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Mining Publication: Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
Keywords: Horizontal stress Limestone Room and pillar mining Stone mining Support design and selection
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: January 2005
Authors: GS Esterhuizen, AT Iannacchione
Conference Paper - January 2005
Download PDF Document (0.98 MB)
NIOSHTIC2 Number: 20028123
Proceedings of the 40th U.S. Rock Mechanics Symposium, Anchorage, AK, June 25-29, 2005. Alexandria, VA: American Rock Mechanics Association, 2005 Jun; :1-8
Underground limestone mines typically use the room-and-pillar method of mining in the generally flat-lying limestone formations. In some cases, the dip may exceed 5 deg, which can result in unique roof instability problems. Stability may be further exacerbated by the presence of horizontal tectonic stresses. Field studies and numerical model analyses are combined to assess the effect of the dip in various stress conditions. The results showed that where the horizontal tectonic stresses are sufficient to cause intact rock failure, increasing dip results in increased failure potential. The effect of the dip is greater when the maximum horizontal stress is parallel to the dip. Two case studies are presented and evaluated against the findings of stress analysis results. The study showed that the empirical rules of orienting headings parallel to the maximum stress are generally applicable to dipping excavations, except when mining in the up-dip direction. The importance of accurately determining the orientation of the maximum horizontal stress is emphasized because the window of favorable orientations relative to the stress is small.
Image of publication Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine WorkingsConference Paper - January 2005
Download PDF Document (0.98 MB)
NIOSHTIC2 Number: 20028123
Proceedings of the 40th U.S. Rock Mechanics Symposium, Anchorage, AK, June 25-29, 2005. Alexandria, VA: American Rock Mechanics Association, 2005 Jun; :1-8
See Also
Controlling Roof Beam Failures From High Horizontal Stresses in Underground Stone Mines
Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
Investigation of Pillar-Roof Contact Failure in Northern Appalachian Stone Mine Workings
Pillar and Roof Span Design Guidelines for Underground Stone Mines
Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
Pillar Strength and Design Methodology for Stone Mines
Propagation of UHF Radio Waves in Limestone Room and Pillar Mines
Roof Span Design for Underground Stone Mines
Roof Stability Issues in Underground Limestone Mines in the United States
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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