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Mining Publication: Coal Bumps and Odd Dynamic Phenomena - A Numerical Investigation
Keywords: Bumps Numerical modeling Pillars Support design and selection
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: July 2009
Authors: JK Whyatt, MC Loken
Conference Paper - July 2009
Download PDF Document (0.38 MB)
NIOSHTIC2 Number: 20035837
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; :175-180
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 10 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.
Image of publication Coal Bumps and Odd Dynamic Phenomena - A Numerical InvestigationConference Paper - July 2009
Download PDF Document (0.38 MB)
NIOSHTIC2 Number: 20035837
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; :175-180
See Also
Behavior of a Coal Pillar Prone to Burst in the Southern Appalachian Basin of the United States
Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
Evaluation of the Impact of Standing Support on Ground Behavior in Longwall Tailgates
A Hybrid Statistical-Analytical Method for assessing Violent Failure in U.S. Coal Mines
Investigation of a Rock-Burst Site, Sunshine Mine, Kellogg, Idaho
Investigation of Pillar-Roof Contact Failure in Northern Appalachian Stone Mine Workings
Numerical Modeling for Increased Understanding of the Behavior and Performance of Coal Mine Stoppings
Sizing of Final Stumps for Safer Pillar Extraction
Stability Analysis of a Backfilled Room-and-Pillar Mine
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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