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Mining Publication: Comparison of Seismic Tomography, Strain Relief, and Ultrasonic Velocity Measurements to Evaluate Stress in an Underground Pillar
Keywords: Geologic conditions and events Pillars
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: March 1999
Authors: DF Scott, JM Girard, TJ Williams, DK Denton
Conference Paper - March 1999
Download PDF Document (0.51 MB)
Society for Mining, Metallurgy, and Exploration, Inc. (SME) Annual Meeting (Mar 1-3, 1999; Denver, CO); SME Preprint 99-155
Personnel from the Spokane Research Laboratory, National Institute for Occupational Safety and Health, examined an underground pillar at the Homestake Mine, Lead, SD. Investigations involved strain relief and seismic tomography studies in the mine, and ultrasonic velocity measurements on pillar core in the laboratory. Measured octahedral normal stress was 37 MPa (5,366psi); seismic P-wave velocities averaged 5.2 km/s (17,060 ft/s); and ultrasonic velocities at a pressure of 39.6 MPa (5,750 psi) averaged 6.3 km/s (20,669 ft/s). The difference between in-mine and laboratory velocities is attributed to the attenuation of seismic energy by mine fractures larger and more numerous than those in the samples of core measured in the laboratory. Using these results, researchers hypothesize that pillar rocks have the ability to withstand stress an order of magnitude greater than they currently sustain.
Image of publication Comparison of Seismic Tomography, Strain Relief, and Ultrasonic Velocity Measurements to Evaluate Stress in an Underground PillarConference Paper - March 1999
Download PDF Document (0.51 MB)
Society for Mining, Metallurgy, and Exploration, Inc. (SME) Annual Meeting (Mar 1-3, 1999; Denver, CO); SME Preprint 99-155
See Also
Advance and Relieve Mining: A Method to Mitigate the Effects of High Horizontal Stress on the Mine Roof
Assessment of Stable and Failed Pillars in Underground Limestone Mines
Behavior of a Coal Pillar Prone to Burst in the Southern Appalachian Basin of the United States
Coal Bumps and Odd Dynamic Phenomena - A Numerical Investigation
Effects of Weak Bands on Pillar Stability in Stone Mines: Field Observations and Numerical Model Assessment
Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
Pillar Design Issues for Underground Stone Mines
Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
Three Dimensional Microseismic Monitoring of a Utah Longwall
The Unpredictable Life Cycle of a Coal Pillar
Page last reviewed: June 14, 2016
Page last updated: June 14, 2016
Content source: National Institute for Occupational Safety and Health, Mining Program
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