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Mining Publication: Utilizing the 'Advance and Relieve' Method to Reduce Horizontal Stress Affects on the Mine Roof, A Case Study
Keywords: Barrier pillars Caves Horizontal stress
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: January 2000
Authors: DR Dolinar, TP Mucho, DC Oyler, J Pablic
Conference Paper - January 2000
Download PDF Document (2.05 MB)
NIOSHTIC2 Number: 20020918
Proceedings of the 19th International Conference on Ground Control in Mining, Peng SS, Mark C, eds., Morgantown, WV: West Virginia University, 2000 Jan; :137-148
A room and pillar coal operation in central Pennsylvania was experiencing roof cutters and long running roof falls caused by high horizontal stresses. The roof conditions created hazards for the miners, and caused several production panels to be abandoned prematurely. The mine requested assistance from the National Institute for Occupational Safety and Health (NIOSH) in applying the "advance and relieve" mining to reduce the affects of the horizontal stress during panel development. The "advance and relieve" plan that was developed called for removing a pillar on one side of the panel as it was being advanced, thus creating a cave. The caving then relieved a portion of the horizontal stress across the panel. Because the horizontal stress direction is key to the success of this method, stress mapping as well as mining experience was used to establish the direction of the horizontal stress. Subsequent field measurements provided an estimate of the stress magnitude. Three panels were mined using this technique, and good roof conditions were achieved in all these panels. Instrumentation was used to monitor the stress changes in the roof created by the cave. Stress relief of over 1,000 psi was measured 120 ft from the cave and to depths of 20 ft into the roof. The lateral extent of the stress relief zone across the panels appears to be about 400 to 500 ft. This case history has provided much insight into the practical application of the "advance and relieve" method discussed in this paper.
Image of publication Utilizing the 'Advance and Relieve' Method to Reduce Horizontal Stress Affects on the Mine Roof, A Case StudyConference Paper - January 2000
Download PDF Document (2.05 MB)
NIOSHTIC2 Number: 20020918
Proceedings of the 19th International Conference on Ground Control in Mining, Peng SS, Mark C, eds., Morgantown, WV: West Virginia University, 2000 Jan; :137-148
See Also
Advance and Relieve Mining: A Method to Mitigate the Effects of High Horizontal Stress on the Mine Roof
Controlling Roof Beam Failures From High Horizontal Stresses in Underground Stone Mines
Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
Horizontal Stress
Horizontal Stress and Longwall Headgate Ground Control
Rock Mechanics Study of Lateral Destressing for the Advance-and-Relieve Mining Method
Safer Mine Layouts for Underground Stone Mines Subjected to Excessive Levels of Horizontal Stress
Stress Measurements for Safety Decisions in Longwall Coal
Technology News 516 - ARMPS-HWM: New Software for Sizing Pillars for Highwall Mining
Temporal Imaging of Mine-Induced Stress Change Using Seismic Tomography
Variation of Horizontal Stresses and Strains in Mines in Bedded Deposits in the Eastern and Midwestern 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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