Table 3 Classification of fissure zone after the completion of 3-1 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

Caving fissure zone II

403

1683

0.18

1.2738

0.9943

Caving fissure zone III

960

4878

0.52

1.4111

0.9917

Caving fissure zone IV

1411

10,449

1.11

1.5577

0.9927

Vertical breaking fissure zone III

301

1447

0.15

1.2405

0.9938

Vertical breaking fissure zone IV

1865

14,697

1.57

1.5310

0.9951

Vertical breaking fissure zone V

185

648

0.07

1.1515

0.9954

Vertical breaking fissure zone VI

293

1662

0.18

1.2194

0.9945

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