The Effect of Standing Support Stiffness on Primary and Secondary Bolting Systems

Details

• Personal Author:
  Barczak, Thomas M. ; Tadolini, Stephen C. ; Zhang Y
• Description:
  Standing crib supports have been applied in underground mining programs to resist large roof movements and sustain high loads. The strength and deformation capability of these systems has been documented under both lab and field conditions. The parameter that has not been examined and is not well understood is the effect that a crib or other types of standing support has on the primary and secondary bolting systems. A crib support system with low system stiffness may allow large amounts of closure and deformation and cause the bolting systems to yield or even fail. Conversely, cribs or standing support that are too stiff may experience brittle or buckling failures, negating the advantage of the intrinsic supports previously installed. Using a combination of field measurements and three-dimensional finite-element modeling techniques, the relationship between system stiffness and the subsequent performance of the installed bolting system is evaluated. Additionally, a simple method for calculating the combined system stiffness for standing supports when using materials with different strengths such as steel, concrete, wood, etc., is presented. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Engineering Mining Occupational Health Safety
• Keywords:
  Coal-mining Control-technology Engineering-controls Ground-control Longwall-mining Mine-roof-supports Numerical-modeling Underground-mining
• Series:
  Mining Publications
• ISBN:
  0939084569
• Publisher:
  West Virginia University
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  OSHA Region 3 ; Pennsylvania ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRL - Pittsburgh Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  300-307
• NIOSHTIC Number:
  nn:20023435
• Citation:
  Proceedings of the 22nd International Conference on Ground Control in Mining, August 5-7, 2003, Morgantown, West Virginia. Peng SS, Mark C, Khair AW, Heasley KA, eds., Morgantown, WV: West Virginia University, 2003 Aug; :300-307
• Editor(s):
  Peng SS; Mark C; Khair AW; Heasley KA
• Federal Fiscal Year:
  2003
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9e2e7f41dd506e4757f18dca544fd33aae598320533b0f5e5a9e8453a7e6e52579f2d76521f3bd2b5dc9123ad8103ce9563f4b641e5b80da679b68a46935102c
• Download URL:
  https://stacks.cdc.gov/view/cdc/220687/cdc_220687_DS1.pdf
• File Type:
  [PDF - 1.11 MB ]