Crown Pillar Monitoring
nounPronunciation: /kraʊn ˈpɪlər ˈmɑːnɪtərɪŋ/
The systematic inspection and measurement of the uppermost intact rock layer separating underground voids from the surface, tracking structural integrity, stress redistribution, and subsidence risk. Monitoring employs surveying, visual assessment, stress monitoring instruments, and periodicity varies based on mine geometry and closure timeline.
Plain English
Ongoing inspection of the rock layer protecting the surface from collapsing into underground mine voids.
Etymology & History
Usage
"Crown pillar monitoring data indicated minor subsidence rates acceptable under the closure certificate conditions."
Style guide notes: Clearly identify monitoring location, interval, and methods; include baseline measurements for comparison.
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Contrasted with
Related Terms
Frequently Asked Questions
How frequently should crown pillars be monitored?
Monitoring frequency depends on mine depth, pillar thickness, and closure conditions, typically annually to every five years.
What methods detect crown pillar failure risks?
Surveying for elevation changes, visual mapping of cracks, stress measurement devices, and geotechnical modeling identify failure precursors.
Why Test Candidates on This?
Essential for closure engineers responsible for long-term subsidence liability and public safety assurance.
Required skill level: Mid