Mining Publication: In Situ Stress at the Lucky Friday Mine (In Four Parts): 2. Analysis of Overcore Measurement From 5300 Level
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Original creation date: July 1995
The U.S. Bureau of Mines conducted an overcore stress measurement on the 5300 level of the Lucky Friday Mine, Mullan, Idaho, to investigate the stress regime around an experimental stope in a rock-burst-prone mine. The result indicated a stress field with unexpected magnitude and orientation [maximum principal stress equals approx. 135 MPa (19,600 psi) oriented S 80 deg W]. An unusual amount of rock-burst activity was encountered during subsequent excavation. A careful review of the overcore data suggested the overcore strain measurements were valid. Moreover, concentrated rock-burst activity suggested that the measured stress field did exist, but was localized and therefore did not represent the far-field in situ stress field.
Authors: JK Whyatt, FM Jenkins, MK Larson
Report of Investigations - July 1995
NIOSHTIC2 Number: 20024016
U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9560. NTIS stock number: PB95-251880, 1995 Jul :1-42
See Also
- 60 Years of Rockbursting in the Coeur D'Alene District of Northern Idaho, USA: Lessons Learned and Remaining Issues
- Analysis of Multiple Seam Stability
- Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
- Dynamic Failure in Deep Coal: Recent Trends and a Path Forward
- Geophysical Methods to Detect Stress in Underground Mines
- In Situ Stress at the Lucky Friday Mine (In Four Parts): 3. Reanalysis of Overcore Measurements from the Star Mine
- In Situ Stress at the Lucky Friday Mine (In Four Parts): 4. Characterization of Mine In Situ Stress Field
- Investigation of a Rock-Burst Site, Sunshine Mine, Kellogg, Idaho
- Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
- Pillar Strength and Design Methodology for Stone Mines
- Rock Mechanics Investigations at the Lucky Friday Mine (In Three Parts): 2. Evaluation of Underhand Backfill Practice for Rock Burst Control
- Role of Fault Slip on Mechanisms of Rock Burst Damage, Lucky Friday Mine, Idaho, USA
- Content source: National Institute for Occupational Safety and Health, Mining Program