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Geofluids
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2022
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Article
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Tab 6
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Research Article
Assessment of Risk Tendency of Coal Bursting Pressure in Deep Outburst Seam
Table 6
Structural classification of coal and rock.
Evaluation index
Classification
Standard
Scale
Coal and rock structure
I
,
fragile floor
0
II
,
harder floor
2
III
,
hard floor
4