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Mining Publication: Stability of Underground Openings Adjacent to the Sink Hole at the NIOSH Lake Lynn Research Laboratory
Keywords: Rock mechanics Roof falls Support design and selection
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: February 2003
Authors: DR Dolinar, TE Marshall, TM Barczak, TP Mucho
Conference Paper - February 2003
Download PDF Document (0.23 MB)
NIOSHTIC2 Number: 20023169
2003 SME Annual Meeting, Feb 24-26, Cincinnati, Ohio, preprint 03-154. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2003; :1-7
Over a portion of the older limestone mine workings at the NIOSH Lake Lynn Laboratory, (a mining health and safety research facility), a large sinkhole formed caused in part by the intersection of several tightly spaced joint sets and unusual weather conditions. The anticipated propagation of the associated roof failures threatened to encroach upon a portion of the facility's secondary escapeway. To protect the escapeway, two cribs walls and over 80 cable bolts were installed. In addition, extensometers were installed to monitor roof movement in the escapeway. However, a large roof fall associated with the propagating roof failures in the sinkhole area partially destroyed one crib wall where the adjacent escapeway was not reinforced by cable bolts. Recent roof movement information indicates that this area is still active. Based on these measurements, steps have been taken to stabilize this portion of the escapeway. This paper discusses roof monitoring, the roof movement, the large roof fall, propagation of the roof failures, and the recent support measures undertaken to stabilize the escapeway.
Image of publication Stability of Underground Openings Adjacent to the Sink Hole at the NIOSH Lake Lynn Research LaboratoryConference Paper - February 2003
Download PDF Document (0.23 MB)
NIOSHTIC2 Number: 20023169
2003 SME Annual Meeting, Feb 24-26, Cincinnati, Ohio, preprint 03-154. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2003; :1-7
See Also
Creep Along Weak Planes in Roof and How It Affects Stability
Development and Application of the Coal Mine Roof Rating (CMRR)
Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
The Introduction of Roof Bolting to U.S. Underground Coal Mines (1948-1960): A Cautionary Tale
Mistakes, Misconceptions, and Key Points Regarding Secondary Roof Support Systems
Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Performance Characteristics for Welded Wire Screen Used for Surface Control in Underground Coal Mines
Preventing Falls of Ground in Coal Mines With Exceptionally Low-Strength Roof: Two Case Studies
Preventing Injuries Caused by Unrecognized Stone Mine Roof Beam Failures With a Pro-Active Roof Control Plan
Page last reviewed: June 8, 2016
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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