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Advances in Civil Engineering
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2024
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Article
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Tab 4
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Research Article
Goaf Site Stability Detection in the Overlap Area of Coal Mining Subsidence and Urban Construction
Table 4
Evaluation criteria for site stability of goaf by longwall mining based on surface subsidence observation values.
Stability levels
Surface subsidence (mm)
1 month
3 months
6 months
12 months
Stable
≤5
≤15
≤30
≤60
Basically stable
5–10
15–30
30–60
60–120
Understable
10–30
30–60
60–120
120–240
Unstable
≥30
≥60
≥120
≥240