Ground Response to High Horizontal Stresses During Longwall Retreat and Its Implications for Longwall Headgate Support

Details

• Personal Author:
  Esterhuizen E ; Gearhart D ; Su D ; Tulu B ; Van Dyke M ; Zhang P
• Description:
  Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the longwall headgate and the requirements for supplemental roof support. In this study, a longwall headgate under high horizontal stress was instrumented to monitor stress change in the pillars, deformations in the roof, and load in the cable bolts. The conditions in the headgate were monitored for about six months as the longwall face passed by the instrumented site. The roof behavior in the headgate near the face was carefully observed during longwall retreat. Numerical modeling was performed to correlate the modeling results with underground observation and instrumentation data and to quantify the effect of high horizontal stress on roof stability in the longwall headgate. This paper discusses roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary. [Description provided by NIOSH]
• Subjects:
  Geology Mining Occupational Health Safety
• Keywords:
  Author Keywords: Longwall Mining Ground-control Ground-stability High Horizontal Stress Horizontal Stress Longwall Headgate Longwall Mining Mining-equipment Mining-industry Monitoring Systems Pillar Mechanics Roof Falls Roof Supports Stress Supplemental Support Underground-mining

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• Series:
  Mining Publications
• ISSN:
  2095-2686
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania ; West Virginia
• 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:
  27-33
• Volume:
  29
• Issue:
  1
• NIOSHTIC Number:
  nn:20054057
• Citation:
  Int J Min Sci Technol 2019 Jan; 29(1):27-33
• Contact Point Address:
  Peter Zhang, NIOSH, Pittsburgh Mining Research Division (PMRD), Pittsburgh, PA 15236, USA
• Email:
  nmb2@cdc.gov
• Federal Fiscal Year:
  2019
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  International Journal of Mining Science and Technology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:054733054664b6e758414be7e222487e9c4fcf3da1aab34aae927254a544acbd5273e7d538c9492b07cbe2e82af1f660332d36657c32b8297e4a3f10d9b46624
• Download URL:
  https://stacks.cdc.gov/view/cdc/227776/cdc_227776_DS1.pdf
• File Type:
  [PDF - 1.83 MB ]