An Analysis of Flexural Strength and Crack Width for Fiber-Reinforced Shotcrete Used in Weak Rock Mines

Details

• Personal Author:
  Caceres, Cristian ; Clark C ; Martin L ; Pakalnis, Rimas T. ; Roworth M ; Seymour B ; Stepan M
• Description:
  The National Institute for Occupational Safety and Health (NIOSH), Office of Mine Safety and Health, Ground Control Engineering Branch is investigating the use of shotcrete in weak rock mass mines with the objective of reducing fatalities and injuries resulting from rock fall accidents. When shotcrete is used as part of a multielement ground support system, there is a need to know the support characteristics that the shotcrete contributes to the overall system. To quantify the support provided by the shotcrete, flexural strength tests were conducted with two common, commercially available fiber-reinforced shotcrete (FRS) mixes using the round determinant panel (RDP) test method, ASTM C 1550. A portable RDP test machine developed by NIOSH researchers was used to determine the peak flexural load and residual load capacity for a steel FRS and a synthetic poly FRS that were sprayed using dry mix procedures and equipment. Besides the flexural strength and loading behavior determined from these tests, a method was also developed for measuring the width of cracks exposed on the underside of a shotcrete panel during a RDP test and relating these measurements to residual load values. Quantifying the peak flexural load and residual loads of a shotcrete mix through on site testing at a mine and visually assessing the loading cycle and load-carrying capability of the shotcrete applied to underground workings will improve mine safety by providing a better assessment of the stability of shotcrete supported entries. [Description provided by NIOSH]
• Subjects:
  Accident Prevention Accidents Mining Occupational Health Risk Assessment Safety Safety Management
• Keywords:
  Accident-prevention Author Keywords: Shotcrete Ground-control Ground-stability Ground Control Injuries Injury-prevention Mining-industry Risk-analysis Rock-falls Round Panel Tests Safety-engineering Safety-measures Safety-research Underground-mining

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• Series:
  Mining Publications
• ISSN:
  1075-8623
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 10 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OMSHR - Office of Mine Safety and Health Research
• Topic:
  Workplace Safety & Health
• Location:
  North America
• NIOSHTIC Number:
  nn:20038048
• Citation:
  Trans Soc Min Metall Explor TP-09-062, 2011 Jan; 328:542-549
• Federal Fiscal Year:
  2011
• 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-512:49667193be4bdf410afef8d442e25734f904f037d451230a8afec309205a906463674bbc2d8916a776c9b4aa52973767ba32b7def80b8bb81b87cd3a2e48710d
• Download URL:
  https://stacks.cdc.gov/view/cdc/227290/cdc_227290_DS1.pdf
• File Type:
  [PDF - 2.24 MB ]