In situ stress measurements near the Ross shaft pillar, Homestake Mine, South Dakota

Details

• Personal Author:
  Jenkins, F. Michael ; Johnson, Jeffrey C. ; Pariseau, W. G. ; Scott, Douglas F.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "In situ stresses are important input data for the design of safe, stable stope layouts and extraction sequences. However, it is commonly assumed that normal and shear stress gradients in a stress field are negligible and, consequently, that stresses are uniform throughout the region of analysis. To evaluate these assumptions and to provide input data for an analysis of a shaft pillar mining plan, in situ stresses were measured at the Homestake Mine, Lead, South Dakota, using overcoring on hollow inclusion cells and borehole deformation gauges. These measurements were used with conventional least squares, best fit data reduction schemes. The results showed that normal stresses within the shaft pillar were less than, but comparable to, those estimated from finite-element modeling. Shear stresses were an order of magnitude less than normal stresses and varied considerably from site to site. Possible causes of this variability include effects of scale, elastic moduli, anisotropy, and axial strain. Because of the variability, it is not possible to determine the magnitude of horizontal stress gradients." - NIOSHTIC-2
  
  NIOSH no. 10003215
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  South Dakota ; South Dakota -- Lead Region -- Homestake Mine (SD) ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  17 numbered pages
• NIOSHTIC Number:
  nn:10003215
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4dc60161d7ba697ef68d22721125d0f7d968adb60e314a64b4af7243118defbdfe216e19c4ff2be514b2a3e76c79654e252f7435b96424869d0a00ab43ec8bff
• Download URL:
  https://stacks.cdc.gov/view/cdc/9551/cdc_9551_DS1.pdf
• File Type:
  [PDF - 2.45 MB ]