Surface Subsidence
nounPronunciation: /ˈsɜrfɪs səbˈsɪdəns/
The gradual or sudden sinking of land surface above abandoned underground mine workings due to collapse of unsupported voids and strata. This creates surface depressions, ground instability, and structural hazards requiring engineering remediation.
Plain English
Land surface sinking above empty mine tunnels and chambers, creating dangerous depressions and unstable ground.
Etymology & History
Usage
"The reclamation team used grout injection to prevent surface subsidence above the abandoned coal mine workings."
Style guide notes: Avoid confusing with natural subsidence; specify mining-related subsidence in technical writing.
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Related Terms
Frequently Asked Questions
What signs indicate surface subsidence from mining?
Look for sinkholes, ground depressions, tilted structures, cracked pavement, and displaced utility lines over mine areas.
How is surface subsidence prevented during reclamation?
Methods include grout injection into voids, pillar reinforcement, backfilling, and surface monitoring with ground displacement sensors.
Why Test Candidates on This?
Surface subsidence assessment is critical for hazard identification and determining stabilization requirements in reclamation.
Required skill level: Mid