Table 2 Classification of fissure zone after the completion of 2–2 coal seam mining.

From: Research on the dynamic evolution law of fissures in shallow-buried and short-distance coal seam mining in Lijiahao Coal Mine

Fissure zone division

Total fissure length/pixel

Total fissure area/pixel

Percentage of fissure (%)

Fractal dimension

Correlation coefficient

Bed-separated fissure zone

353

1103

0.12

1.2801

0.9971

Caving fissure zone I

574

3124

0.33

1.3159

0.9928

Vertical breaking fissure zone I

169

363

0.04

1.1056

0.9937

Vertical breaking fissure zone II

530

2320

0.25

1.2854

0.9943

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