Effect of Discontinuity Dip Direction on Hard Rock Pillar Strength

Details

• Personal Author:
  Esterhuizen, Gabriel S. ; Jessu KV ; Kostecki TR ; Spearing AJS
• Description:
  Discontinuities are geologic occurrences in rock and when present within a pillar, reduce the strength of the pillar. Empirical formulas that are commonly used to determine pillar strength do not explicitly take into account the presence of discontinuities and thus can overestimate the pillar strength. The effect of discontinuities on the strength of pillars has been investigated using numerical models, but in these models the discontinuity strike was parallel with the pillar faces. In this study, fully three-dimensional hard rock pillars were simulated using numerical modelling to understand the effect of the discontinuity dip direction on square and rectangular hard rock pillars. Based upon the results, recommendations to assess a pillar's strength in the presence of a discontinuity are discussed. [Description provided by NIOSH]
• Subjects:
  Geology Mining Occupational Health Safety
• Keywords:
  Author Keywords: Hard Rock Pillar Coal Mines Discontinuity Models Pillar Design Pillar Mechanics Rectangular Pillars Rock Mechanics Underground Mining
• Series:
  Mining Publications
• ISSN:
  1075-8623
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Illinois ; OSHA Region 3 ; OSHA Region 5 ; Pennsylvania
• 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:
  25-30
• Volume:
  344
• NIOSHTIC Number:
  nn:20055462
• Citation:
  Trans Soc Min Metall Explor 2019 Jan; 344:25-30
• Federal Fiscal Year:
  2019
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  Transactions of the Society for Mining, Metallurgy, and Exploration
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:6f5982a0271e6fc4993e61514031f558f7950fcfbdb7d2943b39cd89103e70c9fa3c37a7133d8b078a280cd0317bf9834391351d85b1035ffa3f6a862e43b3c8
• Download URL:
  https://stacks.cdc.gov/view/cdc/227841/cdc_227841_DS1.pdf
• File Type:
  [PDF - 648.64 KB ]