• Personal Author:
  Khademian Z ; Sears M
• Description:
  According to the 2010-2019 Mine Safety and Health Administration (MSHA) accident report database, 91% of reported ground control accidents in US longwall mines were caused by roof instability. Gateroads are subjected 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 US longwall coal mines, the design of efficient roof support becomes challenging. In previous work, the bonded block modeling (BBM) of roof by UDEC was validated against field extensometer measurements in a longwall entry roof at a 180-m depth of cover. The BBM was shown 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. Results demonstrate 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:
  Mining Occupational Health Safety
• Keywords:
  Author Keywords: Entry Roof Stability Bonded Block Models Ground Control Longwall Mine Longwall Mining Mining Industry Roof-support Interaction Roof Supports Roof Support Systems Trigons
• Series:
  Mining Publications
• ISSN:
  2524-3462
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  41
• Issue:
  2
• NIOSHTIC Number:
  nn:20069306
• Citation:
  Min Metall Explor 2024 Apr; 41(2):695-705
• Contact Point Address:
  Zoheir Khademian, Pittsburgh Mining Research Division, CDC NIOSH, Pittsburgh, PA
• Email:
  opv9@cdc.gov
• Federal Fiscal Year:
  2024
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  Mining, Metallurgy & Exploration
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:22b5b9c980a65601cb7e49a97f71277fcb84a01ee4af43acd2b76ab36368f13adb60489970b04bc94a1f7e46132891c7da3045d2e141f00c3fca7e67647296b3
• Download URL:
  https://stacks.cdc.gov/view/cdc/215694/cdc_215694_DS1.pdf
• File Type:
  [PDF - 3.37 MB ]