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Mining Publication: Long-Term Stability of a Backfilled Room-and-Pillar Test section at the Buick Mine, Missouri, USA
Keywords: Missouri Pressure measurement instruments Room and pillar mining
Original creation date: October 2009
Authors: DR Tesarik, JB Seymour, TR Yanske
Peer Reviewed Journal Article - October 2009
Download PDF Document (1.66 MB)
NIOSHTIC2 Number: 20035602
Int J Rock Mech Min Sci 2009 Oct; 46(7):1182-1196
Rock mechanics instruments have been providing data in a backfilled room-and-pillar test section of the Buick Mine near Boss, Missouri, USA, for nearly 16 years. Host rock instruments include borehole extensometers installed in the mine roof and pillars, and biaxial stressmeters used in pillars and abutments. Embedment strain gauges, extensometers, and earth pressure cells were installed in the cemented backfill. The instruments monitored stability of the test section for two years while the pillars were extracted, and 14 years after pillar extraction to monitor long-term stability. Of the transducers that were not mined out when the pillars were extracted, 68% still function. Data from these instruments demonstrate that backfill improves long-term underground safety by supporting the mine roof and maintaining the strength of support pillars. For example, backfill significantly limited the dilation of a remaining support pillar by providing confinement on one side of the pillar. Post-mining stress and strain in the backfill account for 35% and 28% of the total stress and strain that was measured, respectively. Earth pressure cell stress measurements confirmed visual observations that the backfill remained stable. Post-mining stress measurements from the earth pressure cells fit natural log equations as a function of time with r-squared values ranging from 0.76 to 0.98. Natural log equations also described post-mining strain behavior of the backfill with r-squared values ranging from 0.30 to 0.99. Stresses calculated for the backfill by a three-dimensional numerical model of the test area were consistent with those that were measured by earth pressure cells.
Image of publication Long-Term Stability of a Backfilled Room-and-Pillar Test section at the Buick Mine, Missouri, USAPeer Reviewed Journal Article - October 2009
Download PDF Document (1.66 MB)
NIOSHTIC2 Number: 20035602
Int J Rock Mech Min Sci 2009 Oct; 46(7):1182-1196
See Also
Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
Field Observations and Numerical Studies of Horizontal Stress Effects on Roof Stability in U.S. Limestone Mines
Ground Monitoring
Knowledge Management and Transfer for Mine Emergency Response
Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
Pillar Strength and Design Methodology for Stone Mines
Pillar Strength in Underground Stone Mines in the United States
Propagation of UHF Radio Waves in Limestone Room and Pillar Mines
Sorption Investigations of Methane on Coal
Technology News 490 - An Inexpensive Device for Monitoring Explosions in Sealed Areas of Underground Mines
Ventilation Planning Layouts for Large Opening 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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