Coal Bumps and Odd Dynamic Phenomena – a Numerical Investigation

Details

• Personal Author:
  Loken MC ; Whyatt, Jeffrey K.
• Description:
  The Crandall Canyon accident investigation included an interesting and unexplained observation by rescuers that the "barrier rib had shifted northward as a unit, as much as lO feet." This is not the first mention of such a movement, although such reports are rare. Historical accounts describe unusual movement and displacement of intact coal, cribs and timbers. Two movements of particular interest are the creation of gaps above coal pillars and falling of standing support elements without apparent damage. A dynamic boundary element program was used to explore movements induced by slip on geologic features removed from the affected panel. While the resulting models are much too simple to fully replicate these observations, they do show that the types of phenomena observed are possible. They can also provide insight into the types of motions that ground support elements are subjected to during large bump events. This was demonstrated for the case of a large bump in a Book Cliffs coal mine. Seismic information suggested the source mechanism to be normal slip on a fault. A model of that source showed initial dilation of the panel followed by dynamic compression and rebound - consistent with underground observations. The initial dilation is important as it may allow slender standing support to shift or fall. [Description provided by NIOSH]
• Subjects:
  Accidents, Occupational Coal Coal Mining Mining Occupational Health Risk Assessment Safety Safety Management Workplace
• Keywords:
  Accident-analysis Accident-potential Coal-mining Coal-workers Ground-control Ground-stability Mine-shafts Mining-industry Risk-analysis Rock-bursts Room-and-pillar-mining Safety-measures Structural-analysis Underground-mining Work-environment

  More +
• Series:
  Mining Publications
• ISBN:
  9780978938338
• Publisher:
  West Virginia University
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Minnesota ; OSHA Region 10 ; OSHA Region 3 ; OSHA Region 5 ; Washington ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SRL - Spokane Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  175-180
• NIOSHTIC Number:
  nn:20035837
• Citation:
  Proceedings of the 28th International Conference on Ground Control in Mining, July 28-30, 2009, Morgantown, West Virginia. Peng SS, Barczak T, Mark C, Tadolini S, Finfinger G, Heasley K, Luo Y, eds. Morgantown, WV: West Virginia University, 2009 Jul; :175-180
• Editor(s):
  Peng SS; Barczak T; Mark C; Tadolini S; Finfinger G; Heasley K; Luo Y
• Federal Fiscal Year:
  2009
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  Proceedings of the 28th International Conference on Ground Control in Mining, July 28-30, 2009, Morgantown, West Virginia
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:f967f018efee3275a0ba80f15d9bd5a2c3bbd2cbcc46b939d0627194fd6bfb74cb5aac1cbac6ed9710ce4d7080e5a7551cc869a1ba635c143e720a568a61905d
• Download URL:
  https://stacks.cdc.gov/view/cdc/227122/cdc_227122_DS1.pdf
• File Type:
  [PDF - 1015.04 KB ]