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Mining Publication: Roof Span Design for Underground Stone Mines
Keywords: Pillar design Roof quality Span design Stone mining Support design and selection 
 Underground mining
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: July 2010
Authors: GS Esterhuizen, DR Dolinar, JL Ellenberger
Conference Paper - July 2010
Download PDF Document (0.84 MB)
NIOSHTIC2 Number: 20037620
Proceedings of the 29th International Conference on Ground Control in Mining, Morgantown, West Virginia, July 27-29, 2010. Barczak T, ed., Morgantown, WV: West Virginia University, 2010; :318-324
Underground stone mines in the United States use the room-and- pillar method of mining. The stability of the roof between pillars determines the mining dimensions and size of equipment that can be used. The findings of a survey of roof span stability issues and design practices are presented, and the observed factors contributing to roof instability are discussed. Identified stability issues are evaluated, such as maximum roof span, horizontal stress, and roof beam stability. The results of field observations, roof monitoring, and numerical analyses are used in the evaluation. The importance of the first roof beam thickness and its impact on roof stability and support requirements is presented. An evaluation of the current experience with stone mine roof spans relative to international experience is presented. A step-by-step design procedure is suggested which emphasizes the need to collect adequate geotechnical data, understand the immediate roof stability, select a mining direction, and meet support requirements.
Image of publication Roof Span Design for Underground Stone MinesConference Paper - July 2010
Download PDF Document (0.84 MB)
NIOSHTIC2 Number: 20037620
Proceedings of the 29th International Conference on Ground Control in Mining, Morgantown, West Virginia, July 27-29, 2010. Barczak T, ed., Morgantown, WV: West Virginia University, 2010; :318-324
See Also
ARBS - Analysis of Roof Bolt Systems - 2.5.02
A Computer Software Program that Estimates Air Quantity Requirements in Large Opening Stone Mines
Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
Pillar and Roof Span Design Guidelines for Underground Stone Mines
Pillar and Roof Span Design in Stone Mines
Pillar Design Issues for Underground Stone Mines
Pillar Strength and Design Methodology for Stone Mines
Preventing Injuries Caused by Unrecognized Stone Mine Roof Beam Failures With a Pro-Active Roof Control Plan
Roof Stability Issues in Underground Limestone Mines in the United States
Technology News 481 - Update: Roof Monitoring Safety System for Underground Stone Mines
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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